Sideload a lists "belongsTo" objects with EmberData - ember.js

Question

I have 3 emberData models:
App.Product = DS.Model.extend({
page_title: DS.attr('string'),
shop: DS.belongsTo('App.Shop'),
user: DS.belongsTo('App.User')
});
App.Shop = DS.Model.extend({
name: DS.attr('string'),
});
App.User = DS.Model.extend({
name: DS.attr('string')
});
and the JSON data looks like this:
{
products: [
{
id: "1",
page_title: "Product 1",
user_id: "1",
shop_id: "1",
},
{
id: "2",
page_title: "Product 2",
user_id: "2",
shop_id: "1",
}
],
users: [
{
id: "1",
name: "User 1"
},
{
id: "2",
name: "User 2"
}
],
shops: [
{
id: "1",
name: "Shop 1"
}
]
}
But when I load the data I got the following error:
Assertion failed: Your server returned a hash with the key shops but you have no mapping for it

Answer 1

Ok, the documentaion is very unclear about the fact that when you have a belongsTo relationship the key for the sideload must be singular not plural even if its a list. So the JSON has to look like this:
{
products: [
{
id: "1",
page_title: "Product 1",
user_id: "1",
shop_id: "1",
},
{
id: "2",
page_title: "Product 2",
user_id: "2",
shop_id: "1",
}
],
user: [
{
id: "1",
name: "User 1"
},
{
id: "2",
name: "User 2"
}
],
shop: [
{
id: "1",
name: "Shop 1"
}
]
}