public function search($params)
 {
     $query = SpecialistHasType::find();
     $dataProvider = new ActiveDataProvider(['query' => $query]);
     if (!($this->load($params) && $this->validate())) {
         return $dataProvider;
     }
     $query->andFilterWhere(['spec_id' => $this->spec_id, 'spec_type_id' => $this->spec_type_id]);
     return $dataProvider;
 }