Ember data serializer that normalizes embedded records without ids

adapter.js

App.ApplicationSerializer = DS.RESTSerializer.extend({
  // Extract embedded relations from the payload and load them into the store
  normalizeRelationships: function(type, hash) {
    var store = this.store;

    this._super(type, hash);

    type.eachRelationship(function(attr, relationship) {
      var relatedTypeKey = relationship.type.typeKey;

      if (relationship.options.embedded) {
        if (relationship.kind === 'hasMany') {
          hash[attr] = hash[attr].map(function(embeddedHash) {
            // Normalize the record with the correct serializer for the type
            var normalized = store.serializerFor(relatedTypeKey).normalize(relationship.type, embeddedHash, attr);

            // If the record has no id, give it a GUID so relationship management works
            if (!normalized.id) {
              normalized.id = Ember.generateGuid(null, relatedTypeKey);
            }

            // Push the record into the store
            store.push(relatedTypeKey, normalized);

            // Return just the id, and the relation manager will take care of the rest
            return normalized.id;
          });
        }
      }
    });
  }
});