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

{   "meta": { "total": 10 },   "posts": [     { "title": "Post 1", "body": "Hello!" },     { "title": "Post 2", "body": "Goodbye!" }   ] } 

Fetching the data from the server works but unfortunately I am not able to figure out where I can access the meta information from my JSON response.

Based on my research in ember-data's github issue, support for meta information seems to be implemented with commit 1787bff.

But even with the test cases I was not able to figure out how to access the meta information.

App.PostController = Ember.ArrayController.extend({    ....    requestSearchData: function(searchParams){       posts = App.Post.find(searchParams);       this.set('content', posts);       // don't know how to access meta["total"]       // but I want to do something like this:       // this.set('totalCount', meta["total"])    } }) 

Can anybody of you shed some light on this for me, please? I am aware that the Ember api is moving fast but I am sure I am just missing a small part and that this is actually possible.

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.