2770 lines
88 KiB
JavaScript
2770 lines
88 KiB
JavaScript
// Copyright IBM Corp. 2013,2018. All Rights Reserved.
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// Node module: loopback-datasource-juggler
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// This file is licensed under the MIT License.
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// License text available at https://opensource.org/licenses/MIT
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// Turning on strict for this file breaks lots of test cases;
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// disabling strict for this file
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/* eslint-disable strict */
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/*!
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* Module dependencies
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*/
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const ModelBuilder = require('./model-builder.js').ModelBuilder;
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const ModelDefinition = require('./model-definition.js');
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const RelationDefinition = require('./relation-definition.js');
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const OberserverMixin = require('./observer');
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const jutil = require('./jutil');
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const utils = require('./utils');
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const ModelBaseClass = require('./model.js');
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const DataAccessObject = require('./dao.js');
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const defineScope = require('./scope.js').defineScope;
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const EventEmitter = require('events').EventEmitter;
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const util = require('util');
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const assert = require('assert');
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const async = require('async');
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const traverse = require('traverse');
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const g = require('strong-globalize')();
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const juggler = require('..');
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const deprecated = require('depd')('loopback-datasource-juggler');
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const Transaction = require('loopback-connector').Transaction;
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if (process.env.DEBUG === 'loopback') {
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// For back-compatibility
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process.env.DEBUG = 'loopback:*';
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}
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const debug = require('debug')('loopback:datasource');
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/*!
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* Export public API
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*/
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exports.DataSource = DataSource;
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/*!
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* Helpers
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*/
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const slice = Array.prototype.slice;
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/**
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* LoopBack models can manipulate data via the DataSource object.
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* Attaching a `DataSource` to a `Model` adds instance methods and static methods to the `Model`.
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*
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* Define a data source to persist model data.
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* To create a DataSource programmatically, call `createDataSource()` on the LoopBack object; for example:
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* ```js
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* var oracle = loopback.createDataSource({
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* connector: 'oracle',
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* host: '111.22.333.44',
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* database: 'MYDB',
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* username: 'username',
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* password: 'password'
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* });
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* ```
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*
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* All classes in single dataSource share same the connector type and
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* one database connection.
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*
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* For example, the following creates a DataSource, and waits for a connection callback.
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*
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* ```
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* var dataSource = new DataSource('mysql', { database: 'myapp_test' });
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* dataSource.define(...);
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* dataSource.on('connected', function () {
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* // work with database
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* });
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* ```
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* @class DataSource
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* @param {String} [name] Optional name for datasource.
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* @options {Object} settings Database-specific settings to establish connection (settings depend on specific connector).
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* The table below lists a typical set for a relational database.
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* @property {String} connector Database connector to use. For any supported connector, can be any of:
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*
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* - The connector module from `require(connectorName)`.
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* - The full name of the connector module, such as 'loopback-connector-oracle'.
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* - The short name of the connector module, such as 'oracle'.
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* - A local module under `./connectors/` folder.
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* @property {String} host Database server host name.
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* @property {String} port Database server port number.
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* @property {String} username Database user name.
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* @property {String} password Database password.
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* @property {String} database Name of the database to use.
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* @property {Boolean} debug Display debugging information. Default is false.
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*
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* The constructor allows the following styles:
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*
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* 1. new DataSource(dataSourceName, settings). For example:
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* - new DataSource('myDataSource', {connector: 'memory'});
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* - new DataSource('myDataSource', {name: 'myDataSource', connector: 'memory'});
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* - new DataSource('myDataSource', {name: 'anotherDataSource', connector: 'memory'});
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*
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* 2. new DataSource(settings). For example:
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* - new DataSource({name: 'myDataSource', connector: 'memory'});
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* - new DataSource({connector: 'memory'});
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*
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* 3. new DataSource(connectorModule, settings). For example:
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* - new DataSource(connectorModule, {name: 'myDataSource})
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* - new DataSource(connectorModule)
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*/
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function DataSource(name, settings, modelBuilder) {
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if (!(this instanceof DataSource)) {
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return new DataSource(name, settings);
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}
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// Check if the settings object is passed as the first argument
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if (typeof name === 'object' && settings === undefined) {
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settings = name;
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name = undefined;
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}
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// Check if the first argument is a URL
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if (typeof name === 'string' && name.indexOf('://') !== -1) {
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name = utils.parseSettings(name);
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}
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// Check if the settings is in the form of URL string
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if (typeof settings === 'string' && settings.indexOf('://') !== -1) {
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settings = utils.parseSettings(settings);
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}
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// Shallow-clone the settings so that updates to `ds.settings`
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// do not modify the original object provided via constructor arguments
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if (settings) settings = Object.assign({}, settings);
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// It's possible to provide settings object via the "name" arg too!
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if (typeof name === 'object') name = Object.assign({}, name);
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this.modelBuilder = modelBuilder || new ModelBuilder();
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this.models = this.modelBuilder.models;
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this.definitions = this.modelBuilder.definitions;
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this.juggler = juggler;
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this._queuedInvocations = 0;
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// operation metadata
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// Initialize it before calling setup as the connector might register operations
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this._operations = {};
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this.setup(name, settings);
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this._setupConnector();
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// connector
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const connector = this.connector;
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// DataAccessObject - connector defined or supply the default
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const dao = (connector && connector.DataAccessObject) || this.constructor.DataAccessObject;
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this.DataAccessObject = function() {
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};
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// define DataAccessObject methods
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Object.keys(dao).forEach(function(name) {
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const fn = dao[name];
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this.DataAccessObject[name] = fn;
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if (typeof fn === 'function') {
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this.defineOperation(name, {
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accepts: fn.accepts,
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'returns': fn.returns,
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http: fn.http,
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remoteEnabled: fn.shared ? true : false,
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scope: this.DataAccessObject,
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fnName: name,
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});
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}
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}.bind(this));
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// define DataAccessObject.prototype methods
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Object.keys(dao.prototype || []).forEach(function(name) {
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const fn = dao.prototype[name];
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this.DataAccessObject.prototype[name] = fn;
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if (typeof fn === 'function') {
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this.defineOperation(name, {
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prototype: true,
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accepts: fn.accepts,
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'returns': fn.returns,
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http: fn.http,
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remoteEnabled: fn.shared ? true : false,
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scope: this.DataAccessObject.prototype,
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fnName: name,
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});
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}
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}.bind(this));
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}
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util.inherits(DataSource, EventEmitter);
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// allow child classes to supply a data access object
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DataSource.DataAccessObject = DataAccessObject;
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/**
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* Global maximum number of event listeners
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*/
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DataSource.DEFAULT_MAX_OFFLINE_REQUESTS = 16;
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/**
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* Set up the connector instance for backward compatibility with JugglingDB schema/adapter
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* @private
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*/
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DataSource.prototype._setupConnector = function() {
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this.connector = this.connector || this.adapter; // The legacy JugglingDB adapter will set up `adapter` property
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this.adapter = this.connector; // Keep the adapter as an alias to connector
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if (this.connector) {
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if (!this.connector.dataSource) {
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// Set up the dataSource if the connector doesn't do so
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this.connector.dataSource = this;
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}
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const dataSource = this;
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// Set max listeners to a default/configured value
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dataSource.setMaxListeners(dataSource.getMaxOfflineRequests());
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this.connector.log = function(query, start) {
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dataSource.log(query, start);
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};
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this.connector.logger = function(query) {
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const t1 = Date.now();
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const log = this.log;
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return function(q) {
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log(q || query, t1);
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};
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};
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// Configure the connector instance to mix in observer functions
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jutil.mixin(this.connector, OberserverMixin);
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}
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};
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// List possible connector module names
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function connectorModuleNames(name) {
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const names = []; // Check the name as is
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if (!name.match(/^\//)) {
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names.push('./connectors/' + name); // Check built-in connectors
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if (name.indexOf('loopback-connector-') !== 0) {
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names.push('loopback-connector-' + name); // Try loopback-connector-<name>
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}
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}
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// Only try the short name if the connector is not from StrongLoop
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if (['mongodb', 'oracle', 'mysql', 'postgresql', 'mssql', 'rest', 'soap', 'db2', 'cloudant']
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.indexOf(name) === -1) {
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names.push(name);
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}
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return names;
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}
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// testable with DI
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function tryModules(names, loader) {
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let mod;
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loader = loader || require;
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for (let m = 0; m < names.length; m++) {
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try {
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mod = loader(names[m]);
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} catch (e) {
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const notFound = e.code === 'MODULE_NOT_FOUND' &&
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e.message && e.message.indexOf(names[m]) > 0;
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if (notFound) {
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debug('Module %s not found, will try another candidate.', names[m]);
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continue;
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}
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debug('Cannot load connector %s: %s', names[m], e.stack || e);
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throw e;
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}
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if (mod) {
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break;
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}
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}
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return mod;
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}
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/*!
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* Resolve a connector by name
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* @param name The connector name
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* @returns {*}
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* @private
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*/
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DataSource._resolveConnector = function(name, loader) {
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const names = connectorModuleNames(name);
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const connector = tryModules(names, loader);
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let error = null;
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if (!connector) {
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error = g.f('\nWARNING: {{LoopBack}} connector "%s" is not installed ' +
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'as any of the following modules:\n\n %s\n\nTo fix, run:\n\n {{npm install %s --save}}\n',
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name, names.join('\n'), names[names.length - 1]);
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}
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return {
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connector: connector,
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error: error,
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};
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};
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/**
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* Connect to the data source.
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* If no callback is provided, it will return a Promise.
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* Emits the 'connect' event.
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* @param callback
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* @returns {Promise}
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* @emits connected
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*/
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DataSource.prototype.connect = function(callback) {
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callback = callback || utils.createPromiseCallback();
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const self = this;
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if (this.connected) {
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// The data source is already connected, return immediately
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process.nextTick(callback);
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return callback.promise;
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}
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if (typeof this.connector.connect !== 'function') {
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// Connector doesn't have the connect function
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// Assume no connect is needed
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self.connected = true;
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self.connecting = false;
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process.nextTick(function() {
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self.emit('connected');
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callback();
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});
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return callback.promise;
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}
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// Queue the callback
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this.pendingConnectCallbacks = this.pendingConnectCallbacks || [];
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this.pendingConnectCallbacks.push(callback);
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// The connect is already in progress
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if (this.connecting) return callback.promise;
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this.connector.connect(function(err, result) {
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self.connecting = false;
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if (!err) self.connected = true;
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const cbs = self.pendingConnectCallbacks;
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self.pendingConnectCallbacks = [];
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if (!err) {
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self.emit('connected');
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} else {
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self.emit('error', err);
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}
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// Invoke all pending callbacks
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async.each(cbs, function(cb, done) {
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try {
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cb(err);
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} catch (e) {
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// Ignore error to make sure all callbacks are invoked
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debug('Uncaught error raised by connect callback function: ', e);
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} finally {
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done();
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}
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}, function(err) {
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if (err) throw err; // It should not happen
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});
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});
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// Set connecting flag to be `true` so that the connector knows there is
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// a connect in progress. The change of `connecting` should happen immediately
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// after the connect request is sent
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this.connecting = true;
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return callback.promise;
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};
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/**
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* Set up the data source. The following styles are supported:
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* ```js
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* ds.setup('myDataSource', {connector: 'memory'}); // ds.name -> 'myDataSource'
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* ds.setup('myDataSource', {name: 'myDataSource', connector: 'memory'}); // ds.name -> 'myDataSource'
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* ds.setup('myDataSource', {name: 'anotherDataSource', connector: 'memory'}); // ds.name -> 'myDataSource' and a warning will be issued
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* ds.setup({name: 'myDataSource', connector: 'memory'}); // ds.name -> 'myDataSource'
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* ds.setup({connector: 'memory'}); // ds.name -> 'memory'
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* ```
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* @param {String} dsName The name of the datasource. If not set, use
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* `settings.name`
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* @param {Object} settings The settings
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* @returns {*}
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* @private
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*/
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DataSource.prototype.setup = function(dsName, settings) {
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const dataSource = this;
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let connector;
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// First argument is an `object`
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if (dsName && typeof dsName === 'object') {
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if (settings === undefined) {
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// setup({name: 'myDataSource', connector: 'memory'})
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settings = dsName;
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dsName = undefined;
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} else {
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// setup(connector, {name: 'myDataSource', host: 'localhost'})
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connector = dsName;
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dsName = undefined;
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}
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}
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if (typeof dsName !== 'string') {
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dsName = undefined;
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}
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if (typeof settings === 'object') {
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if (settings.initialize) {
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// Settings is the resolved connector instance
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connector = settings;
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// Set settings to undefined to avoid confusion
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settings = undefined;
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} else if (settings.connector) {
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// Use `connector`
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connector = settings.connector;
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} else if (settings.adapter) {
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// `adapter` as alias for `connector`
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connector = settings.adapter;
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}
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}
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// just save everything we get
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this.settings = settings || {};
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this.settings.debug = this.settings.debug || debug.enabled;
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if (this.settings.debug) {
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debug('Settings: %j', this.settings);
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}
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if (typeof settings === 'object' && typeof settings.name === 'string' &&
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typeof dsName === 'string' && dsName !== settings.name) {
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// setup('myDataSource', {name: 'anotherDataSource', connector: 'memory'});
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// ds.name -> 'myDataSource' and a warning will be issued
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console.warn(
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'A datasource is created with name %j, which is different from the name in settings (%j). ' +
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'Please adjust your configuration to ensure these names match.',
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dsName, settings.name,
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);
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}
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// Disconnected by default
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this.connected = false;
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this.connecting = false;
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this.initialized = false;
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this.name = dsName || (typeof this.settings.name === 'string' && this.settings.name);
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let connectorName;
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if (typeof connector === 'string') {
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// Connector needs to be resolved by name
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connectorName = connector;
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connector = undefined;
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} else if ((typeof connector === 'object') && connector) {
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connectorName = connector.name;
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} else {
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connectorName = dsName;
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}
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if (!this.name) {
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// Fall back to connector name
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this.name = connectorName;
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}
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if ((!connector) && connectorName) {
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// The connector has not been resolved
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const result = DataSource._resolveConnector(connectorName);
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connector = result.connector;
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if (!connector) {
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console.error(result.error);
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this.emit('error', new Error(result.error));
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return;
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}
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}
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if (connector) {
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const postInit = function postInit(err, result) {
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this._setupConnector();
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// we have an connector now?
