584 lines
18 KiB
JavaScript
584 lines
18 KiB
JavaScript
/*!
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* Module dependencies
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*/
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var inflection = require('inflection');
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var EventEmitter = require('events').EventEmitter;
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var util = require('util');
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var DefaultModelBaseClass = require('./model.js');
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var List = require('./list.js');
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var ModelDefinition = require('./model-definition.js');
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// Set up types
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require('./types')(ModelBuilder);
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var introspect = require('./introspection')(ModelBuilder);
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/**
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* Export public API
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*/
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exports.ModelBuilder = exports.Schema = ModelBuilder;
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/*!
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* Helpers
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*/
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var slice = Array.prototype.slice;
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/**
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* ModelBuilder - A builder to define data models
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*
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* @constructor
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*/
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function ModelBuilder() {
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// create blank models pool
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/**
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* @property {Object} models Model constructors
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*/
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this.models = {};
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/**
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* @property {Object} definitions Definitions of the models
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*/
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this.definitions = {};
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}
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// Inherit from EventEmitter
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util.inherits(ModelBuilder, EventEmitter);
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// Create a default instance
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ModelBuilder.defaultInstance = new ModelBuilder();
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/**
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* Define a model class
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*
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* @param {String} className
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* @param {Object} properties - hash of class properties in format
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* `{property: Type, property2: Type2, ...}`
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* or
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* `{property: {type: Type}, property2: {type: Type2}, ...}`
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* @param {Object} settings - other configuration of class
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* @return newly created class
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*
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* @example simple case
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* ```
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* var User = dataSource.define('User', {
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* email: String,
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* password: String,
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* birthDate: Date,
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* activated: Boolean
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* });
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* ```
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* @example more advanced case
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* ```
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* var User = dataSource.define('User', {
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* email: { type: String, limit: 150, index: true },
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* password: { type: String, limit: 50 },
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* birthDate: Date,
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* registrationDate: {type: Date, default: function () { return new Date }},
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* activated: { type: Boolean, default: false }
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* });
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* ```
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*/
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ModelBuilder.prototype.define = function defineClass(className, properties, settings, parent) {
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var dataSource = this;
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var args = slice.call(arguments);
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var pluralName = settings && settings.plural;
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var ModelBaseClass = parent || DefaultModelBaseClass;
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if (!className) {
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throw new Error('Class name required');
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}
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if (args.length === 1) {
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properties = {};
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args.push(properties);
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}
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if (args.length === 2) {
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settings = {};
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args.push(settings);
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}
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properties = properties || {};
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settings = settings || {};
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// Set the strict mode to be false by default
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if(settings.strict === undefined || settings.strict === null) {
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settings.strict = false;
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}
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// Check if there is a unresolved model with the same name
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var ModelClass = this.models[className];
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// Create the ModelClass if it doesn't exist or it's resolved (override)
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// TODO: [rfeng] We need to decide what names to use for built-in models such as User.
