/**
  * Creates data provider instance with search query applied
  *
  * @param array $params
  *
  * @return ActiveDataProvider
  */
 public function search($params)
 {
     $query = AuthAssignment::find()->leftJoin('user', 'user.id = user_id');
     $dataProvider = new ActiveDataProvider(['query' => $query]);
     $this->load($params);
     if (!$this->validate()) {
         // uncomment the following line if you do not want to any records when validation fails
         // $query->where('0=1');
         return $dataProvider;
     }
     $query->andFilterWhere(['created_at' => $this->created_at]);
     $query->andFilterWhere(['=', 'item_name', $this->item_name])->andFilterWhere(['like', 'user_id', $this->user_id]);
     if ($this->email) {
         $query->andFilterWhere(['like', 'user.email', $this->email]);
     }
     return $dataProvider;
 }
 /**
  * Finds the AuthAssignment model based on its primary key value.
  * If the model is not found, a 404 HTTP exception will be thrown.
  * @param string $item_name
  * @param string $user_id
  * @return AuthAssignment the loaded model
  * @throws NotFoundHttpException if the model cannot be found
  */
 protected function findModel($item_name, $user_id)
 {
     if (($model = AuthAssignment::findOne(['item_name' => $item_name, 'user_id' => $user_id])) !== null) {
         return $model;
     } else {
         throw new NotFoundHttpException('The requested page does not exist.');
     }
 }