Poor man's colletions in ember.js

products.js

App = Ember.Application.create({
  collections: Ember.Object.create({
    products: null
  })
});

App.set("collections.products", Ember.ArrayProxy.create({
  content: [],

  all: function(params){
    var collection = this;
    return apiGET("/products", params).then(function(products){
      return collection.set("content", products.map(function(product){
        return App.Product.create(product);
      }));
    });
  },

  findById: function(id){
    return apiGET("/products/" + id).then(function(product){
      return App.Product.create(product);
    });
  }
}));

App.ProductsRoute = Ember.Route.extend({
  model: function(){
    return App.get("collections.products").all()
  }
});

App.ProductRoute = Ember.Route.extend({
  model: function(params){
    return App.get("collections.products").findById(params.productId)
  }
});