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if (!this.connector) {
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throw new Error(g.f('Connector is not defined correctly: ' +
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'it should create `{{connector}}` member of dataSource'));
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}
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if (!err) {
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this.initialized = true;
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this.emit('initialized');
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}
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debug('Connector is initialized for dataSource %s', this.name);
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// If `result` is set to `false` explicitly, the connection will be
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// lazily established
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if (!this.settings.lazyConnect) {
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this.connected = (!err) && (result !== false); // Connected now
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}
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if (this.connected) {
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debug('DataSource %s is now connected to %s', this.name, this.connector.name);
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this.emit('connected');
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} else if (err) {
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// The connection fails, let's report it and hope it will be recovered in the next call
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// Reset the connecting to `false`
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this.connecting = false;
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if (this._queuedInvocations) {
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// Another operation is already waiting for connect() result,
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// let them handle the connection error.
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debug('Connection fails: %s\nIt will be retried for the next request.', err);
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} else {
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g.error('Connection fails: %s\nIt will be retried for the next request.', err);
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this.emit('error', err);
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}
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} else {
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// Either lazyConnect or connector initialize() defers the connection
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debug('DataSource %s will be connected to connector %s', this.name,
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this.connector.name);
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}
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}.bind(this);
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try {
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if ('function' === typeof connector.initialize) {
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// Call the async initialize method
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debug('Initializing connector %s', connector.name);
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connector.initialize(this, postInit);
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} else if ('function' === typeof connector) {
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// Use the connector constructor directly
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this.connector = new connector(this.settings);
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postInit();
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}
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} catch (err) {
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if (err.message) {
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err.message = 'Cannot initialize connector ' +
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JSON.stringify(connectorName) + ': ' +
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err.message;
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}
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throw err;
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}
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}
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};
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|
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function isModelClass(cls) {
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if (!cls) {
|
|
return false;
|
|
}
|
|
return cls.prototype instanceof ModelBaseClass;
|
|
}
|
|
|
|
DataSource.relationTypes = Object.keys(RelationDefinition.RelationTypes);
|
|
|
|
function isModelDataSourceAttached(model) {
|
|
return model && (!model.settings.unresolved) && (model.dataSource instanceof DataSource);
|
|
}
|
|
|
|
/*!
|
|
* Define scopes for the model class from the scopes object. See
|
|
* [scopes](./Model-definition-JSON-file.html#scopes) for more information on
|
|
* scopes and valid options objects.
|
|
* @param {Object} modelClass - The model class that corresponds to the model
|
|
* definition that will be enhanced by the provided scopes.
|
|
* @param {Object} scopes A key-value collection of names and their object
|
|
* definitions
|
|
* @property options The options defined on the scope object.
|
|
*/
|
|
DataSource.prototype.defineScopes = function(modelClass, scopes) {
|
|
if (scopes) {
|
|
for (const s in scopes) {
|
|
defineScope(modelClass, modelClass, s, scopes[s], {}, scopes[s].options);
|
|
}
|
|
}
|
|
};
|
|
|
|
/*!
|
|
* Define relations for the model class from the relations object. See
|
|
* [relations](./Model-definition-JSON-file.html#relations) for more information.
|
|
* @param {Object} modelClass - The model class that corresponds to the model
|
|
* definition that will be enhanced by the provided relations.
|
|
* @param {Object} relations A key-value collection of relation names and their
|
|
* object definitions.
|
|
*/
|
|
DataSource.prototype.defineRelations = function(modelClass, relations) {
|
|
const self = this;
|
|
|
|
// Wait for target/through models to be attached before setting up the relation
|
|
const deferRelationSetup = function(relationName, relation, targetModel, throughModel) {
|
|
if (!isModelDataSourceAttached(targetModel)) {
|
|
targetModel.once('dataAccessConfigured', function(targetModel) {
|
|
// Check if the through model doesn't exist or resolved
|
|
if (!throughModel || isModelDataSourceAttached(throughModel)) {
|
|
// The target model is resolved
|
|
const params = traverse(relation).clone();
|
|
params.as = relationName;
|
|
params.model = targetModel;
|
|
if (throughModel) {
|
|
params.through = throughModel;
|
|
}
|
|
modelClass[relation.type].call(modelClass, relationName, params);
|
|
}
|
|
});
|
|
}
|
|
|
|
if (throughModel && !isModelDataSourceAttached(throughModel)) {
|
|
// Set up a listener to the through model
|
|
throughModel.once('dataAccessConfigured', function(throughModel) {
|
|
if (isModelDataSourceAttached(targetModel)) {
|
|
// The target model is resolved
|
|
const params = traverse(relation).clone();
|
|
params.as = relationName;
|
|
params.model = targetModel;
|
|
params.through = throughModel;
|
|
modelClass[relation.type].call(modelClass, relationName, params);
|
|
}
|
|
});
|
|
}
|
|
};
|
|
|
|
// Set up the relations
|
|
if (relations) {
|
|
Object.keys(relations).forEach(function(relationName) {
|
|
let targetModel;
|
|
const r = relations[relationName];
|
|
|
|
validateRelation(relationName, r);
|
|
|
|
if (r.model) {
|
|
targetModel = isModelClass(r.model) ? r.model : self.getModel(r.model, true);
|
|
}
|
|
|
|
let throughModel = null;
|
|
if (r.through) {
|
|
throughModel = isModelClass(r.through) ? r.through : self.getModel(r.through, true);
|
|
}
|
|
|
|
if ((targetModel && !isModelDataSourceAttached(targetModel)) ||
|
|
(throughModel && !isModelDataSourceAttached(throughModel))) {
|
|
// Create a listener to defer the relation set up
|
|
deferRelationSetup(relationName, r, targetModel, throughModel);
|
|
} else {
|
|
// The target model is resolved
|
|
const params = traverse(r).clone();
|
|
params.as = relationName;
|
|
params.model = targetModel;
|
|
if (throughModel) {
|
|
params.through = throughModel;
|
|
}
|
|
modelClass[r.type].call(modelClass, relationName, params);
|
|
}
|
|
});
|
|
}
|
|
};
|
|
|
|
function validateRelation(relationName, relation) {
|
|
const rn = relationName;
|
|
const r = relation;
|
|
let msg, code;
|
|
|
|
assert(DataSource.relationTypes.indexOf(r.type) !== -1, 'Invalid relation type: ' + r.type);
|
|
assert(isValidRelationName(rn), 'Invalid relation name: ' + rn);
|
|
|
|
// VALIDATION ERRORS
|
|
|
|
// non polymorphic belongsTo relations should have `model` defined
|
|
if (!r.polymorphic && r.type === 'belongsTo' && !r.model) {
|
|
msg = g.f('%s relation: %s requires param `model`', r.type, rn);
|
|
code = 'BELONGS_TO_MISSING_MODEL';
|
|
}
|
|
// polymorphic belongsTo relations should not have `model` defined
|
|
if (r.polymorphic && r.type === 'belongsTo' && r.model) {
|
|
msg = g.f('{{polymorphic}} %s relation: %s does not expect param `model`', r.type, rn);
|
|
code = 'POLYMORPHIC_BELONGS_TO_MODEL';
|
|
}
|
|
// polymorphic relations other than belongsTo should have `model` defined
|
|
if (r.polymorphic && r.type !== 'belongsTo' && !r.model) {
|
|
msg = g.f('{{polymorphic}} %s relation: %s requires param `model`', r.type, rn);
|
|
code = 'POLYMORPHIC_NOT_BELONGS_TO_MISSING_MODEL';
|
|
}
|
|
// polymorphic relations should provide both discriminator and foreignKey or none
|
|
if (r.polymorphic && r.polymorphic.foreignKey && !r.polymorphic.discriminator) {
|
|
msg = g.f('{{polymorphic}} %s relation: %s requires param `polymorphic.discriminator` ' +
|
|
'when param `polymorphic.foreignKey` is provided', r.type, rn);
|
|
code = 'POLYMORPHIC_MISSING_DISCRIMINATOR';
|
|
}
|
|
// polymorphic relations should provide both discriminator and foreignKey or none
|
|
if (r.polymorphic && r.polymorphic.discriminator && !r.polymorphic.foreignKey) {
|
|
msg = g.f('{{polymorphic}} %s relation: %s requires param `polymorphic.foreignKey` ' +
|
|
'when param `polymorphic.discriminator` is provided', r.type, rn);
|
|
code = 'POLYMORPHIC_MISSING_FOREIGN_KEY';
|
|
}
|
|
// polymorphic relations should not provide polymorphic.as when using custom foreignKey/discriminator
|
|
if (r.polymorphic && r.polymorphic.as && r.polymorphic.foreignKey) {
|
|
msg = g.f('{{polymorphic}} %s relation: %s does not expect param `polymorphic.as` ' +
|
|
'when defing custom `foreignKey`/`discriminator` ', r.type, rn);
|
|
code = 'POLYMORPHIC_EXTRANEOUS_AS';
|
|
}
|
|
// polymorphic relations should not provide polymorphic.as when using custom foreignKey/discriminator
|
|
if (r.polymorphic && r.polymorphic.selector && r.polymorphic.foreignKey) {
|
|
msg = g.f('{{polymorphic}} %s relation: %s does not expect param `polymorphic.selector` ' +
|
|
'when defing custom `foreignKey`/`discriminator` ', r.type, rn);
|
|
code = 'POLYMORPHIC_EXTRANEOUS_SELECTOR';
|
|
}
|
|
|
|
if (msg) {
|
|
const error = new Error(msg);
|
|
error.details = {code: code, rType: r.type, rName: rn};
|
|
throw error;
|
|
}
|
|
|
|
// DEPRECATION WARNINGS
|
|
if (r.polymorphic && r.polymorphic.as) {
|
|
deprecated(g.f('WARNING: {{polymorphic}} %s relation: %s uses keyword `polymorphic.as` which will ' +
|
|
'be DEPRECATED in LoopBack.next, refer to this doc for replacement solutions ' +
|
|
'(https://loopback.io/doc/en/lb3/Polymorphic-relations.html#deprecated-polymorphic-as)',
|
|
r.type, rn), r.type);
|
|
}
|
|
}
|
|
|
|
function isValidRelationName(relationName) {
|
|
const invalidRelationNames = ['trigger'];
|
|
return invalidRelationNames.indexOf(relationName) === -1;
|
|
}
|
|
|
|
/*!
|
|
* Set up the data access functions from the data source. Each data source will
|
|
* expose a data access object (DAO), which will be mixed into the modelClass.
|
|
* @param {Model} modelClass The model class that will receive DAO mixins.
|
|
* @param {Object} settings The settings object; typically allows any settings
|
|
* that would be valid for a typical Model object.
