696 lines
20 KiB
JavaScript
696 lines
20 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 assert = require('assert');
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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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var mergeSettings = require('./utils').mergeSettings;
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var MixinProvider = require('./mixins');
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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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* @property {Object} definitions Definitions of the models.
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* @property {Object} models Model constructors
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* @class
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*/
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function ModelBuilder() {
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// create blank models pool
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this.models = {};
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this.definitions = {};
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this.mixins = new MixinProvider(this);
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this.defaultModelBaseClass = DefaultModelBaseClass;
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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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function isModelClass(cls) {
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if (!cls) {
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return false;
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}
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return cls.prototype instanceof DefaultModelBaseClass;
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}
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/**
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* Get a model by name.
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*
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* @param {String} name The model name
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* @param {Boolean} forceCreate Whether the create a stub for the given name if a model doesn't exist.
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* @returns {*} The model class
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*/
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ModelBuilder.prototype.getModel = function (name, forceCreate) {
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var model = this.models[name];
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if (!model && forceCreate) {
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model = this.define(name, {}, {unresolved: true});
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}
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return model;
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};
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/**
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* Get the model definition by name
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* @param {String} name The model name
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* @returns {ModelDefinition} The model definition
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*/
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ModelBuilder.prototype.getModelDefinition = function (name) {
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return this.definitions[name];
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};
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/**
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* Define a model class.
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* Simple example:
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* ```
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* var User = modelBuilder.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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* More advanced example:
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* ```
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* var User = modelBuilder.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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* @param {String} className Name of class
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* @param {Object} properties Hash of class properties in format `{property: Type, property2: Type2, ...}` or `{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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*/
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ModelBuilder.prototype.define = function defineClass(className, properties, settings, parent) {
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var modelBuilder = this;
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var args = slice.call(arguments);
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var pluralName = (settings && settings.plural) ||
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inflection.pluralize(className);
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var httpOptions = (settings && settings.http) || {};
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var pathName = httpOptions.path || pluralName;
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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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// Set up the base model class
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var ModelBaseClass = parent || this.defaultModelBaseClass;
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var baseClass = settings.base || settings['super'];
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if (baseClass) {
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if (isModelClass(baseClass)) {
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ModelBaseClass = baseClass;
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} else {
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ModelBaseClass = this.models[baseClass];
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assert(ModelBaseClass, 'Base model is not found: ' + baseClass);
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}
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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, options) {
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if (!(this instanceof ModelConstructor)) {
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return new ModelConstructor(data, options);
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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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};
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// mix in EventEmitter (don't inherit from)
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var events = new EventEmitter();
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// The model can have more than 10 listeners for lazy relationship setup
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// See https://github.com/strongloop/loopback/issues/404
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events.setMaxListeners(32);
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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] = EventEmitter.prototype[f].bind(events);
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}
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}
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hiddenProperty(ModelClass, 'modelName', className);
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}
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util.inherits(ModelClass, ModelBaseClass);
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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, 'modelBuilder', modelBuilder);
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hiddenProperty(ModelClass, 'dataSource', null); // Keep for back-compatibility
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hiddenProperty(ModelClass, 'pluralModelName', pluralName);
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hiddenProperty(ModelClass, 'relations', {});
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hiddenProperty(ModelClass, 'http', { path: '/' + pathName });
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hiddenProperty(ModelClass, 'base', ModelBaseClass);
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// inherit ModelBaseClass static methods
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for (var i in ModelBaseClass) {
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// We need to skip properties that are already in the subclass, for example, the event emitter methods
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if (i !== '_mixins' && !(i in ModelClass)) {
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ModelClass[i] = ModelBaseClass[i];
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}
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}
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// Load and inject the model classes
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if (settings.models) {
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Object.keys(settings.models).forEach(function (m) {
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var model = settings.models[m];
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ModelClass[m] = typeof model === 'string' ? modelBuilder.getModel(model, true) : model;
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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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var props = ModelClass.definition.properties;
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var keys = Object.keys(props);
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for (var i = 0, n = keys.length; i < n; i++) {
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cb(keys[i], props[keys[i]]);
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}
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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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/** Extend the model with the specified model, properties, and other settings.
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* For example, to extend an existing model, for example, a built-in model:
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*
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* ```js
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* var Customer = User.extend('customer', {
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* accountId: String,
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* vip: Boolean
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* });
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* ```
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*
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* To extend the base model, essentially creating a new model:
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* ```js
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* var user = loopback.Model.extend('user', properties, options);
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* ```
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*
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* @param {String} className Name of the new model being defined.