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if(!ModelClass || !ModelClass.settings.unresolved) {
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// every class can receive hash of data as optional param
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ModelClass = function ModelConstructor(data, dataSource) {
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if(!(this instanceof ModelConstructor)) {
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return new ModelConstructor(data, dataSource);
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}
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if(ModelClass.settings.unresolved) {
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throw new Error('Model ' + ModelClass.modelName + ' is not defined.');
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}
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ModelBaseClass.apply(this, arguments);
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if(dataSource) {
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hiddenProperty(this, '__dataSource', dataSource);
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}
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};
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// mix in EventEmitter (don't inherit from)
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var events = new EventEmitter();
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for (var f in EventEmitter.prototype) {
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if (typeof EventEmitter.prototype[f] === 'function') {
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ModelClass[f] = events[f].bind(events);
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}
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}
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util.inherits(ModelClass, ModelBaseClass);
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hiddenProperty(ModelClass, 'modelName', className);
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}
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// store class in model pool
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this.models[className] = ModelClass;
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// Return the unresolved model
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if(settings.unresolved) {
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ModelClass.settings = {unresolved: true};
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return ModelClass;
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}
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// Add metadata to the ModelClass
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hiddenProperty(ModelClass, 'dataSource', dataSource);
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hiddenProperty(ModelClass, 'schema', dataSource); // For backward compatibility
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hiddenProperty(ModelClass, 'pluralModelName', pluralName || inflection.pluralize(className));
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hiddenProperty(ModelClass, 'relations', {});
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// inherit ModelBaseClass static methods
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for (var i in ModelBaseClass) {
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if(i !== '_mixins') {
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ModelClass[i] = ModelBaseClass[i];
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}
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}
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ModelClass.getter = {};
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ModelClass.setter = {};
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var modelDefinition = new ModelDefinition(this, className, properties, settings);
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this.definitions[className] = modelDefinition;
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// expose properties on the ModelClass
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ModelClass.definition = modelDefinition;
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// keep a pointer to settings as models can use it for configuration
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ModelClass.settings = modelDefinition.settings;
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var idInjection = settings.idInjection;
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if(idInjection !== false) {
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// Default to true if undefined
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idInjection = true;
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}
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var idNames = modelDefinition.idNames();
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if(idNames.length > 0) {
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// id already exists
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idInjection = false;
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}
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// Add the id property
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if (idInjection) {
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// Set up the id property
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ModelClass.definition.defineProperty('id', { type: Number, id: 1, generated: true });
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}
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idNames = modelDefinition.idNames(); // Reload it after rebuild
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// Create a virtual property 'id'
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if (idNames.length === 1) {
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var idProp = idNames[0];
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if (idProp !== 'id') {
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Object.defineProperty(ModelClass.prototype, 'id', {
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get: function () {
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var idProp = ModelClass.definition.idNames[0];
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return this.__data[idProp];
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},
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configurable: true,
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enumerable: false
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});
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}
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} else {
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// Now the id property is an object that consists of multiple keys
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Object.defineProperty(ModelClass.prototype, 'id', {
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get: function () {
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var compositeId = {};
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var idNames = ModelClass.definition.idNames();
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for (var p in idNames) {
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compositeId[p] = this.__data[p];
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}
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return compositeId;
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},
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configurable: true,
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enumerable: false
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});
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}
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// A function to loop through the properties
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ModelClass.forEachProperty = function (cb) {
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Object.keys(ModelClass.definition.properties).forEach(cb);
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};
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// A function to attach the model class to a data source
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ModelClass.attachTo = function (dataSource) {
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dataSource.attach(this);
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};
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// A function to extend the model
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ModelClass.extend = function (className, subclassProperties, subclassSettings) {
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var properties = ModelClass.definition.properties;
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var settings = ModelClass.definition.settings;
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subclassProperties = subclassProperties || {};
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subclassSettings = subclassSettings || {};
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// Check if subclass redefines the ids
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var idFound = false;
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for(var k in subclassProperties) {
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if(subclassProperties[k].id) {
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idFound = true;
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break;
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}
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}
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// Merging the properties
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Object.keys(properties).forEach(function (key) {
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if(idFound && properties[key].id) {
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// don't inherit id properties
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return;
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}
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if(subclassProperties[key] === undefined) {
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subclassProperties[key] = properties[key];
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}
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});
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// Merge the settings
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Object.keys(settings).forEach(function (key) {
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if(subclassSettings[key] === undefined) {
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subclassSettings[key] = settings[key];
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}
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});
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// Define the subclass
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var subClass = dataSource.define(className, subclassProperties, subclassSettings, ModelClass);
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// Calling the setup function
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if(typeof subClass.setup === 'function') {
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subClass.setup.call(subClass);
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}
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return subClass;
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};
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/**
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* Register a property for the model class
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* @param propertyName
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*/
