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2013-09-24T18:45:45.783
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2013-10-11T13:14:35.350
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We didn't want to add another framework to achieve that so we abstracted it away in a base model class. Here's how you declare and use it (<a href="https://gist.github.com/gaearon/6689379#file-basemodel-js" rel="nofollow">available as a gist</a>): <pre><code>// Declaration window.app.viewer.Model.GallerySection = window.app.Model.BaseModel.extend({ nestedTypes: { background: window.app.viewer.Model.Image, images: window.app.viewer.Collection.MediaCollection } }); // Usage var gallery = new window.app.viewer.Model.GallerySection({ background: { url: 'http://example.com/example.jpg' }, images: [ { url: 'http://example.com/1.jpg' }, { url: 'http://example.com/2.jpg' }, { url: 'http://example.com/3.jpg' } ], title: 'Wow' }); // (fetch will work equally well) console.log(gallery.get('background')); // window.app.viewer.Model.Image console.log(gallery.get('images')); // window.app.viewer.Collection.MediaCollection console.log(gallery.get('title')); // plain string </code></pre> It works equally well with <code>set</code> and <code>toJSON</code>. And here's <code>BaseModel</code>: <pre><code>window.app.Model.BaseModel = Backbone.Model.extend({ constructor: function () { if (this.nestedTypes) { this.checkNestedTypes(); } Backbone.Model.apply(this, arguments); }, set: function (key, val, options) { var attrs; /* jshint -W116 */ /* jshint -W030 */ // Code below taken from Backbone 1.0 to allow different parameter styles if (key == null) return this; if (typeof key === 'object') { attrs = key; options = val; } else { (attrs = {})[key] = val; } options || (options = {}); // Code above taken from Backbone 1.0 to allow different parameter styles /* jshint +W116 */ /* jshint +W030 */ // What we're trying to do here is to instantiate Backbone models and collections // with types defined in this.nestedTypes, and use them instead of plain objects in attrs. if (this.nestedTypes) { attrs = this.mapAttributes(attrs, this.deserializeAttribute); } return Backbone.Model.prototype.set.call(this, attrs, options); }, toJSON: function () { var json = Backbone.Model.prototype.toJSON.apply(this, arguments); if (this.nestedTypes) { json = this.mapAttributes(json, this.serializeAttribute); } return json; }, mapAttributes: function (attrs, transform) { transform = _.bind(transform, this); var result = {}; _.each(attrs, function (val, key) { result[key] = transform(val, key); }, this); return result; }, serializeAttribute: function (val, key) { var NestedType = this.nestedTypes[key]; if (!NestedType) { return val; } if (_.isNull(val) || _.isUndefined(val)) { return val; } return val.toJSON(); }, deserializeAttribute: function (val, key) { var NestedType = this.nestedTypes[key]; if (!NestedType) { return val; } var isCollection = this.isTypeASubtypeOf(NestedType, Backbone.Collection), child; if (val instanceof Backbone.Model || val instanceof Backbone.Collection) { child = val; } else if (!isCollection && (_.isNull(val) || _.isUndefined(val))) { child = null; } else { child = new NestedType(val); } var prevChild = this.get(key); // Return existing model if it is equal to child's attributes if (!isCollection && child && prevChild && _.isEqual(prevChild.attributes, child.attributes)) { return prevChild; } return child; }, isTypeASubtypeOf: function (DerivedType, BaseType) { // Go up the tree, using Backbone's __super__. // This is not exactly encouraged by the docs, but I found no other way. if (_.isUndefined(DerivedType['__super__'])) { return false; } var ParentType = DerivedType['__super__'].constructor; if (ParentType === BaseType) { return true; } return this.isTypeASubtypeOf(ParentType, BaseType); }, checkNestedTypes: function () { _.each(this.nestedTypes, function (val, key) { if (!_.isFunction(val)) { console.log('Not a function:', val); throw new Error('Invalid nestedTypes declaration for key ' + key + ': expected a function'); } }); }, } </code></pre>
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