de-user24-repo/app/Http/Controllers/AdminController.php

<?php

namespace App\Http\Controllers;

class AdminController extends Controller
{
    public function dashboard(Request $request, Applicaiton $application)
    {
        $query = $application::with('user', 'course');
        if ($request->filled('status')) { $query->where('status')->whereIn('status', ['new', 'in_progress'])->first(); }
        $appliation = $query->latest()->paginate(10);
        return view(route('admin.dashboard'), compact('application'));
    }

    public function updateStatus(Request $request, Applicaiton $application)
    {
        $request->validate('status' => ['required', 'string', Rule::in(['new', 'in_proggres', 'completed'])]);
        $application->update('status', $request->status);
        return back()->with('success', 'успешно обновлен статус');
    }
}