RESTAdapter.js

  didCreateRecord: function(record, data) {
    var rootKey = get(record.constructor, 'rootKey'),
        primaryKey = get(record.constructor, 'primaryKey'),
        dataToLoad = rootKey ? data[rootKey] : data;
    record.set(primaryKey, dataToLoad[primaryKey]); // setting the id returned by the server
    record.load(dataToLoad[primaryKey], dataToLoad);
    record.didCreateRecord();
  },