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Can you pre-load related data such that your relationships are cached in ember-data?

Asked By: Anonymous

I have a simple hasMany/belongsTo relationship that looks like this

App.Foo = DS.Model.extend({
  bar: belongsTo('bar', { async: true})
App.Bar = DS.Model.extend({
  foos: hasMany('foo', { async: true})

I have situations in my route code that fire off a request and when the response comes back I access the related “bar” model as I filter down / etc'foo').clear();
var fooz ='foo'); //new code
return'foo').then(function(response) {
  var filtered = response.filter(function(foo) {
    return foo.get('bar').get('name') === 'bazz';
  //other code that would normally be executed top-down
  //including side-effect stuff like this
  //'foo', someHash);
  return fooz; //new code

The above doesn’t work the first time around as foo.get(‘bar’) is a promise. But this is only a problem the first time through (subsequent $.ajax requests seems to have all the bar objects cached so it’s a non issue)

What’s strange is that before I even boot the app I’ve already pulled down all the bar data in the init (shown below). So why does ember-data even need to resolve the promise for “bar” when technically that data should already be in the store locally?

  name: 'bootstrap',
  initialize: function() {
    var store = App.__container__.lookup("store:main");
    var bars = store.find('bar');
    var configurations = store.find('configuration');
    Ember.RSVP.all([bars, configurations]).then(results) {


Answered By: Anonymous

Let’s separate a few things here

Store cache'foo').clear();

just breaks the internal all filter until a foo record is modified/added/removed forcing the filter to recalculate for the record in the store. I say this to show that clear isn’t removing the records from ED’s store.

Example (click the button, watch the console, read the fun action code)

That being said it isn’t the ajax that’s being cached, it’s the property/relationship on the record instance that’s being cached (and the record).

The proper way to remove the records of a type from the store is store.unloadAll('foo')


I know you’re already familiar with promises, so this part may be worthless, but, worth documenting

The async relationships are really cool because they return PromiseObject/PromiseArray for belongsTo/hasMany. The PromiseObject/PromiseArray extend ObjectProxy/ArrayProxy (these are the same things that ObjectController/ArrayController extend). This essentially gives the PromiseObject/PromiseArray the ability to proxy getting/setting of properties to the model underneath. In this case the setting/getting happens on the promise doesn’t “work” until the promise has been resolved (it won’t crash, just return undefined). *Caveat, methods don’t exist on the promise, so you can’t call save on the promise and expect it to work.

Ex. using your models.

var foo ='foo', 1);

var bar = foo.get('bar');  // PromiseObject

bar.get('name'); // undefined

later, bar has resolved, bar is still the PromiseObject

bar.get('name'); // billy

foo will keep returning the PromiseObject

var bar2 = foo.get('bar');  // PromiseObject

bar2.get('name'); // billy

saving; // Boom no workey

bar.then(function(realBar){; // workey

In your case I have 3 recommendations

Build your own promise, resolve when you want, use Ember.RSVP.all on the records needed (respecting that they may or may not be resolved yet, hence async)

var self = this;

var promise = new Ember.RSVP.Promise(function(resolve, reject){'foo').then(function(foos) {

      var filtered = bars.filterBy('name', 'bazz');

return promise;

async properties

A lot of times with async objects/properties that aren’t resolved during the model hook (which blocks on promises and wait’s until they are resolved) a good trick is to set a placeholder object etc.

var items = [];

controller.set('model', items);

// promise from above
  items.pushObjects(records.toArray()); // toArray may or may not apply

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