Accessing meta information passed in a json server response

Question

I am using the Ember-Data Rest-Adapter and the JSON returned from my server looks basically like the one in the Active Model Serializers Documentation

{
  \"         


        

Answer 1

I found a cleaner approach for extracting meta information from the server response with ember-data.

We have to tell the serializer which meta-information to expect (in this case pagination):

 App.serializer = DS.RESTSerializer.create();

 App.serializer.configure({ pagination: 'pagination' });

 App.CustomAdapter = DS.RESTAdapter.extend({
   serializer: App.serializer
 });

 App.Store = DS.Store.extend({
   adapter: 'App.CustomAdapter'
 });

After that every time the server sends a meta-property with a pagination object this object will be added to the store's TypeMaps property for the requested Model-Class.

For example with the following response:

  {
    'meta': {'pagination': { 'page': 1, 'total': 10 } },
    'posts':[
      ...
    ]
  }

The TypeMap for the App.Post-Model would include the pagination object after the posts have loaded.

You can't observe the TypeMaps-property of the store directly so I added an computed property to the PostsController to have access to the requests pagination meta information:

 App.PostsController = Ember.ArrayController.extend({
    pagination: function () {
      if (this.get('model.isLoaded')) {
        modelType = this.get('model.type');
        this.get('store').typeMapFor(modelType).metadata.pagination
      }
    }.property('model.isLoaded')
 });

I really don't think that's a great solution to the meta information problem but this is the best solution I was able to come up with yet with Ember-Data. Maybe this will be easier in the future.