Q: yii2 dataProvider doesn't display join attributes - php

Question

I have a relation between User and Thesis and my dataProvider just displays user attributes and not thesis'ones in the Gridview. Is there a better way to print join attributes than: ['attribute'] => ['table.attribute']?
model:
public function search($params)
{
$query = Request::find()->joinWith('user')->joinWith('thesis')->where(['thesis.staff'=> Yii::$app->user->identity->id]);
$dataProvider = new ActiveDataProvider([
'query' => $query,
]);
$this->load($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;
}
view:
<?= GridView::widget([
'dataProvider' => $dataProvider,
'filterModel' => $searchModel,
'columns' => [
['class' => 'yii\grid\SerialColumn'],
//'id',
'title',
['attribute' => 'thesis',
'value' => 'thesis.title'],
//'company',
'description:ntext',
'duration',
['attribute' => 'user'
'value' => 'user.id'],
//'requirements',
//'course',
'n_person',
'ref_person',
'is_visible:boolean',
//'created_at',
//'staff',
['class' => 'yii\grid\ActionColumn'],
],
]); ?>
controller:
public function actionIndex()
{
$searchModel = new SearchRequest();
$dataProvider = $searchModel->search(Yii::$app->request->queryParams);
return $this->render('index', [
'searchModel' => $searchModel,
'dataProvider' => $dataProvider,
]);
}

Answer 1

You need to add the relation getters on your model.
On your Thesis model, you need to add something like
public function getUser0 () {
return $this->hasOne(\your\user\model\location\User::className(), ['id' => 'user']);
}
Having this on your model will populate via lazy-load the user relation when you call Thesis::user0, in your case, something like this:
<?= GridView::widget([
'dataProvider' => $dataProvider,
'filterModel' => $searchModel,
'columns' => [
['class' => 'yii\grid\SerialColumn'],
/// ---- other attributes
['attribute' => 'user0.name'],
/// ---- other attributes
],
]); ?>

Answer 2

Is better to add your code after $this->load($params);
My example is:
.
.
.
$this->load($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;
}
$query->joinWith('user');
$query->joinWith('thesis');
$query->andFilterWhere(['thesis.staff'=> Yii::$app->user->identity->id]);
.
.
.