How to return Active Record as json with dependencies in Yii2?

Question

JSON

Yii::$app->response->format = Response::FORMAT_JSON;
$model =  Post::find()->with('comments')->all();
return $model;

gives out json of posts without comments, although if you do var_dump($model) they are there.
Judging by yiiframework.ru/forum/viewtopic.php?f=3&t=6997 in the first version of the framework, this could be solved by rewriting json encode. Are there other options now?

Answer 1

I found the solution myself - to make a selection asArray()
$model = Post::find()->with('comments')->asArray()->all();
In this case, child objects are also translated into json.

Answer 2

fields, extrafields?