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ModelClass.registerProperty = function (propertyName) {
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var properties = modelDefinition.build();
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var prop = properties[propertyName];
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var DataType = prop.type;
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if(!DataType) {
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throw new Error('Invalid type for property ' + propertyName);
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}
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if (Array.isArray(DataType) || DataType === Array) {
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DataType = List;
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} else if (DataType.name === 'Date') {
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var OrigDate = Date;
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DataType = function Date(arg) {
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return new OrigDate(arg);
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};
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} else if(typeof DataType === 'string') {
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DataType = dataSource.resolveType(DataType);
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}
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if(prop.required) {
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var requiredOptions = typeof prop.required === 'object' ? prop.required : undefined;
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ModelClass.validatesPresenceOf(propertyName, requiredOptions);
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}
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Object.defineProperty(ModelClass.prototype, propertyName, {
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get: function () {
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if (ModelClass.getter[propertyName]) {
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return ModelClass.getter[propertyName].call(this); // Try getter first
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} else {
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return this.__data && this.__data[propertyName]; // Try __data
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}
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},
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set: function (value) {
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if (ModelClass.setter[propertyName]) {
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ModelClass.setter[propertyName].call(this, value); // Try setter first
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} else {
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if (!this.__data) {
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this.__data = {};
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}
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if (value === null || value === undefined) {
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this.__data[propertyName] = value;
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} else {
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if(DataType === List) {
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this.__data[propertyName] = DataType(value, properties[propertyName].type, this.__data);
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} else {
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// Assume the type constructor handles Constructor() call
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// If not, we should call new DataType(value).valueOf();
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this.__data[propertyName] = DataType(value);
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}
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}
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}
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},
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configurable: true,
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enumerable: true
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});
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// <propertyName>$was --> __dataWas.<propertyName>
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Object.defineProperty(ModelClass.prototype, propertyName + '$was', {
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get: function () {
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return this.__dataWas && this.__dataWas[propertyName];
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},
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configurable: true,
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enumerable: false
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});
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// FIXME: [rfeng] Do we need to keep the raw data?
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// Use $ as the prefix to avoid conflicts with properties such as _id
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Object.defineProperty(ModelClass.prototype, '$' + propertyName, {
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get: function () {
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return this.__data && this.__data[propertyName];
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},
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set: function (value) {
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if (!this.__data) {
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this.__data = {};
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}
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this.__data[propertyName] = value;
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},
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configurable: true,
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enumerable: false
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});
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};
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ModelClass.forEachProperty(ModelClass.registerProperty);
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ModelClass.emit('defined', ModelClass);
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return ModelClass;
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};
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/**
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* Define single property named `propertyName` on `model`
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*
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* @param {String} model - name of model
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* @param {String} propertyName - name of property
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* @param {Object} propertyDefinition - property settings
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*/
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ModelBuilder.prototype.defineProperty = function (model, propertyName, propertyDefinition) {
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this.definitions[model].defineProperty(propertyName, propertyDefinition);
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this.models[model].registerProperty(propertyName);
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};
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/**
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* Extend existing model with bunch of properties
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*
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* @param {String} model - name of model
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* @param {Object} props - hash of properties
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*
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* Example:
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*
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* // Instead of doing this:
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*
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* // amend the content model with competition attributes
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* db.defineProperty('Content', 'competitionType', { type: String });
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* db.defineProperty('Content', 'expiryDate', { type: Date, index: true });
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* db.defineProperty('Content', 'isExpired', { type: Boolean, index: true });
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*
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* // dataSource.extend allows to
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* // extend the content model with competition attributes
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* db.extendModel('Content', {
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* competitionType: String,
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* expiryDate: { type: Date, index: true },
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* isExpired: { type: Boolean, index: true }
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* });
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*/
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ModelBuilder.prototype.extendModel = function (model, props) {
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var t = this;
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Object.keys(props).forEach(function (propName) {
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var definition = props[propName];
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t.defineProperty(model, propName, definition);
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});
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};
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ModelBuilder.prototype.copyModel = function copyModel(Master) {
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var dataSource = this;
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var className = Master.modelName;
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var md = Master.dataSource.definitions[className];
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var Slave = function SlaveModel() {
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Master.apply(this, [].slice.call(arguments));
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};
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util.inherits(Slave, Master);
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Slave.__proto__ = Master;
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hiddenProperty(Slave, 'dataSource', dataSource);
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hiddenProperty(Slave, 'modelName', className);
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hiddenProperty(Slave, 'relations', Master.relations);
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if (!(className in dataSource.models)) {
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// store class in model pool
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dataSource.models[className] = Slave;
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dataSource.definitions[className] = {
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properties: md.properties,
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settings: md.settings
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};
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}
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return Slave;
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};
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/*!
