How to eliminate the following unnecesary code with ember-data

state.js

// I need to identify if the app is in a callback environment or fixtures
// ending with the following code which seems not to be the correct way to do that

  insertCode: function(stateManager, code ) {

    var invitations = Yn.store.find(Yn.Invitation, {code: code});
    var self = this;
    invitations.addObserver('isLoaded', function() {
      self._callback(stateManager, invitations);
    });

    if ( !Yn.WORKING_WITH_SERVER ) {
      self._callback(stateManager, invitations);
    } 

  },

  _callback: function(stateManager, invitations) {

      var status = 0;
      if ( invitations.get('length') > 0 ) {

        App.invitationController.set('content', invitations);
        App.invitationController.set('selected', invitations.objectAt(0) );
        stateManager.goToState('invitation');

      } else { 
        status = 1;
      }

      App.readController.set('status', status);


  }

store_adapters.js

//// rest adapter  
 findAll: function(store, type) {
    var root = this.rootForType(type);

    this.ajax(root, "GET", {
      success: function(json) {
        store.loadMany(type, json["objects"]);
        store.typeMapFor(type).modelArrays.forEach( function(item) {
          item.set('isLoaded', true);
        });
        
      }
    });
  },

///// fixture adapter
  findAll: function(store, type) {
    var fixtures = type.FIXTURES;

    ember_assert("Unable to find fixtures for model type "+type.toString(), !!fixtures);

    var ids = fixtures.map(function(item, index, self){ return item.id; });
    store.loadMany(type, ids, fixtures);
    store.typeMapFor(type).modelArrays.forEach( function(item) {
       item.set('isLoaded', true);
    });

  }

thanks, much better. Anyway, seems than ember-data could provides something to not require the isLoaded patch.