public function search($params)
 {
     $query = ServiceType::find();
     $dataProvider = new ActiveDataProvider(['query' => $query]);
     if (!($this->load($params) && $this->validate())) {
         return $dataProvider;
     }
     $query->andFilterWhere(['id' => $this->id]);
     $query->andFilterWhere(['like', 'title', $this->title])->andFilterWhere(['like', 'keywords', $this->keywords])->andFilterWhere(['like', 'intro', $this->intro])->andFilterWhere(['like', 'body', $this->body]);
     return $dataProvider;
 }