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POHow to create a model and its associations in one request using Ember.js and Rails?
 

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  1. POHow to create a model and its associations in one request using Ember.js and Rails?
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    <p>In ember.js/ember-data.js, is there a way to have the store POST to rails such that it sends information to create a model and its associations? Let me provide some context.</p> <p>Suppose I have 3 rails models:</p> <pre><code>class Post &lt; ActiveRecord::Base has_many :categorizations has_many :categories, :through =&gt; :categorizations attr_accessible :categories_attributes accepts_nested_attributes_for :categories end class Categories &lt; ActiveRecord::Base has_many :categorizations has_many :posts, :through =&gt; :categorizations end class Categorizations &lt; ActiveRecord::Base belongs_to :post belongs_to :categories end </code></pre> <p>In ember.js, I want to be able to create a post along with its categorizations in one request. This is what I have done to achieve that:</p> <pre><code>App.Category = DS.Model.extend name: DS.attr 'string' App.Categorization = DS.Model.extend post: DS.belongsTo 'App.Post' category: DS.belongsTo 'App.Category' App.Post = DS.Model.extend title: DS.attr 'string' content: DS.attr 'string' categorizations: DS.hasMany 'App.Categorization', embedded: true toJSON: (options={}) -&gt; options.associations = true @_super(options) # meanwhile, somewhere else in code... post = App.store.createRecord App.Post, title: "some title" content: "blah blah" transaction = App.store.transaction() categorization = transaction.createRecord App.Categorization, category: category # an instance of DS.Category post.get('categorizations').pushObject categorization # XXX: This enables ember-data to include categorizations in the post hash when # POSTing to the server so that we can create a post and its categorizations in # one request. This hack is required because the categorization hasn't been # created yet so there is no id associated with it. App.store.clientIdToId[categorization.get('clientId')] = categorization.toJSON() transaction.remove(categorization) App.store.commit() </code></pre> <p>I'm trying to make it so that when App.store.commit() is called it POSTs to /posts with something like:</p> <pre><code>{ :post =&gt; { :title =&gt; "some title", :content =&gt; "blah blah, :categorizations =&gt; [ # or :categorizations_attributes would be nice { :category_id =&gt; 1 } ] } } </code></pre> <p>Is there a way to achieve this without having ember POST to categorizations_controller to create the categorizations?</p>
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    1. COI feel like this is extremely similar to what I've been [trying to accomplish](http://stackoverflow.com/questions/12439165/how-to-persist-hasmany-association-in-a-single-ember-js-form-using-ember-data) and still have not succeeded in doing.
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    2. CO@derrick kindly post back you solution, when you have resolved this.
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