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* @options {Object} properties Properties to define for the model, added to properties of model being extended.
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* @options {Object} settings Model settings, such as relations and acls.
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*
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*/
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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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var keys = Object.keys(properties);
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for (var i = 0, n = keys.length; i < n; i++) {
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var key = keys[i];
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if (idFound && properties[key].id) {
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// don't inherit id properties
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continue;
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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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subclassSettings = mergeSettings(settings, subclassSettings);
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// Define the subclass
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var subClass = modelBuilder.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 {String} propertyName Name of the property.
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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 (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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var DataType = ModelClass.definition.properties[propertyName].type;
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if (Array.isArray(DataType) || DataType === Array) {
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DataType = List;
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} else if (DataType === Date) {
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DataType = DateType;
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} else if (typeof DataType === 'string') {
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DataType = modelBuilder.resolveType(DataType);
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}
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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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this.__data = this.__data || {};
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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] = (value instanceof DataType) ? value : 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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// 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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var props = ModelClass.definition.properties;
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var keys = Object.keys(props);
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var size = keys.length;
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for (i = 0; i < size; i++) {
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var propertyName = keys[i];
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ModelClass.registerProperty(propertyName);
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}
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var mixinSettings = settings.mixins || {};
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keys = Object.keys(mixinSettings);
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size = keys.length;
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for (i = 0; i < size; i++) {
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var name = keys[i];
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var mixin = mixinSettings[name];
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if (mixin === true) {
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mixin = {};
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}
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if (Array.isArray(mixin)) {
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mixin.forEach(function(m) {
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if (m === true) m = {};
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if (typeof m === 'object') {
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modelBuilder.mixins.applyMixin(ModelClass, name, m);
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}
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});
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} else if (typeof mixin === 'object') {
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modelBuilder.mixins.applyMixin(ModelClass, name, mixin);
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}
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}
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ModelClass.emit('defined', ModelClass);
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return ModelClass;
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};
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// DataType for Date
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function DateType(arg) {
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return new Date(arg);
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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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* Define a new value type that can be used in model schemas as a property type.
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* @param {function()} type Type constructor.
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* @param {string[]=} aliases Optional list of alternative names for this type.
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*/
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ModelBuilder.prototype.defineValueType = function(type, aliases) {
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ModelBuilder.registerType(type, aliases);
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};
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/**
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* Extend existing model with specified properties
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*
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* Example:
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* Instead of extending a model with attributes like this (for example):
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*
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* ```js
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* db.defineProperty('Content', 'competitionType',
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* { type: String });
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* db.defineProperty('Content', 'expiryDate',
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* { type: Date, index: true });
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* db.defineProperty('Content', 'isExpired',
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* { type: Boolean, index: true });
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*```
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* This method enables you to extend a model as follows (for example):
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* ```js
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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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*
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* @param {String} model Name of model
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* @options {Object} properties JSON object specifying properties. Each property is a key whos value is
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* either the [type](http://docs.strongloop.com/display/LB/LoopBack+types) or `propertyName: {options}`
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* where the options are described below.
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* @property {String} type Datatype of property: Must be an [LDL type](http://docs.strongloop.com/display/LB/LoopBack+types).
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* @property {Boolean} index True if the property is an index; false otherwise.
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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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var keys = Object.keys(props);
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for (var i = 0; i < keys.length; i++) {
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var definition = props[keys[i]];
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t.defineProperty(model, keys[i], definition);
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}
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};
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ModelBuilder.prototype.copyModel = function copyModel(Master) {
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var modelBuilder = this;
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var className = Master.modelName;
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var md = Master.modelBuilder.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, 'modelBuilder', modelBuilder);
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hiddenProperty(Slave, 'modelName', className);
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hiddenProperty(Slave, 'relations', Master.relations);
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if (!(className in modelBuilder.models)) {
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// store class in model pool
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modelBuilder.models[className] = Slave;
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modelBuilder.definitions[className] = {
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properties: md.properties,
|
|
settings: md.settings
|
|
};
|
|
}
|
|
|
|
return Slave;
|
|
};
|
|
|
|
/*!
