How to order messages by dates in Laravel

Im building the chat section of my app with vueJs and laravel backend. I want to fetch my messages grouped by days. So when messages display, I want them to look something like this.

  `Today
  **All messages sent and received today, ordered by time**
   Yesterday
   **Yesterday's messages**
   9/12/2018
  **Messages for that day**

In my Chat model, I wrote an accessor for this like so;

public function getMessagesAttribute(){ return $this ->groupBy(function($q){ return $q->created_at->format('Y-m-d'); });

However, this does not give anything different from what I got when I use orderBy('created_at', 'ASC') in the controller. I will appreciate any assistance/guidance to achieve what I want please.

via Chebli Mohamed