/**
* Validation rules
* @return array
*/
public function rules()
{
$rules = $this->_model->rules();
$rules[] = ['tags', 'exist', 'targetClass' => Tag::className(), 'targetAttribute' => 'id', 'allowArray' => true];
$rules['keyExists'] = ['key', 'unique', 'targetClass' => Post::className(), 'targetAttribute' => 'key', 'when' => function ($model) {
return $model->key != $model->item->key;
}];
return $rules;
}
public function getPost()
{
return $this->hasOne(Post::className(), ['id' => 'post_id']);
}