public function search($params)
 {
     $query = FieldValueVariant::find();
     $dataProvider = new ActiveDataProvider(['query' => $query]);
     $this->load($params);
     if (!$this->validate()) {
         return $dataProvider;
     }
     $query->andFilterWhere(['id' => $this->id, 'field_id' => $this->field_id]);
     $query->andFilterWhere(['like', 'value', $this->value]);
     return $dataProvider;
 }