按相同字段分组并显示为1分区

I have a collection returning messages, however, I want to group them by 'subjects' and 'sender' to create 1 div for each subject, and show the latest one's created_at.

So I have:

id | senderId | receiverId | subject | message | created_at

My Controller:

 $messages = Message::where('receiverId', \Auth::user()->name)
                 ->orderBy('created_at','desc')
                 ->paginate(10); 

  return view('chat')->with(compact('messages'));

So this works: dd($messages[0]->subject). Also, in my view, I can use @foreach to use it as $message->created_at. Currently it seems like this (subjects are not listed):

*yIZgT0oqH - is name

enter image description here

How can I group them by subject and senderId, and show them as 1 group(1 div) by using the latest message (created_at)? What is the best way?

You can modify your query to do something like this, using groupBy / aggregation.

$messages = Message::where('receiverId', \Auth::user()->name)
                 ->groupBy('subject')
                 ->orderBy('created_at','desc')
                 ->paginate(10);

Check the documentation for the same - http://laravel.com/docs/5.1/queries#ordering-grouping-limit-and-offset