/**
* Implements adder mechanism.
*
* @param Opus_Model_Field $field The field to work on.
* @param mixed $arguments Arguments passed in the get-call.
*
* @return Opus_Model_Abstract The added model (can be a new model).
*/
protected function _addFieldValue(Opus_Model_Field $field, $value)
{
if (is_null($value)) {
$modelclass = $field->getValueModelClass();
if (is_null($modelclass)) {
throw new Opus_Model_Exception('Add accessor without parameter currently only available for fields holding models.');
}
$value = new $modelclass();
}
$field->addValue($value);
return $value;
}
