code: function(local_record, referenced_record) {
  
  		var referenced_guid = referenced_record.guid;
  
  		if (referenced_guid in this._collections_by_foreign_guid) {
  
  			if (Lava.schema.DEBUG && this._collections_by_foreign_guid[referenced_guid].indexOf(local_record) != -1)
  				Lava.t("Duplicate record");
  			this._collections_by_foreign_guid[referenced_guid].push(local_record);
  
  		} else {
  
  			this._collections_by_foreign_guid[referenced_guid] = [local_record];
  
  		}
  
  		this._fire('added_child', {
  			collection_owner: referenced_record,
  			child: local_record
  		});
  
  	}
docs: Add `local_record` to field's internal collection of records from local module, referenced by `referenced_record`
  @param {Lava.data.Record} local_record
  @param {Lava.data.Record} referenced_record The collection owner