|
|
*/
|
|
DataSource.prototype.setupDataAccess = function(modelClass, settings) {
|
|
if (this.connector) {
|
|
// Check if the id property should be generated
|
|
const idName = modelClass.definition.idName();
|
|
const idProp = modelClass.definition.rawProperties[idName];
|
|
if (idProp && idProp.generated && idProp.useDefaultIdType !== false && this.connector.getDefaultIdType) {
|
|
// Set the default id type from connector's ability
|
|
const idType = this.connector.getDefaultIdType() || String;
|
|
idProp.type = idType;
|
|
modelClass.definition.rawProperties[idName].type = idType;
|
|
modelClass.definition.properties[idName].type = idType;
|
|
}
|
|
if (this.connector.define) {
|
|
// pass control to connector
|
|
this.connector.define({
|
|
model: modelClass,
|
|
properties: modelClass.definition.properties,
|
|
settings: settings,
|
|
});
|
|
}
|
|
}
|
|
|
|
// add data access objects
|
|
this.mixin(modelClass);
|
|
|
|
// define relations from LDL (options.relations)
|
|
const relations = settings.relationships || settings.relations;
|
|
this.defineRelations(modelClass, relations);
|
|
|
|
// Emit the dataAccessConfigured event to indicate all the methods for data
|
|
// access have been mixed into the model class
|
|
modelClass.emit('dataAccessConfigured', modelClass);
|
|
|
|
// define scopes from LDL (options.relations)
|
|
const scopes = settings.scopes || {};
|
|
this.defineScopes(modelClass, scopes);
|
|
};
|
|
|
|
/**
|
|
* Define a model class. Returns newly created model object.
|
|
* The first (String) argument specifying the model name is required.
|
|
* You can provide one or two JSON object arguments, to provide configuration options.
|
|
* See [Model definition reference](http://docs.strongloop.com/display/DOC/Model+definition+reference) for details.
|
|
*
|
|
* Simple example:
|
|
* ```
|
|
* var User = dataSource.createModel('User', {
|
|
* email: String,
|
|
* password: String,
|
|
* birthDate: Date,
|
|
* activated: Boolean
|
|
* });
|
|
* ```
|
|
* More advanced example
|
|
* ```
|
|
* var User = dataSource.createModel('User', {
|
|
* email: { type: String, limit: 150, index: true },
|
|
* password: { type: String, limit: 50 },
|
|
* birthDate: Date,
|
|
* registrationDate: {type: Date, default: function () { return new Date }},
|
|
* activated: { type: Boolean, default: false }
|
|
* });
|
|
* ```
|
|
* You can also define an ACL when you create a new data source with the `DataSource.create()` method. For example:
|
|
*
|
|
* ```js
|
|
* var Customer = ds.createModel('Customer', {
|
|
* name: {
|
|
* type: String,
|
|
* acls: [
|
|
* {principalType: ACL.USER, principalId: 'u001', accessType: ACL.WRITE, permission: ACL.DENY},
|
|
* {principalType: ACL.USER, principalId: 'u001', accessType: ACL.ALL, permission: ACL.ALLOW}
|
|
* ]
|
|
* }
|
|
* }, {
|
|
* acls: [
|
|
* {principalType: ACL.USER, principalId: 'u001', accessType: ACL.ALL, permission: ACL.ALLOW}
|
|
* ]
|
|
* });
|
|
* ```
|
|
*
|
|
* @param {String} className Name of the model to create.
|
|
* @param {Object} properties Hash of model properties in format `{property: Type, property2: Type2, ...}` or `{property: {type: Type}, property2: {type: Type2}, ...}`
|
|
* @options {Object} properties Other configuration options. This corresponds to the options key in the config object.
|
|
* @param {Object} settings A settings object that would typically be used for Model objects.
|
|
*/
|
|
|
|
DataSource.prototype.createModel =
|
|
DataSource.prototype.define = function defineClass(className, properties, settings) {
|
|
const args = slice.call(arguments);
|
|
|
|
if (!className) {
|
|
throw new Error(g.f('Class name required'));
|
|
}
|
|
if (args.length === 1) {
|
|
properties = {};
|
|
args.push(properties);
|
|
}
|
|
if (args.length === 2) {
|
|
settings = {};
|
|
args.push(settings);
|
|
}
|
|
|
|
properties = properties || {};
|
|
settings = settings || {};
|
|
|
|
if (this.isRelational()) {
|
|
// Set the strict mode to be true for relational DBs by default
|
|
if (settings.strict === undefined || settings.strict === null) {
|
|
settings.strict = true;
|
|
}
|
|
if (settings.strict === false) {
|
|
settings.strict = 'throw';
|
|
}
|
|
}
|
|
|
|
const modelClass = this.modelBuilder.define(className, properties, settings);
|
|
modelClass.dataSource = this;
|
|
|
|
if (settings.unresolved) {
|
|
return modelClass;
|
|
}
|
|
|
|
this.setupDataAccess(modelClass, settings);
|
|
modelClass.emit('dataSourceAttached', modelClass);
|
|
|
|
return modelClass;
|
|
};
|
|
|
|
/**
|
|
* Remove a model from the registry.
|
|
*
|
|
* @param {String} modelName
|
|
*/
|
|
DataSource.prototype.deleteModelByName = function(modelName) {
|
|
this.modelBuilder.deleteModelByName(modelName);
|
|
delete this.connector._models[modelName];
|
|
};
|
|
|
|
/**
|
|
* Remove all models from the registry, but keep the connector instance
|
|
* (including the pool of database connections).
|
|
*/
|
|
DataSource.prototype.deleteAllModels = function() {
|
|
for (const m in this.modelBuilder.models) {
|
|
this.deleteModelByName(m);
|
|
}
|
|
};
|
|
|
|
/**
|
|
* Mixin DataAccessObject methods.
|
|
*
|
|
* @param {Function} ModelCtor The model constructor
|
|
* @private
|
|
*/
|
|
|
|
DataSource.prototype.mixin = function(ModelCtor) {
|
|
const ops = this.operations();
|
|
const DAO = this.DataAccessObject;
|
|
|
|
// mixin DAO
|
|
jutil.mixin(ModelCtor, DAO, {proxyFunctions: true, override: true});
|
|
|
|
// decorate operations as alias functions
|
|
Object.keys(ops).forEach(function(name) {
|
|
const op = ops[name];
|
|
let scope;
|
|
|
|
if (op.enabled) {
|
|
scope = op.prototype ? ModelCtor.prototype : ModelCtor;
|
|
// var sfn = scope[name] = function () {
|
|
// op.scope[op.fnName].apply(self, arguments);
|
|
// }
|
|
Object.keys(op)
|
|
.filter(function(key) {
|
|
// filter out the following keys
|
|
return ~[
|
|
'scope',
|
|
'fnName',
|
|
'prototype',
|
|
].indexOf(key);
|
|
})
|
|
.forEach(function(key) {
|
|
if (typeof op[key] !== 'undefined') {
|
|
op.scope[op.fnName][key] = op[key];
|
|
}
|
|
});
|
|
}
|
|
});
|
|
};
|
|
|
|
/*! Method will be deprecated in LoopBack.next
|
|
*/
|
|
/**
|
|
* See [ModelBuilder.getModel](http://apidocs.strongloop.com/loopback-datasource-juggler/#modelbuilder-prototype-getmodel)
|
|
* for details.
|
|
*/
|
|
DataSource.prototype.getModel = function(name, forceCreate) {
|
|
return this.modelBuilder.getModel(name, forceCreate);
|
|
};
|
|
|
|
/*! Method will be deprecated in LoopBack.next
|
|
*/
|
|
/**
|
|
* See ModelBuilder.getModelDefinition
|
|
* See [ModelBuilder.getModelDefinition](http://apidocs.strongloop.com/loopback-datasource-juggler/#modelbuilder-prototype-getmodeldefinition)
|
|
* for details.
|
|
*/
|
|
DataSource.prototype.getModelDefinition = function(name) {
|
|
return this.modelBuilder.getModelDefinition(name);
|
|
};
|
|
|
|
/*! Method will be deprecated in LoopBack.next
|
|
*/
|
|
/**
|
|
* Get the data source types collection.
|
|
* @returns {String[]} The data source type array.
|
|
* For example, ['db', 'nosql', 'mongodb'] would be represent a datasource of
|
|
* type 'db', with a subtype of 'nosql', and would use the 'mongodb' connector.
|
|
*
|
|
* Alternatively, ['rest'] would be a different type altogether, and would have
|
|
* no subtype.
|
|
*/
|
|
DataSource.prototype.getTypes = function() {
|
|
const getTypes = this.connector && this.connector.getTypes;
|
|
let types = getTypes && getTypes() || [];
|
|
if (typeof types === 'string') {
|
|
types = types.split(/[\s,\/]+/);
|
|
}
|
|
return types;
|
|
};
|
|
|
|
/**
|
|
* Check the data source supports the specified types.
|
|
* @param {String|String[]} types Type name or an array of type names.
|
|
* @returns {Boolean} true if all types are supported by the data source
|
|
*/
|
|
DataSource.prototype.supportTypes = function(types) {
|
|
const supportedTypes = this.getTypes();
|
|
if (Array.isArray(types)) {
|
|
// Check each of the types
|
|
for (let i = 0; i < types.length; i++) {
|
|
if (supportedTypes.indexOf(types[i]) === -1) {
|
|
// Not supported
|
|
return false;
|
|
}
|
|
}
|
|
return true;
|
|
} else {
|
|
// The types is a string
|
|
return supportedTypes.indexOf(types) !== -1;
|
|
}
|
|
};
|
|
|
|
/*! In future versions, this will not maintain a strict 1:1 relationship between datasources and model classes
|
|
* Moving forward, we will allow a model to be attached to a datasource. The model itself becomes a template.
|
|
*/
|
|
/**
|
|
* Attach an existing model to a data source.
|
|
* This will mixin all of the data access object functions (DAO) into your
|
|
* modelClass definition.
|
|
* @param {Function} modelClass The model constructor that will be enhanced by
|
|
* DAO mixins.
|
|
*/
|
|
|
|
DataSource.prototype.attach = function(modelClass) {
|
|
if (modelClass.dataSource === this) {
|
|
// Already attached to the data source
|
|
return modelClass;
|
|
}
|
|
|
|
if (modelClass.modelBuilder !== this.modelBuilder) {
|
|
this.modelBuilder.definitions[modelClass.modelName] = modelClass.definition;
|
|
this.modelBuilder.models[modelClass.modelName] = modelClass;
|
|
// reset the modelBuilder
|
|
modelClass.modelBuilder = this.modelBuilder;
|
|
}
|
|
|
|
// redefine the dataSource
|
|
modelClass.dataSource = this;
|
|
|
|
this.setupDataAccess(modelClass, modelClass.settings);
|
|
modelClass.emit('dataSourceAttached', modelClass);
|
|
return modelClass;
|
|
};
|
|
|
|
/*! Method will be deprecated in LoopBack.next
|
|
*/
|
|
/**
|
|
* Define a property with name `prop` on a target `model`. See
|
|
* [Properties](./Model-definition-JSON-file.html#properties) for more information
|
|
* regarding valid options for `params`.
|
|
* @param {String} model Name of model
|
|
* @param {String} prop Name of property
|
|
* @param {Property} params Property settings
|
|
*/
|
|
DataSource.prototype.defineProperty = function(model, prop, params) {
|
|
this.modelBuilder.defineProperty(model, prop, params);
|
|
|
|
const resolvedProp = this.getModelDefinition(model).properties[prop];
|
|
if (this.connector && this.connector.defineProperty) {
|
|
this.connector.defineProperty(model, prop, resolvedProp);
|
|
}
|
|
};
|
|
|
|
/**
|
|
* Drop schema objects such as tables, indexes, views, triggers, etc that correspond
|
|
* to model definitions attached to this DataSource instance, specified by the `models` parameter.
|
|
*
|
|
* **WARNING**: In many situations, this will destroy data! `autoupdate()` will attempt to preserve
|
|
* data while updating the schema on your target DataSource, but this is not guaranteed to be safe.
|
|
*
|
|
* Please check the documentation for your specific connector(s) for a detailed breakdown of
|
|
* behaviors for automigrate!
|
|
*
|
|
* @param {String|String[]} [models] Model(s) to migrate. If not present, apply to all models.
|
|
* @param {Function} [callback] Callback function. Optional.
