/**
* @inheritdoc
*/
public function rules()
{
$rules = parent::rules();
if ($this->checkExist) {
$relation = $this->model->getRelation($this->relation);
$rules[] = [$this->attr, 'exist', 'isEmpty' => [$this, "isEmpty"], 'targetClass' => $relation->modelClass, 'targetAttribute' => key($relation->link), 'except' => [ActiveRecord::SCENARIO_SEARCH]];
}
return $rules;
}
