exam/app/Http/Controllers/AdminController.php

<?php

namespace App\Http\Controllers;

use App\Models\Application;
use Illuminate\Http\Request;

class AdminController extends Controller
{
    public function index(Request $request) {
        $filterStatus = $request->input('status', 'all');
        $per_page = $request->input('per_page', '10');

        $query = Application::with('user', 'course')->orderBy('updated_at', 'desc');

        if ($filterStatus !== 'all') {
            $query->where('status', $filterStatus);
        }

        $applications = $query->paginate($per_page);

        return view('admin.index', compact('applications', 'filterStatus'));
    }

    public function updateStatus(Request $request, $id) {
        $request->validate([
            'status' => ['required']
        ]);

        $application = Application::findOrFail($id);
        $oldStatus = $application->status;
        $application->status = $request->status;
        $application->save();

        return redirect()
        ->back()
        ->with('success', "Статус заявки '$id' изменен с '$oldStatus' на '$application->status'");
    }
}