|
|
*
|
|
*/
|
|
DataSource.prototype.automigrate = function(models, cb) {
|
|
this.freeze();
|
|
|
|
if ((!cb) && ('function' === typeof models)) {
|
|
cb = models;
|
|
models = undefined;
|
|
}
|
|
|
|
cb = cb || utils.createPromiseCallback();
|
|
|
|
if (!this.connector.automigrate) {
|
|
// NOOP
|
|
process.nextTick(cb);
|
|
return cb.promise;
|
|
}
|
|
|
|
// First argument is a model name
|
|
if ('string' === typeof models) {
|
|
models = [models];
|
|
}
|
|
|
|
const attachedModels = this.connector._models;
|
|
|
|
if (attachedModels && typeof attachedModels === 'object') {
|
|
models = models || Object.keys(attachedModels);
|
|
|
|
if (models.length === 0) {
|
|
process.nextTick(cb);
|
|
return cb.promise;
|
|
}
|
|
|
|
const invalidModels = models.filter(function(m) {
|
|
return !(m in attachedModels);
|
|
});
|
|
|
|
if (invalidModels.length) {
|
|
process.nextTick(function() {
|
|
cb(new Error(g.f('Cannot migrate models not attached to this datasource: %s',
|
|
invalidModels.join(' '))));
|
|
});
|
|
return cb.promise;
|
|
}
|
|
}
|
|
|
|
const args = [models, cb];
|
|
args.callee = this.automigrate;
|
|
const queued = this.ready(this, args);
|
|
if (queued) {
|
|
// waiting to connect
|
|
return cb.promise;
|
|
}
|
|
|
|
this.connector.automigrate(models, cb);
|
|
return cb.promise;
|
|
};
|
|
|
|
/**
|
|
* Update existing database tables.
|
|
* This method applies only to database connectors.
|
|
*
|
|
* **WARNING**: `autoupdate()` will attempt to preserve data while updating the
|
|
* schema on your target DataSource, but this is not guaranteed to be safe.
|
|
*
|
|
* Please check the documentation for your specific connector(s) for a detailed breakdown of
|
|
* behaviors for automigrate!*
|
|
*
|
|
* @param {String|String[]} [models] Model(s) to migrate. If not present, apply to all models.
|
|
* @param {Function} [cb] The callback function
|
|
*/
|
|
DataSource.prototype.autoupdate = function(models, cb) {
|
|
this.freeze();
|
|
|
|
if ((!cb) && ('function' === typeof models)) {
|
|
cb = models;
|
|
models = undefined;
|
|
}
|
|
|
|
cb = cb || utils.createPromiseCallback();
|
|
|
|
if (!this.connector.autoupdate) {
|
|
// NOOP
|
|
process.nextTick(cb);
|
|
return cb.promise;
|
|
}
|
|
|
|
// First argument is a model name
|
|
if ('string' === typeof models) {
|
|
models = [models];
|
|
}
|
|
|
|
const attachedModels = this.connector._models;
|
|
|
|
if (attachedModels && typeof attachedModels === 'object') {
|
|
models = models || Object.keys(attachedModels);
|
|
|
|
if (models.length === 0) {
|
|
process.nextTick(cb);
|
|
return cb.promise;
|
|
}
|
|
|
|
const invalidModels = models.filter(function(m) {
|
|
return !(m in attachedModels);
|
|
});
|
|
|
|
if (invalidModels.length) {
|
|
process.nextTick(function() {
|
|
cb(new Error(g.f('Cannot migrate models not attached to this datasource: %s',
|
|
invalidModels.join(' '))));
|
|
});
|
|
return cb.promise;
|
|
}
|
|
}
|
|
|
|
const args = [models, cb];
|
|
args.callee = this.autoupdate;
|
|
const queued = this.ready(this, args);
|
|
if (queued) {
|
|
// waiting to connect
|
|
return cb.promise;
|
|
}
|
|
|
|
this.connector.autoupdate(models, cb);
|
|
return cb.promise;
|
|
};
|
|
|
|
/**
|
|
* Discover existing database tables.
|
|
* This method returns an array of model objects, including {type, name, onwer}
|
|
*
|
|
* @options {Object} options Discovery options. See below.
|
|
* @param {Function} Callback function. Optional.
|
|
* @property {String} owner/schema The owner or schema to discover from.
|
|
* @property {Boolean} all If true, discover all models; if false, discover only models owned by the current user.
|
|
* @property {Boolean} views If true, include views; if false, only tables.
|
|
* @property {Number} limit Page size
|
|
* @property {Number} offset Starting index
|
|
* @returns {ModelDefinition[]}
|
|
*/
|
|
DataSource.prototype.discoverModelDefinitions = function(options, cb) {
|
|
this.freeze();
|
|
|
|
if (cb === undefined && typeof options === 'function') {
|
|
cb = options;
|
|
options = {};
|
|
}
|
|
options = options || {};
|
|
cb = cb || utils.createPromiseCallback();
|
|
|
|
if (this.connector.discoverModelDefinitions) {
|
|
this.connector.discoverModelDefinitions(options, cb);
|
|
} else if (cb) {
|
|
process.nextTick(cb);
|
|
}
|
|
return cb.promise;
|
|
};
|
|
|
|
/*! Method will be completely removed in LoopBack.next
|
|
*/
|
|
/**
|
|
* The synchronous version of discoverModelDefinitions.
|
|
* @options {Object} options The options
|
|
* @property {Boolean} all If true, discover all models; if false, discover only models owned by the current user.
|
|
* @property {Boolean} views If true, nclude views; if false, only tables.
|
|
* @property {Number} limit Page size
|
|
* @property {Number} offset Starting index
|
|
* @returns {ModelDefinition[]}
|
|
*/
|
|
DataSource.prototype.discoverModelDefinitionsSync = function(options) {
|
|
this.freeze();
|
|
if (this.connector.discoverModelDefinitionsSync) {
|
|
return this.connector.discoverModelDefinitionsSync(options);
|
|
}
|
|
return null;
|
|
};
|
|
|
|
/**
|
|
* Discover properties for a given model.
|
|
*
|
|
* Callback function return value is an object that can have the following properties:
|
|
*
|
|
*| Key | Type | Description |
|
|
*|-----|------|-------------|
|
|
*|owner | String | Database owner or schema|
|
|
*|tableName | String | Table/view name|
|
|
*|columnName | String | Column name|
|
|
*|dataType | String | Data type|
|
|
*|dataLength | Number | Data length|
|
|
*|dataPrecision | Number | Numeric data precision|
|
|
*|dataScale |Number | Numeric data scale|
|
|
*|nullable |Boolean | If true, then the data can be null|
|
|
* See [Properties](./Model-definition-JSON-file.html#properties) for more
|
|
* details on the Property return type.
|
|
* @param {String} modelName The table/view name
|
|
* @options {Object} options The options
|
|
* @property {String} owner|schema The database owner or schema
|
|
* @param {Function} cb Callback function. Optional
|
|
* @callback cb
|
|
* @returns {Promise} A promise that returns an array of Properties (Property[])
|
|
*
|
|
*/
|
|
DataSource.prototype.discoverModelProperties = function(modelName, options, cb) {
|
|
this.freeze();
|
|
|
|
if (cb === undefined && typeof options === 'function') {
|
|
cb = options;
|
|
options = {};
|
|
}
|
|
options = options || {};
|
|
cb = cb || utils.createPromiseCallback();
|
|
|
|
if (this.connector.discoverModelProperties) {
|
|
this.connector.discoverModelProperties(modelName, options, cb);
|
|
} else if (cb) {
|
|
process.nextTick(cb);
|
|
}
|
|
return cb.promise;
|
|
};
|
|
|
|
/*! Method will be completely removed in LoopBack.next
|
|
*/
|
|
/**
|
|
* The synchronous version of discoverModelProperties
|
|
* @param {String} modelName The table/view name
|
|
* @param {Object} options The options
|
|
* @returns {*}
|
|
*/
|
|
DataSource.prototype.discoverModelPropertiesSync = function(modelName, options) {
|
|
this.freeze();
|
|
if (this.connector.discoverModelPropertiesSync) {
|
|
return this.connector.discoverModelPropertiesSync(modelName, options);
|
|
}
|
|
return null;
|
|
};
|
|
|
|
/**
|
|
* Discover primary keys for a given owner/modelName.
|
|
* Callback function return value is an object that can have the following properties:
|
|
*
|
|
*| Key | Type | Description |
|
|
*|-----|------|-------------|
|
|
*| owner |String | Table schema or owner (may be null). Owner defaults to current user.
|
|
*| tableName |String| Table name
|
|
*| columnName |String| Column name
|
|
*| keySeq |Number| Sequence number within primary key (1 indicates the first column in the primary key; 2 indicates the second column in the primary key).
|
|
*| pkName |String| Primary key name (may be null)
|
|
* See [ID Properties](./Model-definition-JSON-file.html#id-properties) for more
|
|
* information.
|
|
* @param {String} modelName The model name
|
|
* @options {Object} options The options
|
|
* @property {String} owner|schema The database owner or schema
|
|
* @param {Function} [cb] The callback function
|
|
* @returns {Promise} A promise with an array of Primary Keys (Property[])
|
|
*/
|
|
DataSource.prototype.discoverPrimaryKeys = function(modelName, options, cb) {
|
|
this.freeze();
|
|
|
|
if (cb === undefined && typeof options === 'function') {
|
|
cb = options;
|
|
options = {};
|
|
}
|
|
options = options || {};
|
|
cb = cb || utils.createPromiseCallback();
|
|
|
|
if (this.connector.discoverPrimaryKeys) {
|
|
this.connector.discoverPrimaryKeys(modelName, options, cb);
|
|
} else if (cb) {
|
|
process.nextTick(cb);
|
|
}
|
|
return cb.promise;
|
|
};
|
|
|
|
/*! Method will be completely removed in LoopBack.next
|
|
*/
|
|
/**
|
|
* The synchronous version of discoverPrimaryKeys
|
|
* @param {String} modelName The model name
|
|
* @options {Object} options The options
|
|
* @property {String} owner|schema The database owner or schema
|
|
* @returns {*}
|
|
*/
|
|
DataSource.prototype.discoverPrimaryKeysSync = function(modelName, options) {
|
|
this.freeze();
|
|
if (this.connector.discoverPrimaryKeysSync) {
|
|
return this.connector.discoverPrimaryKeysSync(modelName, options);
|
|
}
|
|
return null;
|
|
};
|
|
|
|
/**
|
|
* Discover foreign keys for a given owner/modelName
|
|
*
|
|
* Callback function return value is an object that can have the following properties:
|
|
*
|
|
*| Key | Type | Description |
|
|
*|-----|------|-------------|
|
|
*|fkOwner |String | Foreign key table schema (may be null)
|
|
*|fkName |String | Foreign key name (may be null)
|
|
*|fkTableName |String | Foreign key table name
|
|
*|fkColumnName |String | Foreign key column name
|
|
*|keySeq |Number | Sequence number within a foreign key( a value of 1 represents the first column of the foreign key, a value of 2 would represent the second column within the foreign key).
|
|
*|pkOwner |String | Primary key table schema being imported (may be null)
|
|
*|pkName |String | Primary key name (may be null)
|
|
*|pkTableName |String | Primary key table name being imported
|
|
*|pkColumnName |String | Primary key column name being imported
|
|
* See [Relations](/Model-definition-JSON-file.html#relations) for more
|
|
* information.
|
|
* @param {String} modelName The model name
|
|
* @options {Object} options The options
|
|
* @property {String} owner|schema The database owner or schema
|
|
* @param {Function} [cb] The callback function
|
|
* @returns {Promise} A Promise with an array of foreign key relations.
|
|
*
|
|
*/
|
|
DataSource.prototype.discoverForeignKeys = function(modelName, options, cb) {
|
|
this.freeze();
|
|
|
|
if (cb === undefined && typeof options === 'function') {
|
|
cb = options;
|
|
options = {};
|
|
}
|
|
options = options || {};
|
|
cb = cb || utils.createPromiseCallback();
|
|
|
|
if (this.connector.discoverForeignKeys) {
|
|
this.connector.discoverForeignKeys(modelName, options, cb);
|
|
} else if (cb) {
|
|
process.nextTick(cb);
|
|
}
|
|
return cb.promise;
|
|
};
|
|
|
|
/*! Method will be completely removed in LoopBack.next
|
|
*/
|
|
/**
|
|
* The synchronous version of discoverForeignKeys
|
|
*
|
|
* @param {String} modelName The model name
|
|
* @param {Object} options The options
|
|
* @returns {*}
|
|
*/
|
|
DataSource.prototype.discoverForeignKeysSync = function(modelName, options) {
|
|
this.freeze();
|
|
if (this.connector.discoverForeignKeysSync) {
|
|
return this.connector.discoverForeignKeysSync(modelName, options);
|
|
}
|
|
return null;
|
|
};
|
|
|
|
/**
|
|
* Retrieves a description of the foreign key columns that reference the given table's primary key columns
|
|
* (the foreign keys exported by a table), ordered by fkTableOwner, fkTableName, and keySeq.
