ember data dependent createRecords

createRecords: function(store, type, records) {
    var adapter = this, serializer = this.serializer, initialRecordsToCreate = [];

    if (get(this, 'bulkCommit') === false) {

      records.forEach(function(record) {

        var deferSave = false

        record.eachRelationship(function(name, relationship) {
          var key = serializer._keyForBelongsTo(record.constructor, name),
              child, createDependentRecords;

          if (relationship.kind === 'belongsTo') {
            if (!serializer.embeddedType(type, name)) {
              child = get(record, relationship.key);

              createDependentRecords = function() {
                adapter.createRecords(store, type, [record]);
                child.removeObserver('id', createDependentRecords);
              };

              if(child && !get(child, 'id')) {
                child.addObserver('id', adapter,  createDependentRecords);
                deferSave = true;
              }
            }
          }
        }, this);

        if(!deferSave) {
          initialRecordsToCreate.push(record);
        }

      });
      return this._super(store, type, initialRecordsToCreate);
    }

    var root = this.rootForType(type),
        plural = this.pluralize(root);

    var data = {};
    data[plural] = [];
    records.forEach(function(record) {
      data[plural].push(this.serialize(record, { includeId: true }));
    }, this);

    return this.ajax(this.buildURL(root), "POST", {
      data: data
    }).then(function(json) {
      adapter.didCreateRecords(store, type, records, json);
    }).then(null, DS.rejectionHandler);
  },