new.js

// cards/new.js
import Ember from 'ember';

export default Ember.ObjectController.extend({
  needs: ['board'],
  board: Ember.computed.alias('controllers.board'),
  actions: {
    createCard: function() {
      var board = this.get('board');
      board.get('cards').pushObject(this.get('model')).save().then(function() {
        this.transitionToRoute('board', board);
      }.bind(this));
    }
  }
});