|
|
*
|
|
* Callback function return value is an object that can have the following properties:
|
|
*
|
|
*| Key | Type | Description |
|
|
*|-----|------|-------------|
|
|
*|fkOwner |String | Foreign key table schema (may be null)
|
|
*|fkName |String | Foreign key name (may be null)
|
|
*|fkTableName |String | Foreign key table name
|
|
*|fkColumnName |String | Foreign key column name
|
|
*|keySeq |Number | Sequence number within a foreign key( a value of 1 represents the first column of the foreign key, a value of 2 would represent the second column within the foreign key).
|
|
*|pkOwner |String | Primary key table schema being imported (may be null)
|
|
*|pkName |String | Primary key name (may be null)
|
|
*|pkTableName |String | Primary key table name being imported
|
|
*|pkColumnName |String | Primary key column name being imported
|
|
* See [Relations](/Model-definition-JSON-file.html#relations) for more
|
|
* information.
|
|
*
|
|
* @param {String} modelName The model name
|
|
* @options {Object} options The options
|
|
* @property {String} owner|schema The database owner or schema
|
|
* @param {Function} [cb] The callback function
|
|
* @returns {Promise} A Promise with an array of exported foreign key relations.
|
|
*/
|
|
DataSource.prototype.discoverExportedForeignKeys = function(modelName, options, cb) {
|
|
this.freeze();
|
|
|
|
if (cb === undefined && typeof options === 'function') {
|
|
cb = options;
|
|
options = {};
|
|
}
|
|
options = options || {};
|
|
cb = cb || utils.createPromiseCallback();
|
|
|
|
if (this.connector.discoverExportedForeignKeys) {
|
|
this.connector.discoverExportedForeignKeys(modelName, options, cb);
|
|
} else if (cb) {
|
|
process.nextTick(cb);
|
|
}
|
|
return cb.promise;
|
|
};
|
|
|
|
/*! Method will be completely removed in LoopBack.next
|
|
*/
|
|
/**
|
|
* The synchronous version of discoverExportedForeignKeys
|
|
* @param {String} modelName The model name
|
|
* @param {Object} options The options
|
|
* @returns {*}
|
|
*/
|
|
DataSource.prototype.discoverExportedForeignKeysSync = function(modelName, options) {
|
|
this.freeze();
|
|
if (this.connector.discoverExportedForeignKeysSync) {
|
|
return this.connector.discoverExportedForeignKeysSync(modelName, options);
|
|
}
|
|
return null;
|
|
};
|
|
|
|
function capitalize(str) {
|
|
if (!str) {
|
|
return str;
|
|
}
|
|
return str.charAt(0).toUpperCase() + ((str.length > 1) ? str.slice(1).toLowerCase() : '');
|
|
}
|
|
|
|
function fromDBName(dbName, camelCase) {
|
|
if (!dbName) {
|
|
return dbName;
|
|
}
|
|
const parts = dbName.split(/-|_/);
|
|
parts[0] = camelCase ? parts[0].toLowerCase() : capitalize(parts[0]);
|
|
|
|
for (let i = 1; i < parts.length; i++) {
|
|
parts[i] = capitalize(parts[i]);
|
|
}
|
|
return parts.join('');
|
|
}
|
|
|
|
/**
|
|
* Discover one schema from the given model without following the relations.
|
|
**Example schema from oracle connector:**
|
|
*
|
|
* ```js
|
|
* {
|
|
* "name": "Product",
|
|
* "options": {
|
|
* "idInjection": false,
|
|
* "oracle": {
|
|
* "schema": "BLACKPOOL",
|
|
* "table": "PRODUCT"
|
|
* }
|
|
* },
|
|
* "properties": {
|
|
* "id": {
|
|
* "type": "String",
|
|
* "required": true,
|
|
* "length": 20,
|
|
* "id": 1,
|
|
* "oracle": {
|
|
* "columnName": "ID",
|
|
* "dataType": "VARCHAR2",
|
|
* "dataLength": 20,
|
|
* "nullable": "N"
|
|
* }
|
|
* },
|
|
* "name": {
|
|
* "type": "String",
|
|
* "required": false,
|
|
* "length": 64,
|
|
* "oracle": {
|
|
* "columnName": "NAME",
|
|
* "dataType": "VARCHAR2",
|
|
* "dataLength": 64,
|
|
* "nullable": "Y"
|
|
* }
|
|
* },
|
|
* ...
|
|
* "fireModes": {
|
|
* "type": "String",
|
|
* "required": false,
|
|
* "length": 64,
|
|
* "oracle": {
|
|
* "columnName": "FIRE_MODES",
|
|
* "dataType": "VARCHAR2",
|
|
* "dataLength": 64,
|
|
* "nullable": "Y"
|
|
* }
|
|
* }
|
|
* }
|
|
* }
|
|
* ```
|
|
*
|
|
* @param {String} tableName The name of the table to discover.
|
|
* @options {Object} [options] An options object typically used for Relations.
|
|
* See [Relations](./Model-definition-JSON-file.html#relations) for more information.
|
|
* @param {Function} [cb] The callback function
|
|
* @returns {Promise} A promise object that resolves to a single schema.
|
|
*/
|
|
DataSource.prototype.discoverSchema = function(tableName, options, cb) {
|
|
options = options || {};
|
|
|
|
if (!cb && 'function' === typeof options) {
|
|
cb = options;
|
|
options = {};
|
|
}
|
|
options.visited = {};
|
|
options.relations = false;
|
|
|
|
cb = cb || utils.createPromiseCallback();
|
|
|
|
this.discoverSchemas(tableName, options, function(err, schemas) {
|
|
if (err || !schemas) {
|
|
cb && cb(err, schemas);
|
|
return;
|
|
}
|
|
for (const s in schemas) {
|
|
cb && cb(null, schemas[s]);
|
|
return;
|
|
}
|
|
});
|
|
return cb.promise;
|
|
};
|
|
|
|
/**
|
|
* Discover schema from a given tableName/viewName.
|
|
*
|
|
* @param {String} tableName The table name.
|
|
* @options {Object} [options] Options; see below.
|
|
* @property {String} owner|schema Database owner or schema name.
|
|
* @property {Boolean} relations True if relations (primary key/foreign key) are navigated; false otherwise.
|
|
* @property {Boolean} all True if all owners are included; false otherwise.
|
|
* @property {Boolean} views True if views are included; false otherwise.
|
|
* @param {Function} [cb] The callback function
|
|
* @returns {Promise} A promise object that resolves to an array of schemas.
|
|
*/
|
|
DataSource.prototype.discoverSchemas = function(tableName, options, cb) {
|
|
options = options || {};
|
|
|
|
if (!cb && 'function' === typeof options) {
|
|
cb = options;
|
|
options = {};
|
|
}
|
|
|
|
cb = cb || utils.createPromiseCallback();
|
|
|
|
const self = this;
|
|
const dbType = this.connector.name;
|
|
|
|
let nameMapper;
|
|
if (options.nameMapper === null) {
|
|
// No mapping
|
|
nameMapper = function(type, name) {
|
|
return name;
|
|
};
|
|
} else if (typeof options.nameMapper === 'function') {
|
|
// Custom name mapper
|
|
nameMapper = options.nameMapper;
|
|
} else {
|
|
// Default name mapper
|
|
nameMapper = function mapName(type, name) {
|
|
if (type === 'table' || type === 'model') {
|
|
return fromDBName(name, false);
|
|
} else if (type == 'fk') {
|
|
return fromDBName(name + 'Rel', true);
|
|
} else {
|
|
return fromDBName(name, true);
|
|
}
|
|
};
|
|
}
|
|
|
|
if (this.connector.discoverSchemas) {
|
|
// Delegate to the connector implementation
|
|
this.connector.discoverSchemas(tableName, options, cb);
|
|
return cb.promise;
|
|
}
|
|
|
|
const tasks = [
|
|
this.discoverModelProperties.bind(this, tableName, options),
|
|
this.discoverPrimaryKeys.bind(this, tableName, options)];
|
|
|
|
const followingRelations = options.associations || options.relations;
|
|
if (followingRelations) {
|
|
tasks.push(this.discoverForeignKeys.bind(this, tableName, options));
|
|
}
|
|
|
|
async.parallel(tasks, function(err, results) {
|
|
if (err) {
|
|
cb(err);
|
|
return cb.promise;
|
|
}
|
|
|
|
const columns = results[0];
|
|
if (!columns || columns.length === 0) {
|
|
cb(new Error(g.f('Table \'%s\' does not exist.', tableName)));
|
|
return cb.promise;
|
|
}
|
|
|
|
// Handle primary keys
|
|
const primaryKeys = results[1] || [];
|
|
const pks = {};
|
|
primaryKeys.forEach(function(pk) {
|
|
pks[pk.columnName] = pk.keySeq;
|
|
});
|
|
|
|
if (self.settings.debug) {
|
|
debug('Primary keys: ', pks);
|
|
}
|
|
|
|
const schema = {
|
|
name: nameMapper('table', tableName),
|
|
options: {
|
|
idInjection: false, // DO NOT add id property
|
|
},
|
|
properties: {},
|
|
};
|
|
|
|
schema.options[dbType] = {
|
|
schema: columns[0].owner,
|
|
table: tableName,
|
|
};
|
|
|
|
columns.forEach(function(item) {
|
|
const propName = nameMapper('column', item.columnName);
|
|
schema.properties[propName] = {
|
|
type: item.type,
|
|
required: (item.nullable === 'N' || item.nullable === 'NO' ||
|
|
item.nullable === 0 || item.nullable === false),
|
|
length: item.dataLength,
|
|
precision: item.dataPrecision,
|
|
scale: item.dataScale,
|
|
};
|
|
|
|
if (pks[item.columnName]) {
|
|
schema.properties[propName].id = pks[item.columnName];
|
|
}
|
|
const dbSpecific = schema.properties[propName][dbType] = {
|
|
columnName: item.columnName,
|
|
dataType: item.dataType,
|
|
dataLength: item.dataLength,
|
|
dataPrecision: item.dataPrecision,
|
|
dataScale: item.dataScale,
|
|
nullable: item.nullable,
|
|
};
|
|
// merge connector-specific properties
|
|
if (item[dbType]) {
|
|
for (const k in item[dbType]) {
|
|
dbSpecific[k] = item[dbType][k];
|
|
}
|
|
}
|
|
});
|
|
|
|
// Add current modelName to the visited tables
|
|
options.visited = options.visited || {};
|
|
const schemaKey = columns[0].owner + '.' + tableName;
|
|
if (!options.visited.hasOwnProperty(schemaKey)) {
|
|
if (self.settings.debug) {
|
|
debug('Adding schema for ' + schemaKey);
|
|
}
|
|
options.visited[schemaKey] = schema;
|
|
}
|
|
|
|
const otherTables = {};
|
|
if (followingRelations) {
|
|
// Handle foreign keys
|
|
const fks = {};
|
|
const foreignKeys = results[2] || [];
|
|
foreignKeys.forEach(function(fk) {
|
|
const fkInfo = {
|
|
keySeq: fk.keySeq,
|
|
owner: fk.pkOwner,
|
|
tableName: fk.pkTableName,
|
|
columnName: fk.pkColumnName,
|
|
};
|
|
if (fks[fk.fkName]) {
|
|
fks[fk.fkName].push(fkInfo);
|
|
} else {
|
|
fks[fk.fkName] = [fkInfo];
|
|
}
|
|
});
|
|
|
|
if (self.settings.debug) {
|
|
debug('Foreign keys: ', fks);
|
|
}
|
|
|
|
schema.options.relations = {};
|
|
foreignKeys.forEach(function(fk) {
|
|
const propName = nameMapper('fk', (fk.fkName || fk.pkTableName));
|
|
schema.options.relations[propName] = {
|
|
model: nameMapper('table', fk.pkTableName),
|
|
type: 'belongsTo',
|
|
foreignKey: nameMapper('column', fk.fkColumnName),
|
|
};
|
|
|
|
const key = fk.pkOwner + '.' + fk.pkTableName;
|
|
if (!options.visited.hasOwnProperty(key) && !otherTables.hasOwnProperty(key)) {
|
|
otherTables[key] = {owner: fk.pkOwner, tableName: fk.pkTableName};
|
|
}
|
|
});
|
|
}
|
|
|
|
if (Object.keys(otherTables).length === 0) {
|
|
cb(null, options.visited);
|
|
} else {
|
|
const moreTasks = [];
|
|
for (const t in otherTables) {
|
|
if (self.settings.debug) {
|
|
debug('Discovering related schema for ' + schemaKey);
|
|
}
|
|
const newOptions = {};
|
|
for (const key in options) {
|
|
newOptions[key] = options[key];
|
|
}
|
|
newOptions.owner = otherTables[t].owner;
|
|
|
|
moreTasks.push(DataSource.prototype.discoverSchemas.bind(self, otherTables[t].tableName, newOptions));
|
|
}
|
|
async.parallel(moreTasks, function(err, results) {
|
|
const result = results && results[0];
|
|
cb(err, result);
|
|
});
|
|
}
|
|
});
|
|
return cb.promise;
|
|
};
|
|
|
|
/*! Method will be completely removed in LoopBack.next
|
|
*/
|
|
/**
|
|
* Discover schema from a given table/view synchronously
|
|
* @param {String} modelName The model name
|
|
* @options {Object} [options] Options; see below.
