What is the correct way to display the number of unread messages in yii2?

Question

Yii

Hello.
Tell me how to do it right.
There is a small chat, messages are stored in the database.
There is a place in the header where you need to display the number of unread messages (the header is located separately in the layout).
I can only imagine such an implementation, in each controller we make a request to the database and display it in the layout.
But this will have to duplicate the code in each controller.

Answer 1

Option 1:
In the application config

'on beforeAction' => function(){
      //Ваш код который будет работать перед любым экшеном
    },

Option 2:
create a controller, inherit the rest from it. And it has the same beforeAction.
You can make a component and pull it, since it is needed at any application launch - this is a normal practice. In on beforeAction, we run its method, which receives and possibly caches data. Then we pass the data from it to the widget.

Answer 2

Make a widget. In it, write code to calculate the number of unread messages. And in the layout, just render this widget. You don't need to duplicate anything.