| protected _relation ( string $classType, string $key, array $data, array $options = [] ) : object | ||
| $classType | string | The type of class to create, either `'entity'` or `'set'`. |
| $key | string | The key name to which the related object is assigned. |
| $data | array | The internal data of the related object. |
| $options | array | Any other options to pass when instantiating the related object. |
| return | object | Returns a new `Document` object instance. |
protected function _relation($classType, $key, $data, $options = array())
{
return parent::_relation($classType, $key, $data, array('exists' => false) + $options);
}