|
|
* @property {String} owner|schema Database owner or schema name.
|
|
* @property {Boolean} relations True if relations (primary key/foreign key) are navigated; false otherwise.
|
|
* @property {Boolean} all True if all owners are included; false otherwise.
|
|
* @property {Boolean} views True if views are included; false otherwise.
|
|
* @returns {Array<Object>} An array of schema definition objects.
|
|
*/
|
|
DataSource.prototype.discoverSchemasSync = function(modelName, options) {
|
|
const self = this;
|
|
const dbType = this.connector.name;
|
|
|
|
const columns = this.discoverModelPropertiesSync(modelName, options);
|
|
if (!columns || columns.length === 0) {
|
|
return [];
|
|
}
|
|
|
|
const nameMapper = options.nameMapper || function mapName(type, name) {
|
|
if (type === 'table' || type === 'model') {
|
|
return fromDBName(name, false);
|
|
} else {
|
|
return fromDBName(name, true);
|
|
}
|
|
};
|
|
|
|
// Handle primary keys
|
|
const primaryKeys = this.discoverPrimaryKeysSync(modelName, options);
|
|
const pks = {};
|
|
primaryKeys.forEach(function(pk) {
|
|
pks[pk.columnName] = pk.keySeq;
|
|
});
|
|
|
|
if (self.settings.debug) {
|
|
debug('Primary keys: ', pks);
|
|
}
|
|
|
|
const schema = {
|
|
name: nameMapper('table', modelName),
|
|
options: {
|
|
idInjection: false, // DO NOT add id property
|
|
},
|
|
properties: {},
|
|
};
|
|
|
|
schema.options[dbType] = {
|
|
schema: columns.length > 0 && columns[0].owner,
|
|
table: modelName,
|
|
};
|
|
|
|
columns.forEach(function(item) {
|
|
const i = item;
|
|
|
|
const propName = nameMapper('column', item.columnName);
|
|
schema.properties[propName] = {
|
|
type: item.type,
|
|
required: (item.nullable === 'N'),
|
|
length: item.dataLength,
|
|
precision: item.dataPrecision,
|
|
scale: item.dataScale,
|
|
};
|
|
|
|
if (pks[item.columnName]) {
|
|
schema.properties[propName].id = pks[item.columnName];
|
|
}
|
|
schema.properties[propName][dbType] = {
|
|
columnName: i.columnName,
|
|
dataType: i.dataType,
|
|
dataLength: i.dataLength,
|
|
dataPrecision: item.dataPrecision,
|
|
dataScale: item.dataScale,
|
|
nullable: i.nullable,
|
|
};
|
|
});
|
|
|
|
// Add current modelName to the visited tables
|
|
options.visited = options.visited || {};
|
|
const schemaKey = columns[0].owner + '.' + modelName;
|
|
if (!options.visited.hasOwnProperty(schemaKey)) {
|
|
if (self.settings.debug) {
|
|
debug('Adding schema for ' + schemaKey);
|
|
}
|
|
options.visited[schemaKey] = schema;
|
|
}
|
|
|
|
const otherTables = {};
|
|
const followingRelations = options.associations || options.relations;
|
|
if (followingRelations) {
|
|
// Handle foreign keys
|
|
const fks = {};
|
|
const foreignKeys = this.discoverForeignKeysSync(modelName, options);
|
|
foreignKeys.forEach(function(fk) {
|
|
const fkInfo = {
|
|
keySeq: fk.keySeq,
|
|
owner: fk.pkOwner,
|
|
tableName: fk.pkTableName,
|
|
columnName: fk.pkColumnName,
|
|
};
|
|
if (fks[fk.fkName]) {
|
|
fks[fk.fkName].push(fkInfo);
|
|
} else {
|
|
fks[fk.fkName] = [fkInfo];
|
|
}
|
|
});
|
|
|
|
if (self.settings.debug) {
|
|
debug('Foreign keys: ', fks);
|
|
}
|
|
|
|
schema.options.relations = {};
|
|
foreignKeys.forEach(function(fk) {
|
|
const propName = nameMapper('column', fk.pkTableName);
|
|
schema.options.relations[propName] = {
|
|
model: nameMapper('table', fk.pkTableName),
|
|
type: 'belongsTo',
|
|
foreignKey: nameMapper('column', fk.fkColumnName),
|
|
};
|
|
|
|
const key = fk.pkOwner + '.' + fk.pkTableName;
|
|
if (!options.visited.hasOwnProperty(key) && !otherTables.hasOwnProperty(key)) {
|
|
otherTables[key] = {owner: fk.pkOwner, tableName: fk.pkTableName};
|
|
}
|
|
});
|
|
}
|
|
|
|
if (Object.keys(otherTables).length === 0) {
|
|
return options.visited;
|
|
} else {
|
|
const moreTasks = [];
|
|
for (const t in otherTables) {
|
|
if (self.settings.debug) {
|
|
debug('Discovering related schema for ' + schemaKey);
|
|
}
|
|
const newOptions = {};
|
|
for (const key in options) {
|
|
newOptions[key] = options[key];
|
|
}
|
|
newOptions.owner = otherTables[t].owner;
|
|
self.discoverSchemasSync(otherTables[t].tableName, newOptions);
|
|
}
|
|
return options.visited;
|
|
}
|
|
};
|
|
|
|
/**
|
|
* Discover and build models from the specified owner/modelName.
|
|
*
|
|
* @param {String} modelName The model name.
|
|
* @options {Object} [options] Options; see below.
|
|
* @property {String} owner|schema Database owner or schema name.
|
|
* @property {Boolean} relations True if relations (primary key/foreign key) are navigated; false otherwise.
|
|
* @property {Boolean} all True if all owners are included; false otherwise.
|
|
* @property {Boolean} views True if views are included; false otherwise.
|
|
* @param {Function} [cb] The callback function
|
|
* @returns {Promise} A Promise object that resolves with a map of model
|
|
* constructors, keyed by model name
|
|
*/
|
|
DataSource.prototype.discoverAndBuildModels = function(modelName, options, cb) {
|
|
const self = this;
|
|
options = options || {};
|
|
this.discoverSchemas(modelName, options, function(err, schemas) {
|
|
if (err) {
|
|
cb && cb(err, schemas);
|
|
return;
|
|
}
|
|
|
|
const schemaList = [];
|
|
for (const s in schemas) {
|
|
const schema = schemas[s];
|
|
if (options.base) {
|
|
schema.options = schema.options || {};
|
|
schema.options.base = options.base;
|
|
}
|
|
schemaList.push(schema);
|
|
}
|
|
|
|
const models = self.modelBuilder.buildModels(schemaList,
|
|
self.createModel.bind(self));
|
|
|
|
cb && cb(err, models);
|
|
});
|
|
};
|
|
|
|
/*! Method will be completely removed in LoopBack.next
|
|
*/
|
|
/**
|
|
* Discover and build models from the given owner/modelName synchronously.
|
|
* @param {String} modelName The model name.
|
|
* @options {Object} [options] Options; see below.
|
|
* @property {String} owner|schema Database owner or schema name.
|
|
* @property {Boolean} relations True if relations (primary key/foreign key) are navigated; false otherwise.
|
|
* @property {Boolean} all True if all owners are included; false otherwise.
|
|
* @property {Boolean} views True if views are included; false otherwise.
|
|
|
|
* @param {String} modelName The model name
|
|
* @param {Object} [options] The options
|
|
* @returns {Object} A map of model constructors, keyed by model name
|
|
*/
|
|
DataSource.prototype.discoverAndBuildModelsSync = function(modelName, options) {
|
|
options = options || {};
|
|
const schemas = this.discoverSchemasSync(modelName, options);
|
|
|
|
const schemaList = [];
|
|
for (const s in schemas) {
|
|
const schema = schemas[s];
|
|
if (options.base) {
|
|
schema.options = schema.options || {};
|
|
schema.options.base = options.base;
|
|
}
|
|
schemaList.push(schema);
|
|
}
|
|
|
|
const models = this.modelBuilder.buildModels(schemaList,
|
|
this.createModel.bind(this));
|
|
|
|
return models;
|
|
};
|
|
|
|
/**
|
|
* Introspect a JSON object and build a model class
|
|
* @param {String} name Name of the model
|
|
* @param {Object} json The json object representing a model instance
|
|
* @param {Object} options Options
|
|
* @returns {Model} A Model class
|
|
*/
|
|
DataSource.prototype.buildModelFromInstance = function(name, json, options) {
|
|
// Introspect the JSON document to generate a schema
|
|
const schema = ModelBuilder.introspect(json);
|
|
|
|
// Create a model for the generated schema
|
|
return this.createModel(name, schema, options);
|
|
};
|
|
|
|
/**
|
|
* Check whether or not migrations are required for the database schema to match
|
|
* the Model definitions attached to the DataSource.
|
|
* Note: This method applies only to SQL connectors.
|
|
* @param {String|String[]} [models] A model name or an array of model names. If not present, apply to all models.
|
|
* @returns {Boolean} Whether or not migrations are required.
|
|
*/
|
|
DataSource.prototype.isActual = function(models, cb) {
|
|
this.freeze();
|
|
if (this.connector.isActual) {
|
|
this.connector.isActual(models, cb);
|
|
} else {
|
|
if ((!cb) && ('function' === typeof models)) {
|
|
cb = models;
|
|
models = undefined;
|
|
}
|
|
if (cb) {
|
|
process.nextTick(function() {
|
|
cb(null, true);
|
|
});
|
|
}
|
|
}
|
|
};
|
|
|
|
/**
|
|
* Log benchmarked message. Do not redefine this method, if you need to grab
|
|
* schema logs, use `dataSource.on('log', ...)` emitter event
|
|
*
|
|
* @private used by connectors
|
|
*/
|
|
DataSource.prototype.log = function(sql, t) {
|
|
debug(sql, t);
|
|
this.emit('log', sql, t);
|
|
};
|
|
|
|
/**
|
|
* Freeze dataSource. Behavior depends on connector
|
|
* To continuously add artifacts to datasource until it is frozen, but it is not really used in loopback.
|
|
*/
|
|
DataSource.prototype.freeze = function freeze() {
|
|
if (!this.connector) {
|
|
throw new Error(g.f('The connector has not been initialized.'));
|
|
}
|
|
if (this.connector.freezeDataSource) {
|
|
this.connector.freezeDataSource();
|
|
}
|
|
if (this.connector.freezeSchema) {
|
|
this.connector.freezeSchema();
|
|
}
|
|
};
|
|
|
|
/**
|
|
* Return table name for specified `modelName`.
|
|
* @param {String} modelName The model name.
|
|
* @returns {String} The table name.
|
|
*/
|
|
DataSource.prototype.tableName = function(modelName) {
|
|
return this.getModelDefinition(modelName).tableName(this.connector.name);
|
|
};
|
|
|
|
/**
|
|
* Return column name for specified modelName and propertyName
|
|
* @param {String} modelName The model name
|
|
* @param {String} propertyName The property name
|
|
* @returns {String} columnName The column name.
