Ember data relationship and fixtures - ember.js

Question

With ember data relationship can be {async: true} or {async: false}. How to create a model FIXTURES that mimic the behavior of an synced relashionship as described in the documentation :
var attr = DS.attr,
hasMany = DS.hasMany,
belongsTo = DS.belongsTo;
App.Post = DS.Model.extend({
title: attr(),
comments: hasMany('comment'),
user: belongsTo('user')
});
App.Comment = DS.Model.extend({
body: attr()
});
Ember Data expects that a GET request to /posts/1 would return the JSON in the following format:
{
"post": {
"id": 1,
"title": "Rails is omakase",
"comments": ["1", "2"],
"user" : "dhh"
},
"comments": [{
"id": "1",
"body": "Rails is unagi"
}, {
"id": "2",
"body": "Omakase O_o"
}]
}

Answer 1

You'll want to override the find method of the adapter. Here is the current implementation of the find method in the FixtureAdapter. You can see that it simply finds the record with the given ID, then returns it. You're going to want to modify that so that it side-loads the proper records. Something like this:
var json = {};
json[type.typeKey] = requestedRecord;
type.eachRelationship(function(name, meta) {
if (!meta.async) {
json[meta.type.typeKey.pluralize()] = [ /* put related records here */ ];
}
});
The syntax may not be perfect, but you should get the idea.