code: function (factory, id, context) {
                  context = context || this.getContextByProperties();
                  return context.createEntity(factory, id);
              }
docs: *
  Create an instance of {js.data.Entity}
  @param {Function} factory
  @param {String|Number} [id]
  @param {js.data.DataSource.Context} [context]
  @return {js.data.Entity|js.data.Model}