public function search($params)
 {
     $query = FilmCategory::find();
     $dataProvider = new ActiveDataProvider(['query' => $query]);
     if (!($this->load($params) && $this->validate())) {
         return $dataProvider;
     }
     $query->andFilterWhere(['film_id' => $this->film_id, 'category_id' => $this->category_id, 'last_update' => $this->last_update]);
     return $dataProvider;
 }
 /**
  * Finds the FilmCategory model based on its primary key value.
  * If the model is not found, a 404 HTTP exception will be thrown.
  * @param integer $film_id
  * @param integer $category_id
  * @return FilmCategory the loaded model
  * @throws HttpException if the model cannot be found
  */
 protected function findModel($film_id, $category_id)
 {
     if (($model = FilmCategory::findOne(['film_id' => $film_id, 'category_id' => $category_id])) !== null) {
         return $model;
     } else {
         throw new HttpException(404, 'The requested page does not exist.');
     }
 }