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* Define hidden property
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*/
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function hiddenProperty(where, property, value) {
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Object.defineProperty(where, property, {
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writable: true,
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enumerable: false,
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configurable: true,
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value: value
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});
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}
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/**
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* Get the schema name
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*/
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ModelBuilder.prototype.getSchemaName = function (name) {
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if (name) {
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return name;
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}
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if (typeof this._nameCount !== 'number') {
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this._nameCount = 0;
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} else {
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this._nameCount++;
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}
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return 'AnonymousModel_' + this._nameCount;
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};
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/**
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* Resolve the type string to be a function, for example, 'String' to String
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* @param {String} type The type string, such as 'number', 'Number', 'boolean', or 'String'. It's case insensitive
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* @returns {Function} if the type is resolved
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*/
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ModelBuilder.prototype.resolveType = function(type) {
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if (!type) {
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return type;
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}
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if (Array.isArray(type) && type.length > 0) {
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// For array types, the first item should be the type string
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var itemType = this.resolveType(type[0]);
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if (typeof itemType === 'function') {
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return [itemType];
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}
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else {
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return itemType; // Not resolved, return the type string
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}
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}
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if (typeof type === 'string') {
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var schemaType = ModelBuilder.schemaTypes[type.toLowerCase()] || this.models[type];
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if (schemaType) {
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return schemaType;
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} else {
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// The type cannot be resolved, let's create a place holder
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type = this.define(type, {}, {unresolved: true});
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return type;
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}
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} else if (type.constructor.name === 'Object') {
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// We also support the syntax {type: 'string', ...}
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if (type.type) {
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return this.resolveType(type.type);
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} else {
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return this.define(this.getSchemaName(null),
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type, {anonymous: true, idInjection: false});
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}
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} else if('function' === typeof type ) {
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return type;
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}
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return type;
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};
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/**
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* Build models from dataSource definitions
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*
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* `schemas` can be one of the following:
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*
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* 1. An array of named dataSource definition JSON objects
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* 2. A dataSource definition JSON object
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* 3. A list of property definitions (anonymous)
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*
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* @param {*} schemas The schemas
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* @returns {Object} A map of model constructors keyed by model name
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*/
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ModelBuilder.prototype.buildModels = function (schemas) {
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var models = {};
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// Normalize the schemas to be an array of the schema objects {name: <name>, properties: {}, options: {}}
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if (!Array.isArray(schemas)) {
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if (schemas.properties && schemas.name) {
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// Only one item
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schemas = [schemas];
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} else {
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// Anonymous dataSource
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schemas = [
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{
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name: this.getSchemaName(),
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properties: schemas,
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options: {anonymous: true}
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}
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];
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}
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}
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var associations = [];
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for (var s in schemas) {
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var name = this.getSchemaName(schemas[s].name);
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schemas[s].name = name;
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var model = this.define(schemas[s].name, schemas[s].properties, schemas[s].options);
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models[name] = model;
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associations = associations.concat(model.definition.associations);
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}
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// Connect the models based on the associations
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for (var i = 0; i < associations.length; i++) {
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var association = associations[i];
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var sourceModel = models[association.source];
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var targetModel = models[association.target];
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if (sourceModel && targetModel) {
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if(typeof sourceModel[association.relation] === 'function') {
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sourceModel[association.relation](targetModel, {as: association.as});
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}
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}
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}
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return models;
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};
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/**
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* Introspect the json document to build a corresponding model
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* @param {String} name The model name
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* @param {Object} json The json object
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* @param [Object} options The options
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* @returns {}
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*/
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ModelBuilder.prototype.buildModelFromInstance = function(name, json, options) {
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// Introspect the JSON document to generate a schema
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var schema = introspect(json);
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// Create a model for the generated schema
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return this.define(name, schema, options);
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};
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