Error

Assertion failed: an Ember.CollectionView's content must implement Ember.Array. You passed function () {
                    var sbList = Ember.Array();
                    this.channels.forEach(function(c) {
                        sbList.pushObject(ChannelsModel.find(c.id));
                    });
                    return sbList;
                } application.js:727
Uncaught TypeError: Object function () {
                    var sbList = Ember.Array();
                    this.channels.forEach(function(c) {
                        sbList.pushObject(ChannelsModel.find(c.id));
                    });
                    return sbList;
                } has no method 'addArrayObserver' 

gistfile1.js

var utils = require('../utils.js');
var ChannelsModel = require('../models/channels.js');
var ChannelModel = require("../models/channel.js");

var ChannelsRoute = Ember.Route.extend({
    model: function() {
        return ChannelsModel.findAll().then(function(result) {
            return Ember.Object.create({
                channels:  result,
                subChannels:  function() {
                    var sbList = Ember.Array();
                    this.channels.forEach(function(c) {
                        sbList.pushObject(ChannelsModel.find(c.id));
                    });
                    return sbList;
                }
            })
        });
    },
    setupController: function(controller, model) {
        controller.set('channels', model.get('channels'));
        controller.set('subChannels', model.get('subChannels'));
    }
});

module.exports = ChannelsRoute;

gistfile2.js

var utils = require('../utils.js');

var ChannelModel = Ember.Object.extend({});
ChannelModel.reopenClass({
    find: function(channelId) {
        utils.get('channel/' + channelId, function(response) {
            return ChannelModel.create(response);
        });
    }
});

module.exports = ChannelModel;

gistfile3.js

var utils = require('../utils.js');

var ChannelsModel = Ember.Object.extend({});
ChannelsModel.reopenClass({
    findAll: function() {
        var channels = Ember.A();
        //var channels = [];
        var promise = Ember.Deferred.create();
        utils.get('channels', function(response) {
            response.channels.forEach(function(c, index) {
                channels.pushObject(ChannelsModel.create(c));
                if(index === channels.length -1) {
                    promise.resolve(channels);
                }
            })
        });
        return promise;
    }
});

module.exports = ChannelsModel;