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POHow and when to fetch many-to-many relationships objects from server
 

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  1. POHow and when to fetch many-to-many relationships objects from server
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    <p>I'm having some issue with my Ember web application. I'm using Ember 1.0 stable as the base JS framework and Ember-data.js 1.0 beta 1 to handle the relationships between model and the CRUD operations.</p> <p>My simple application manages two entities: User and Order with a many to many relationship between them.</p> <p>Here are the models:</p> <pre><code> /*User Model*/ App.User = DS.Model.extend({ first_name: DS.attr('string'), last_name: DS.attr('string'), fullName: function() { return this.get('first_name') + ' ' + this.get('last_name'); }.property('first_name', 'last_name'), userorders: DS.hasMany('userorder', {async: true}) }); /*Order Model*/ App.Order = DS.Model.extend({ description: DS.attr('string'), userorders: DS.hasMany('userorder', {async: true}) }); </code></pre> <p>I created the model Userorder which maintains the one-to-one relationships with both User and Order.</p> <p>Here is the model for Userorder:</p> <pre><code> App.Userorder = DS.Model.extend({ order: DS.belongsTo("order", {async: true, key: "order_id"}), user: DS.belongsTo("user", {async: true, key: "user_id"}) }); </code></pre> <p>My problem comes up when i try to get (into UserorderRoute) the single instance of a usersorder. Follows the code for UserorderRoute:</p> <pre><code>App.UserorderRoute = Ember.Route.extend({ model: function(params) { return this.store.find("userorder", params.userorder_id); } }); </code></pre> <p>The userorder instance is correctly fetched, but if I try to access to the 'order' object I get undefined, (obviously, I get the same behavior with the access to 'user').</p>
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    1. USAndrea
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      1. USFrancesco Papagno
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    1. COUPDATE: we have extended the DS.RESTSerializer with "extractSingle" function and now we are able to get the JSON as Ember-data requires. The result of this modification is that the HTTP GET request for the related object is done, but the template still doesn't show any attribute. Our guess is that the related model are instantiated but without attributes. Anybody has the same issue?
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Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

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