Yii2. How to set scenario in dataProvider? - yii2

Question

I want to return different fields depends on scenario. How can I set it in dataProvider?
$query = User::find();
$activeData = new ActiveDataProvider([
'query' => $query,
'pagination' => [
'pageSize' => 10,
],
]);
Fields in User model:
public function fields()
{
if ($this->scenario == 'statistics') {
return [
'id',
'email',
'count'
];
}
return [
'id',
'name'
];
}

Answer 1

What about using the $select property?
$query = User::find()->select(['id','email','count']);
$activeData = new ActiveDataProvider([
'query' => $query,
'pagination' => [
'pageSize' => 10,
],
]);
Or even better, create an ActiveQuery class for them:
class UserQuery extends ActiveQuery
{
public function statistics()
{
return $this->select(['id','email','count']);
}
/* add as many filtering functions as you need here */
}
Then override the find() method in the User class to use it:
public static function find()
{
return new \app\models\UserQuery(get_called_class());
}
Then do:
$activeData = new ActiveDataProvider([
'query' => User::find()->statistics(),
'pagination' => [
'pageSize' => 10,
],
]);
Note: In default implementation of Yii2 RESTful API you can also select the required fields within url by doing: GET /users?fields=id,email,count

Answer 2

Simply get all the models using getModels() method, set scenario for all of them in the loop and then return data provider. Your example will change into following code:
$query = User::find();
$activeData = new ActiveDataProvider([
'query' => $query,
'pagination' => [
'pageSize' => 10,
],
]);
foreach($activeData->getModels() as $model) {
$model->scenario = 'statistics';
}
return $activeData;