/**
 * @return \yii\db\ActiveQuery
 */
public function getUser()
{
    return $this->hasOne(UserProfile::className(), ['user_id' => 'user_id']);
}

class InquiryRecordSearch extends InquiryRecord
{

public $mobile;
public $nickname;
/**
 * @inheritdoc
 */
public function rules()
{
    return [
        [['id', 'status', 'create_time', 'car_models_id', 'user_id'], 'integer'],
         [['order_id'], 'string'],
         [['mobile','nickname'],'safe'],
    ];
}

/**
 * @inheritdoc
 */
public function scenarios()
{
    // bypass scenarios() implementation in the parent class
    return Model::scenarios();
}

/**
 * Creates data provider instance with search query applied
 *
 * @param array $params
 *
 * @return ActiveDataProvider
 */
public function search($params)
{
    $query = InquiryRecord::find();

    // add conditions that should always apply here
    $query->joinWith(['user']);
    $dataProvider = new ActiveDataProvider([
        'query' => $query,
        'pagination' => [
            'defaultPageSize'=>Yii::$app->params['defaultPageSize']
        ],
        'sort'=>[
            'defaultOrder' => [
                'id' => SORT_DESC
            ]
        ],
    ]);

    $dataProvider->setSort([
        'attributes' => [
            /* 其它字段不要动 */    
            /*  下面这段是加入的 */
            /*=============*/
            'mobile' => [
                'asc' => ['mobile' => SORT_ASC],
                'desc' => ['mobile' => SORT_DESC],
                'label' => 'Mobile'
            ],
            'nickname' => [
                'asc' => ['nickname' => SORT_ASC],
                'desc' => ['nickname' => SORT_DESC],
                'label' => 'Nickname'
            ],
            /*=============*/
        ]
    ]);

    $this->load($params);
    if (!$this->validate()) {
        // uncomment the following line if you do not want to return any records when validation fails
        // $query->where('0=1');
        return $dataProvider;
    }
    // grid filtering conditions
    $query->andFilterWhere([
        'id' => $this->id,
        'order_id' => $this->order_id,
        'status' => $this->status,
        'create_time' => $this->create_time,
        'car_models_id' => $this->car_models_id,
        'user_id' => $this->user_id,
    ]);
    $query->andFilterWhere(['like', 'mobile', $this->mobile]);
    $query->andFilterWhere(['like', 'nickname', $this->nickname]);

    return $dataProvider;
}

}
GridView::widget([

    'dataProvider' => $dataProvider,
    'filterModel' => $searchModel,
    'columns' => [
        //['class' => 'yii\grid\SerialColumn'],
        //'id',
        'order_id',
        [
            'attribute' => 'nickanme',
            'label' => '申请人',
            'value' => 'user.nickname',
            'filter' => Html::activeTextInput($searchModel, 'nickname', [
                'class' => 'form-control'
            ]),
        ],
        [
            'attribute' => 'mobile',
            'label' => '联系电话',
            'value' => 'user.mobile',
            'filter' => Html::activeTextInput($searchModel, 'mobile', [
                'class' => 'form-control'
            ]),
        ],