Yii2 DetailView relations group_concat?

Question

Yii

Hello.
My problem is this.
I am writing in Yii2.
In the data provider for the GridView, there is a request with "joinwith".
In fact, it pulls data from another table, implementing the first normal form ( https://ru.wikipedia.org/wiki/First_normal_form ).
The jamb is that if, say, we have 10 records, each of which has 3 tags, then the widget claims that we have displayed 30 records. In normal SQL, this would be solved by group_concat. What to do here?

Answer 1

I decided myself.
It was enough to add ->groupBy('id');