|
|
*/
|
|
DataSource.prototype.columnName = function(modelName, propertyName) {
|
|
return this.getModelDefinition(modelName).columnName(this.connector.name, propertyName);
|
|
};
|
|
|
|
/**
|
|
* Return column metadata for specified modelName and propertyName
|
|
* @param {String} modelName The model name
|
|
* @param {String} propertyName The property name
|
|
* @returns {Object} column metadata
|
|
*/
|
|
DataSource.prototype.columnMetadata = function(modelName, propertyName) {
|
|
return this.getModelDefinition(modelName).columnMetadata(this.connector.name, propertyName);
|
|
};
|
|
|
|
/**
|
|
* Return column names for specified modelName
|
|
* @param {String} modelName The model name
|
|
* @returns {String[]} column names
|
|
*/
|
|
DataSource.prototype.columnNames = function(modelName) {
|
|
return this.getModelDefinition(modelName).columnNames(this.connector.name);
|
|
};
|
|
|
|
/**
|
|
* Find the ID column name
|
|
* @param {String} modelName The model name
|
|
* @returns {String} columnName for ID
|
|
*/
|
|
DataSource.prototype.idColumnName = function(modelName) {
|
|
return this.getModelDefinition(modelName).idColumnName(this.connector.name);
|
|
};
|
|
|
|
/**
|
|
* Find the ID property name
|
|
* @param {String} modelName The model name
|
|
* @returns {String} property name for ID
|
|
*/
|
|
DataSource.prototype.idName = function(modelName) {
|
|
if (!this.getModelDefinition(modelName).idName) {
|
|
g.error('No {{id}} name %s', this.getModelDefinition(modelName));
|
|
}
|
|
return this.getModelDefinition(modelName).idName();
|
|
};
|
|
|
|
/**
|
|
* Find the ID property names sorted by the index
|
|
* @param {String} modelName The model name
|
|
* @returns {String[]} property names for IDs
|
|
*/
|
|
DataSource.prototype.idNames = function(modelName) {
|
|
return this.getModelDefinition(modelName).idNames();
|
|
};
|
|
|
|
/**
|
|
* Find the id property definition
|
|
* @param {String} modelName The model name
|
|
* @returns {Object} The id property definition
|
|
*/
|
|
DataSource.prototype.idProperty = function(modelName) {
|
|
const def = this.getModelDefinition(modelName);
|
|
const idProps = def && def.ids();
|
|
return idProps && idProps[0] && idProps[0].property;
|
|
};
|
|
|
|
/**
|
|
* Define foreign key to another model
|
|
* @param {String} className The model name that owns the key
|
|
* @param {String} key Name of key field
|
|
* @param {String} foreignClassName The foreign model name
|
|
* @param {String} pkName (optional) primary key used for foreignKey
|
|
*/
|
|
DataSource.prototype.defineForeignKey = function defineForeignKey(className, key, foreignClassName, pkName) {
|
|
let pkType = null;
|
|
const foreignModel = this.getModelDefinition(foreignClassName);
|
|
pkName = pkName || foreignModel && foreignModel.idName();
|
|
if (pkName) {
|
|
pkType = foreignModel.properties[pkName].type;
|
|
}
|
|
const model = this.getModelDefinition(className);
|
|
if (model.properties[key]) {
|
|
if (pkType) {
|
|
// Reset the type of the foreign key
|
|
model.rawProperties[key].type = model.properties[key].type = pkType;
|
|
}
|
|
return;
|
|
}
|
|
|
|
const fkDef = {type: pkType};
|
|
const foreignMeta = this.columnMetadata(foreignClassName, pkName);
|
|
if (foreignMeta && (foreignMeta.dataType || foreignMeta.dataLength)) {
|
|
fkDef[this.connector.name] = {};
|
|
if (foreignMeta.dataType) {
|
|
fkDef[this.connector.name].dataType = foreignMeta.dataType;
|
|
}
|
|
if (foreignMeta.dataLength) {
|
|
fkDef[this.connector.name].dataLength = foreignMeta.dataLength;
|
|
}
|
|
}
|
|
if (this.connector.defineForeignKey) {
|
|
const cb = function(err, keyType) {
|
|
if (err) throw err;
|
|
fkDef.type = keyType || pkType;
|
|
// Add the foreign key property to the data source _models
|
|
this.defineProperty(className, key, fkDef);
|
|
}.bind(this);
|
|
switch (this.connector.defineForeignKey.length) {
|
|
case 4:
|
|
this.connector.defineForeignKey(className, key, foreignClassName, cb);
|
|
break;
|
|
default:
|
|
case 3:
|
|
this.connector.defineForeignKey(className, key, cb);
|
|
break;
|
|
}
|
|
} else {
|
|
// Add the foreign key property to the data source _models
|
|
this.defineProperty(className, key, fkDef);
|
|
}
|
|
};
|
|
|
|
/**
|
|
* Close connection to the DataSource.
|
|
* @param {Function} [cb] The callback function. Optional.
|
|
*/
|
|
DataSource.prototype.disconnect = function disconnect(cb) {
|
|
cb = cb || utils.createPromiseCallback();
|
|
const self = this;
|
|
if (this.connected && (typeof this.connector.disconnect === 'function')) {
|
|
this.connector.disconnect(function(err, result) {
|
|
self.connected = false;
|
|
cb && cb(err, result);
|
|
});
|
|
} else {
|
|
process.nextTick(function() {
|
|
self.connected = false;
|
|
cb && cb();
|
|
});
|
|
}
|
|
return cb.promise;
|
|
};
|
|
|
|
/**
|
|
* Copy the model from Master.
|
|
* @param {Function} Master The model constructor
|
|
* @returns {Model} A copy of the Model object constructor
|
|
*
|
|
* @private
|
|
*/
|
|
DataSource.prototype.copyModel = function copyModel(Master) {
|
|
const dataSource = this;
|
|
const className = Master.modelName;
|
|
const md = Master.modelBuilder.getModelDefinition(className);
|
|
const Slave = function SlaveModel() {
|
|
Master.apply(this, [].slice.call(arguments));
|
|
};
|
|
|
|
util.inherits(Slave, Master);
|
|
|
|
// Delegating static properties
|
|
Slave.__proto__ = Master;
|
|
|
|
hiddenProperty(Slave, 'dataSource', dataSource);
|
|
hiddenProperty(Slave, 'modelName', className);
|
|
hiddenProperty(Slave, 'relations', Master.relations);
|
|
|
|
if (!(className in dataSource.modelBuilder.models)) {
|
|
// store class in model pool
|
|
dataSource.modelBuilder.models[className] = Slave;
|
|
dataSource.modelBuilder.definitions[className] =
|
|
new ModelDefinition(dataSource.modelBuilder, md.name, md.properties, md.settings);
|
|
|
|
if ((!dataSource.isTransaction) && dataSource.connector && dataSource.connector.define) {
|
|
dataSource.connector.define({
|
|
model: Slave,
|
|
properties: md.properties,
|
|
settings: md.settings,
|
|
});
|
|
}
|
|
}
|
|
|
|
return Slave;
|
|
};
|
|
|
|
/**
|
|
* Run a transaction against the DataSource.
|
|
*
|
|
* This method can be used in different ways based on the passed arguments and
|
|
* type of underlying data source:
|
|
*
|
|
* If no `execute()` function is provided and the underlying DataSource is a
|
|
* database that supports transactions, a Promise is returned that resolves to
|
|
* an EventEmitter representing the transaction once it is ready.
|
|
* `transaction.models` can be used to receive versions of the DataSource's
|
|
* model classes which are bound to the created transaction, so that all their
|
|
* database methods automatically use the transaction. At the end of all
|
|
* database transactions, `transaction.commit()` can be called to commit the
|
|
* transactions, or `transaction.rollback()` to roll them back.
|
|
*
|
|
* If no `execute()` function is provided on a transient or memory DataSource,
|
|
* the EventEmitter representing the transaction is returned immediately. For
|
|
* backward compatibility, this object also supports `transaction.exec()`
|
|
* instead of `transaction.commit()`, and calling `transaction.rollback()` is
|
|
* not required on such transient and memory DataSource instances.
|
|
*
|
|
* If an `execute()` function is provided, then it is called as soon as the
|
|
* transaction is ready, receiving `transaction.models` as its first
|
|
* argument. `transaction.commit()` and `transaction.rollback()` are then
|
|
* automatically called at the end of `execute()`, based on whether exceptions
|
|
* happen during execution or not. If no callback is provided to be called at
|
|
* the end of the execution, a Promise object is returned that is resolved or
|
|
* rejected as soon as the execution is completed, and the transaction is
|
|
* committed or rolled back.
|
|
*
|
|
* @param {Function} execute The execute function, called with (models). Note
|
|
* that the instances in `models` are bound to the created transaction, and
|
|
* are therefore not identical with the models in `app.models`, but slaves
|
|
* thereof (optional).
|
|
* @options {Object} options The options to be passed to `beginTransaction()`
|
|
* when creating the transaction on database sources (optional).
|
|
* @param {Function} cb Callback called with (err)
|
|
* @returns {Promise | EventEmitter}
|
|
*/
|
|
DataSource.prototype.transaction = function(execute, options, cb) {
|
|
if (cb === undefined && typeof options === 'function') {
|
|
cb = options;
|
|
options = {};
|
|
} else {
|
|
options = options || {};
|
|
}
|
|
|
|
const dataSource = this;
|
|
const transaction = new EventEmitter();
|
|
|
|
for (const p in dataSource) {
|
|
transaction[p] = dataSource[p];
|
|
}
|
|
|
|
transaction.isTransaction = true;
|
|
transaction.origin = dataSource;
|
|
transaction.connected = false;
|
|
transaction.connecting = false;
|
|
|
|
// Don't allow creating transactions on a transaction data-source:
|
|
transaction.transaction = function() {
|
|
throw new Error(g.f('Nesting transactions is not supported'));
|
|
};
|
|
|
|
// Create a blank pool for the slave models bound to this transaction.
|
|
const modelBuilder = new ModelBuilder();
|
|
const slaveModels = modelBuilder.models;
|
|
transaction.modelBuilder = modelBuilder;
|
|
transaction.models = slaveModels;
|
|
transaction.definitions = modelBuilder.definitions;
|
|
|
|
// For performance reasons, use a getter per model and only call copyModel()
|
|
// for the models that are actually used. These getters are then replaced
|
|
// with the actual values on first use.
|
|
const masterModels = dataSource.modelBuilder.models;
|
|
Object.keys(masterModels).forEach(function(name) {
|
|
Object.defineProperty(slaveModels, name, {
|
|
enumerable: true,
|
|
configurable: true,
|
|
get: function() {
|
|
// Delete getter so copyModel() can redefine slaveModels[name].
|
|
// NOTE: No need to set the new value as copyModel() takes care of it.
|
|
delete slaveModels[name];
|
|
return dataSource.copyModel.call(transaction, masterModels[name]);
|
|
},
|
|
});
|
|
});
|
|
|
|
let done = function(err) {
|
|
if (err) {
|
|
transaction.rollback(function(error) {
|
|
cb(err || error);
|
|
});
|
|
} else {
|
|
transaction.commit(cb);
|
|
}
|
|
// Make sure cb() isn't called twice, e.g. if `execute` returns a
|
|
// thenable object and also calls the passed `cb` function.
|
|
done = function() {};
|
|
};
|
|
|
|
function handleExecute() {
|
|
if (execute) {
|
|
cb = cb || utils.createPromiseCallback();
|
|
try {
|
|
const result = execute(slaveModels, done);
|
|
if (result && typeof result.then === 'function') {
|
|
result.then(function() { done(); }, done);
|
|
}
|
|
} catch (err) {
|
|
done(err);
|
|
}
|
|
return cb.promise;
|
|
} else if (cb) {
|
|
cb(null, transaction);
|
|
} else {
|
|
return transaction;
|
|
}
|
|
}
|
|
|
|
function transactionCreated(err, tx) {
|
|
if (err) {
|
|
cb(err);
|
|
} else {
|
|
// Expose transaction on the created transaction dataSource so it can be
|
|
// retrieved again in determineOptions() in dao.js, as well as referenced
|
|
// in transaction.commit() and transaction.rollback() below.
|
|
transaction.currentTransaction = tx;
|
|
|
|
// Some connectors like Postgresql expose loobpack-connector as a property on the tx
|
|
if (!tx.observe && tx.connector) {
|
|
tx = tx.connector;
|
|
}
|
|
// Handle timeout and pass it on as an error.
|
|
tx.observe('timeout', function(context, next) {
|
|
const err = new Error(g.f('Transaction is rolled back due to timeout'));
|
|
err.code = 'TRANSACTION_TIMEOUT';
|
|
// Pass on the error to next(), so that the final 'timeout' observer in
|
|
// loopback-connector does not trigger a rollback by itself that we
|
|
// can't get a callback for when it's finished.
|
|
next(err);
|
|
// Call done(err) after, to execute the rollback here and reject the
|
|
// promise with the error when it's completed.
|
|
done(err);
|
|
});
|
|
handleExecute();
|
|
}
|
|
}
|
|
|
|
function ensureTransaction(transaction, cb) {
|
|
if (!transaction) {
|
|
process.nextTick(function() {
|
|
cb(new Error(g.f(
|
|
'Transaction is not ready, wait for the returned promise to resolve',
|
|
)));
|
|
});
|
|
}
|
|
return transaction;
|
|
}
|
|
|
|
const connector = dataSource.connector;
|
|
if (connector.transaction) {
|
|
// Create a transient or memory source transaction.
|
|
transaction.connector = connector.transaction();
|
|
transaction.commit =
|
|
transaction.exec = function(cb) {
|
|
this.connector.exec(cb);
|
|
};
|
|
transaction.rollback = function(cb) {
|
|
// No need to do anything here.
|
|
cb();
|
|
};
|
|
return handleExecute();
|
|
} else if (connector.beginTransaction) {
|
|
// Create a database source transaction.
