code: public function init()
      {
          parent::init();
          $this->user = Instance::ensure($this->user, User::className());
          foreach ($this->rules as $i => $rule) {
              if (is_array($rule)) {
                  $this->rules[$i] = Yii::createObject(array_merge($this->ruleConfig, $rule));
              }
          }
      }
docs: Initializes the [[rules]] array by instantiating rule objects from configurations.