Yii2 Multi DataProvider

adicione
"karataserkan/yii2-multi-dataprovider": "*"
à requireseção de seu composer.jsonarquivo.

use karataserkanyii2MultiDataProviderMultiDataProvider;

$data1
= new ActiveDataProvider([
'query' => $query,
]);

$data2
= new ArrayDataProvider([
'allModels' => [...],
]);

$dataProvider
= new MultiDataProvider([
'dataProviders' => [$data1,$data2],
]);