ember-data mappings for sideloading revision 11 - ember-data

Question

What has happened to mappings to the revision 11 ember-data with regard to sideloading?
I have the following 2 model classes:
WZ.Exercise = WZ.Model.extend
name: DS.attr 'string'
description: DS.attr 'string'
group: DS.belongsTo('WZ.Group', {key: 'groups'}) #I don't think the key does anything
WZ.Group = WZ.Model.extend
name: DS.attr 'string'
exercises: DS.hasMany('WZ.Exercise')
Previously I had a mappings property on the adapter which no longer seems to do anything:
WZ.Store = DS.Store.extend
revision: 11
adapter: DS.RESTAdapter.create
bulkCommit: false
mappings:
groups: WZ.Group
The sideloading code expects the sideloaded root json property to be the same as the property name:
for (var prop in json) {
if (!json.hasOwnProperty(prop)) { continue; }
if (prop === root) { continue; }
if (prop === this.configOption(type, 'meta')) { continue; }
sideloadedType = type.typeForRelationship(prop);
I don't see anyway to get round this. Either the json is in the state the code expects or it will not work.

Answer 1

This is how I sideload data:
DS.RESTAdapter.configure('App.Groups', {
sideloadAs: 'groups'
});
App.Store = DS.Store.extend({
revision: 11,
adapter: DS.RESTAdapter.create({})
});

Answer 2

I encountered a similar problem and found a mapping in the ember_data_example project that resolved it for me. In my case, a ticketEntries: hasMany('App.TicketEntry') was not loading.
// Prepare our global Ember Data 'store'
App.RESTSerializer = DS.RESTSerializer.extend({
init: function() {
this._super();
this.map('App.Ticket', {
creator: {embedded: 'always'},
ticketEntries: {embedded: 'always'}
});
}
});
App.Adapter = DS.RESTAdapter.extend({
bulkCommit: false,
serializer: App.RESTSerializer.create()
});
App.Store = DS.Store.extend({
revision: 11,
adapter: App.Adapter.create()
});
App.store = App.Store.create(
);