|
|
transaction.exec =
|
|
transaction.commit = function(cb) {
|
|
ensureTransaction(this.currentTransaction, cb).commit(cb);
|
|
};
|
|
transaction.rollback = function(cb) {
|
|
ensureTransaction(this.currentTransaction, cb).rollback(cb);
|
|
};
|
|
// Always use callback / promise due to the use of beginTransaction()
|
|
cb = cb || utils.createPromiseCallback();
|
|
Transaction.begin(connector, options, transactionCreated);
|
|
return cb.promise;
|
|
} else {
|
|
throw new Error(g.f('DataSource does not support transactions'));
|
|
}
|
|
};
|
|
|
|
/**
|
|
* Enable remote access to a data source operation. Each [connector](#connector) has its own set of set
|
|
* remotely enabled and disabled operations. To list the operations, call `dataSource.operations()`.
|
|
* @param {String} operation The operation name
|
|
*/
|
|
|
|
DataSource.prototype.enableRemote = function(operation) {
|
|
const op = this.getOperation(operation);
|
|
if (op) {
|
|
op.remoteEnabled = true;
|
|
} else {
|
|
throw new Error(g.f('%s is not provided by the attached connector', operation));
|
|
}
|
|
};
|
|
|
|
/**
|
|
* Disable remote access to a data source operation. Each [connector](#connector) has its own set of set enabled
|
|
* and disabled operations. To list the operations, call `dataSource.operations()`.
|
|
*
|
|
*```js
|
|
* var oracle = loopback.createDataSource({
|
|
* connector: require('loopback-connector-oracle'),
|
|
* host: '...',
|
|
* ...
|
|
* });
|
|
* oracle.disableRemote('destroyAll');
|
|
* ```
|
|
* **Notes:**
|
|
*
|
|
* - Disabled operations will not be added to attached models.
|
|
* - Disabling the remoting for a method only affects client access (it will still be available from server models).
|
|
* - Data sources must enable / disable operations before attaching or creating models.
|
|
* @param {String} operation The operation name
|
|
*/
|
|
|
|
DataSource.prototype.disableRemote = function(operation) {
|
|
const op = this.getOperation(operation);
|
|
if (op) {
|
|
op.remoteEnabled = false;
|
|
} else {
|
|
throw new Error(g.f('%s is not provided by the attached connector', operation));
|
|
}
|
|
};
|
|
|
|
/**
|
|
* Get an operation's metadata.
|
|
* @param {String} operation The operation name
|
|
*/
|
|
|
|
DataSource.prototype.getOperation = function(operation) {
|
|
const ops = this.operations();
|
|
const opKeys = Object.keys(ops);
|
|
|
|
for (let i = 0; i < opKeys.length; i++) {
|
|
const op = ops[opKeys[i]];
|
|
|
|
if (op.name === operation) {
|
|
return op;
|
|
}
|
|
}
|
|
};
|
|
|
|
/**
|
|
* Return JSON object describing all operations.
|
|
*
|
|
* Example return value:
|
|
* ```js
|
|
* {
|
|
* find: {
|
|
* remoteEnabled: true,
|
|
* accepts: [...],
|
|
* returns: [...]
|
|
* enabled: true
|
|
* },
|
|
* save: {
|
|
* remoteEnabled: true,
|
|
* prototype: true,
|
|
* accepts: [...],
|
|
* returns: [...],
|
|
* enabled: true
|
|
* },
|
|
* ...
|
|
* }
|
|
* ```
|
|
*/
|
|
DataSource.prototype.operations = function() {
|
|
return this._operations;
|
|
};
|
|
|
|
/**
|
|
* Define an operation to the data source
|
|
* @param {String} name The operation name
|
|
* @param {Object} options The options
|
|
* @param {Function} fn The function
|
|
*/
|
|
DataSource.prototype.defineOperation = function(name, options, fn) {
|
|
options.fn = fn;
|
|
options.name = name;
|
|
this._operations[name] = options;
|
|
};
|
|
|
|
/**
|
|
* Check if the backend is a relational DB
|
|
* @returns {Boolean}
|
|
*/
|
|
DataSource.prototype.isRelational = function() {
|
|
return this.connector && this.connector.relational;
|
|
};
|
|
|
|
/**
|
|
* Check if the data source is connected. If not, the method invocation will be
|
|
* deferred and queued.
|
|
*
|
|
*
|
|
* @param {Object} obj Receiver for the method call
|
|
* @param {Object} args Arguments passing to the method call
|
|
* @returns - a Boolean value to indicate if the method invocation is deferred.
|
|
* false: The datasource is already connected
|
|
* - true: The datasource is yet to be connected
|
|
*/
|
|
DataSource.prototype.queueInvocation = DataSource.prototype.ready =
|
|
function(obj, args) {
|
|
const self = this;
|
|
debug('Datasource %s: connected=%s connecting=%s', this.name,
|
|
this.connected, this.connecting);
|
|
if (this.connected) {
|
|
// Connected
|
|
return false;
|
|
}
|
|
|
|
this._queuedInvocations++;
|
|
|
|
const method = args.callee;
|
|
// Set up a callback after the connection is established to continue the method call
|
|
|
|
let onConnected = null, onError = null, timeoutHandle = null;
|
|
onConnected = function() {
|
|
debug('Datasource %s is now connected - executing method %s', self.name, method.name);
|
|
this._queuedInvocations--;
|
|
// Remove the error handler
|
|
self.removeListener('error', onError);
|
|
if (timeoutHandle) {
|
|
clearTimeout(timeoutHandle);
|
|
}
|
|
const params = [].slice.call(args);
|
|
try {
|
|
method.apply(obj, params);
|
|
} catch (err) {
|
|
// Catch the exception and report it via callback
|
|
const cb = params.pop();
|
|
if (typeof cb === 'function') {
|
|
process.nextTick(function() {
|
|
cb(err);
|
|
});
|
|
} else {
|
|
throw err;
|
|
}
|
|
}
|
|
};
|
|
onError = function(err) {
|
|
debug('Datasource %s fails to connect - aborting method %s', self.name, method.name);
|
|
this._queuedInvocations--;
|
|
// Remove the connected listener
|
|
self.removeListener('connected', onConnected);
|
|
if (timeoutHandle) {
|
|
clearTimeout(timeoutHandle);
|
|
}
|
|
const params = [].slice.call(args);
|
|
const cb = params.pop();
|
|
if (typeof cb === 'function') {
|
|
process.nextTick(function() {
|
|
cb(err);
|
|
});
|
|
}
|
|
};
|
|
this.once('connected', onConnected);
|
|
this.once('error', onError);
|
|
|
|
// Set up a timeout to cancel the invocation
|
|
const timeout = this.settings.connectionTimeout || 5000;
|
|
timeoutHandle = setTimeout(function() {
|
|
debug('Datasource %s fails to connect due to timeout - aborting method %s',
|
|
self.name, method.name);
|
|
this._queuedInvocations--;
|
|
self.connecting = false;
|
|
self.removeListener('error', onError);
|
|
self.removeListener('connected', onConnected);
|
|
const params = [].slice.call(args);
|
|
const cb = params.pop();
|
|
if (typeof cb === 'function') {
|
|
cb(new Error(g.f('Timeout in connecting after %s ms', timeout)));
|
|
}
|
|
}, timeout);
|
|
|
|
if (!this.connecting) {
|
|
debug('Connecting datasource %s to connector %s', this.name, this.connector.name);
|
|
// When no callback is provided to `connect()`, it returns a Promise.
|
|
// We are not handling that promise and thus UnhandledPromiseRejection
|
|
// warning is triggered when the connection could not be established.
|
|
// We are avoiding this problem by providing a no-op callback.
|
|
this.connect(() => {});
|
|
}
|
|
return true;
|
|
};
|
|
|
|
/**
|
|
* Ping the underlying connector to test the connections
|
|
* @param {Function} [cb] Callback function
|
|
*/
|
|
DataSource.prototype.ping = function(cb) {
|
|
cb = cb || utils.createPromiseCallback();
|
|
const self = this;
|
|
if (self.connector.ping) {
|
|
this.connector.ping(cb);
|
|
} else if (self.connector.discoverModelProperties) {
|
|
self.discoverModelProperties('dummy', {}, cb);
|
|
} else {
|
|
process.nextTick(function() {
|
|
const err = self.connected ? null : new Error(g.f('Not connected'));
|
|
cb(err);
|
|
});
|
|
}
|
|
return cb.promise;
|
|
};
|
|
|
|
/**
|
|
* Execute an arbitrary command. The commands are connector specific,
|
|
* please refer to the documentation of your connector for more details.
|
|
*
|
|
* @param command String|Object The command to execute, e.g. an SQL query.
|
|
* @param [args] Array Parameters values to set in the command.
|
|
* @param [options] Object Additional options, e.g. the transaction to use.
|
|
* @returns Promise A promise of the result
|
|
*/
|
|
DataSource.prototype.execute = function(command, args = [], options = {}) {
|
|
assert(typeof command === 'string' || typeof command === 'object',
|
|
'"command" must be a string or an object.');
|
|
assert(typeof args === 'object',
|
|
'"args" must be an object, an array or undefined.');
|
|
assert(typeof options === 'object',
|
|
'"options" must be an object or undefined.');
|
|
|
|
if (!this.connector) {
|
|
return Promise.reject(errorNotImplemented(
|
|
`DataSource "${this.name}" is missing a connector to execute the command.`,
|
|
));
|
|
}
|
|
|
|
if (!this.connector.execute) {
|
|
return Promise.reject(new errorNotImplemented(
|
|
`The connector "${this.connector.name}" used by dataSource "${this.name}" ` +
|
|
'does not implement "execute()" API.',
|
|
));
|
|
}
|
|
|
|
return new Promise((resolve, reject) => {
|
|
this.connector.execute(command, args, options, onExecuted);
|
|
function onExecuted(err, result) {
|
|
if (err) return reject(err);
|
|
if (arguments.length > 2) {
|
|
result = Array.prototype.slice.call(arguments, 1);
|
|
}
|
|
resolve(result);
|
|
}
|
|
});
|
|
|
|
function errorNotImplemented(msg) {
|
|
const err = new Error(msg);
|
|
err.code = 'NOT_IMPLEMENTED';
|
|
return err;
|
|
}
|
|
};
|
|
|
|
/**
|
|
* Begin a new Transaction.
|
|
*
|
|
*
|
|
* @param [options] Options {isolationLevel: '...', timeout: 1000}
|
|
* @returns Promise A promise which resolves to a Transaction object
|
|
*/
|
|
DataSource.prototype.beginTransaction = function(options) {
|
|
return Transaction.begin(this.connector, options);
|
|
};
|
|
|
|
/**
|
|
* Get the maximum number of event listeners
|
|
*/
|
|
DataSource.prototype.getMaxOfflineRequests = function() {
|
|
// Set max listeners to a default value
|
|
// Override this default value with a datasource setting
|
|
// 'maxOfflineRequests' from an application's datasources.json
|
|
|
|
let maxOfflineRequests = DataSource.DEFAULT_MAX_OFFLINE_REQUESTS;
|
|
if (
|
|
this.settings &&
|
|
this.settings.maxOfflineRequests
|
|
) {
|
|
if (typeof this.settings.maxOfflineRequests !== 'number')
|
|
throw new Error('maxOfflineRequests must be a number');
|
|
|
|
maxOfflineRequests = this.settings.maxOfflineRequests;
|
|
}
|
|
return maxOfflineRequests;
|
|
};
|
|
|
|
/*! The hidden property call is too expensive so it is not used that much
|
|
*/
|
|
/**
|
|
* Define a hidden property
|
|
* It is an utility to define a property to the Object with info flags
|
|
* @param {Object} obj The property owner
|
|
* @param {String} key The property name
|
|
* @param {Mixed} value The default value
|
|
*/
|
|
function hiddenProperty(obj, key, value) {
|
|
Object.defineProperty(obj, key, {
|
|
writable: false,
|
|
enumerable: false,
|
|
configurable: false,
|
|
value: value,
|
|
});
|
|
}
|
|
|
|
/**
|
|
* Define readonly property on object
|
|
*
|
|
* @param {Object} obj The property owner
|
|
* @param {String} key The property name
|
|
* @param {Mixed} value The default value
|
|
*/
|
|
function defineReadonlyProp(obj, key, value) {
|
|
Object.defineProperty(obj, key, {
|
|
writable: false,
|
|
enumerable: true,
|
|
configurable: true,
|
|
value: value,
|
|
});
|
|
}
|
|
|
|
// Carry over a few properties/methods from the ModelBuilder as some tests use them
|
|
DataSource.Text = ModelBuilder.Text;
|
|
DataSource.JSON = ModelBuilder.JSON;
|
|
DataSource.Any = ModelBuilder.Any;
|