Yii2实现让关联字段支持搜索功能的方法

<?= GridView::widget([  'dataProvider' => $dataProvider,  'filterModel' => $searchModel,  'columns' => [    ['class' => 'yii/grid/SerialColumn'],    //添加的代码开始    [      'label'=>'公司名',      'attribute'=>'companies_company_id',      'value'=>'companiesCompany.company_name'    ],     //添加的代码结束    'companiesCompany.company_name',    // 'branch_id',    // 'companies_company_id',    'branch_name',    'branch_address',    'branch_created_date',    // 'branch_status',    ['class' => 'yii/grid/ActionColumn'],  ],]); ?>

public function rules(){  return [    [['branch_id'], 'integer'],    [['branch_name', 'branch_address', 'branch_created_date', 'branch_status','companies_company_id'], 'safe'],  ];}

public function search($params){  $query = Branches::find();  $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;  }  // 添加下面这行代码  $query->joinWith('companiesCompany');  $query->andFilterWhere([    'branch_id' => $this->branch_id,  //  'companies_company_id' => $this->companies_company_id,    'branch_created_date' => $this->branch_created_date,  ]);  $query->andFilterWhere(['like', 'branch_name', $this->branch_name])    ->andFilterWhere(['like', 'branch_address', $this->branch_address])    ->andFilterWhere(['like', 'branch_status', $this->branch_status])     // 添加下面这行代码    ->andFilterWhere(['like', 'companies.company_name', $this->companies_company_id]);  return $dataProvider;