|
|
* Define hidden property
|
|
*/
|
|
function hiddenProperty(where, property, value) {
|
|
Object.defineProperty(where, property, {
|
|
writable: true,
|
|
enumerable: false,
|
|
configurable: true,
|
|
value: value
|
|
});
|
|
}
|
|
|
|
/**
|
|
* Get the schema name
|
|
*/
|
|
ModelBuilder.prototype.getSchemaName = function (name) {
|
|
if (name) {
|
|
return name;
|
|
}
|
|
if (typeof this._nameCount !== 'number') {
|
|
this._nameCount = 0;
|
|
} else {
|
|
this._nameCount++;
|
|
}
|
|
return 'AnonymousModel_' + this._nameCount;
|
|
};
|
|
|
|
/**
|
|
* Resolve the type string to be a function, for example, 'String' to String.
|
|
* Returns {Function} if the type is resolved
|
|
* @param {String} type The type string, such as 'number', 'Number', 'boolean', or 'String'. It's case insensitive
|
|
*/
|
|
ModelBuilder.prototype.resolveType = function (type) {
|
|
if (!type) {
|
|
return type;
|
|
}
|
|
if (Array.isArray(type) && type.length > 0) {
|
|
// For array types, the first item should be the type string
|
|
var itemType = this.resolveType(type[0]);
|
|
if (typeof itemType === 'function') {
|
|
return [itemType];
|
|
}
|
|
else {
|
|
return itemType; // Not resolved, return the type string
|
|
}
|
|
}
|
|
if (typeof type === 'string') {
|
|
var schemaType = ModelBuilder.schemaTypes[type.toLowerCase()] || this.models[type];
|
|
if (schemaType) {
|
|
return schemaType;
|
|
} else {
|
|
// The type cannot be resolved, let's create a place holder
|
|
type = this.define(type, {}, {unresolved: true});
|
|
return type;
|
|
}
|
|
} else if (type.constructor.name === 'Object') {
|
|
// We also support the syntax {type: 'string', ...}
|
|
if (type.type) {
|
|
return this.resolveType(type.type);
|
|
} else {
|
|
return this.define(this.getSchemaName(null),
|
|
type, {anonymous: true, idInjection: false});
|
|
}
|
|
} else if ('function' === typeof type) {
|
|
return type;
|
|
}
|
|
return type;
|
|
};
|
|
|
|
/**
|
|
* Build models from schema definitions
|
|
*
|
|
* `schemas` can be one of the following:
|
|
*
|
|
* 1. An array of named schema definition JSON objects
|
|
* 2. A schema definition JSON object
|
|
* 3. A list of property definitions (anonymous)
|
|
*
|
|
* @param {*} schemas The schemas
|
|
* @returns {Object} A map of model constructors keyed by model name
|
|
*/
|
|
ModelBuilder.prototype.buildModels = function (schemas) {
|
|
var models = {};
|
|
|
|
// Normalize the schemas to be an array of the schema objects {name: <name>, properties: {}, options: {}}
|
|
if (!Array.isArray(schemas)) {
|
|
if (schemas.properties && schemas.name) {
|
|
// Only one item
|
|
schemas = [schemas];
|
|
} else {
|
|
// Anonymous schema
|
|
schemas = [
|
|
{
|
|
name: this.getSchemaName(),
|
|
properties: schemas,
|
|
options: {anonymous: true}
|
|
}
|
|
];
|
|
}
|
|
}
|
|
|
|
var relations = [];
|
|
for (var s in schemas) {
|
|
var name = this.getSchemaName(schemas[s].name);
|
|
schemas[s].name = name;
|
|
var model = this.define(schemas[s].name, schemas[s].properties, schemas[s].options);
|
|
models[name] = model;
|
|
relations = relations.concat(model.definition.relations);
|
|
}
|
|
|
|
// Connect the models based on the relations
|
|
for (var i = 0; i < relations.length; i++) {
|
|
var relation = relations[i];
|
|
var sourceModel = models[relation.source];
|
|
var targetModel = models[relation.target];
|
|
if (sourceModel && targetModel) {
|
|
if (typeof sourceModel[relation.type] === 'function') {
|
|
sourceModel[relation.type](targetModel, {as: relation.as});
|
|
}
|
|
}
|
|
}
|
|
return models;
|
|
};
|
|
|
|
/**
|
|
* Introspect the JSON document to build a corresponding model.
|
|
* @param {String} name The model name
|
|
* @param {Object} json The JSON object
|
|
* @param {Object} options The options
|
|
* @returns {}
|
|
*/
|
|
ModelBuilder.prototype.buildModelFromInstance = function (name, json, options) {
|
|
|
|
// Introspect the JSON document to generate a schema
|
|
var schema = introspect(json);
|
|
|
|
// Create a model for the generated schema
|
|
return this.define(name, schema, options);
|
|
};
|
|
|
|
|
|
|