/**
  * Model ID validation.
  *
  * @param string $attribute Attribute name
  * @param array $params Attribute params
  *
  * @return mixed
  */
 public function validateModelId($attribute, $params)
 {
     /** @var ActiveRecord $class */
     $class = Model::findIdentity($this->model_class);
     if ($class === null) {
         $this->addError($attribute, \Yii::t('net_frenzel_communication', 'ERROR_MSG_INVALID_MODEL_ID'));
     } else {
         $model = $class->name;
         if ($model::find()->where(['id' => $this->entity_id]) === false) {
             $this->addError($attribute, \Yii::t('net_frenzel_communication', 'ERROR_MSG_INVALID_MODEL_ID'));
         }
     }
 }