exchange/app/Http/Controllers/NotificationController.php

<?php

namespace App\Http\Controllers;

use Illuminate\Http\Request;
use App\Notification;
use Illuminate\Support\Facades\DB;
use Auth;

class NotificationController extends Controller
{
    public function index()
    {
        return Notification::all()->orderby('updated_at','desc');
    }

    public function show(Notification $notification)
    {
     	return $notification;
    }

    public function store(Request $request)
    {
        $notification = Notification::create($request->all());

        return response()->json($notification, 201);
    }

    public function update(Request $request, Notification $notification)
    {
        $notification->update($request->all());

        return response()->json($notification, 200);
    }

    public function delete(Notification $notification)
    {
        $notification->delete();

        return response()->json(null, 204);
    }

    public function getUserMessage()
    {
    	return response()->json([
    		"message"			=>Notification::Where("user_id",Auth::user()->id)->orderby('updated_at','desc')->get(),
			"unread_message"	=>Notification::Where([
    			["user_id",Auth::user()->id],
				["is_read",0]
			])->orderby('updated_at','desc')->get()
		],200);
    }

    public function readNotification($notification_id){
    	$affected = DB::table('notifications')
            ->Where('id', $notification_id)
            ->update(array('is_read' => 1));
    	return response()->json("Read message", 200);
    }
}