public function init() { parent::init(); if ($this->pageId) { if ($this->addFieldId) { $this->_field = PageFieldRecord::findOne(['page_id' => $this->pageId, 'additional_field_id' => $this->addFieldId]); } else { throw new InvalidParamException(Yii::t('front', 'No required parameter given') . ' - addFieldId'); } } else { throw new InvalidParamException(Yii::t('front', 'No required parameter given') . ' - pageId'); } }