Yii2 - Intercept Render Action - yii2

Question

I'm writing Yii2 basic application. Sometimes I have to render the views when an action of a controller is accessed as partials, sometimes I have to render them with the layout. This is based on a GET parameter in the request so my code in an action looks like this:
public function actionIndex() {
$isApi = Yii::$app->request->get('api');
$dataProvider = new ActiveDataProvider([
'query' => Participant::find(),
]);
if ($isApi) {
return json_encode($this->renderPartial('index', [
'dataProvider' => $dataProvider,
]));
} else {
return $this->render('index', [
'dataProvider' => $dataProvider,
]);
}
}
I have exactly the same logic for each action in each controller. I have to first check the GET request for the api variable and then based on that I call either the render or renderPartial function.
Is there a way to intercept the render part in each action and write this code to work globally for each action instead of copy and pasting it everywhere?

Answer 1

You can write method for this:
public function actionIndex() {
$dataProvider = new ActiveDataProvider([
'query' => Participant::find(),
]);
return $this->renderForApi('index', [
'dataProvider' => $dataProvider,
]);
}
protected function renderForApi($view, $params = []) {
$isApi = Yii::$app->request->get('api');
if ($isApi) {
return $this->asJson($this->renderPartial($view, $params));
}
return $this->render($view, $params);
}
You can put renderForApi() method into parent controller in your app or put it into trait and use it in every controller.