exam/app/Http/Controllers/ApplicationController.php

<?php

namespace App\Http\Controllers;

use Illuminate\Support\Facades\Auth;
use App\Models\Application;
use App\Models\Course;
use Illuminate\Http\Request;

class ApplicationController extends Controller
{
    public function index() {
        $applications = Auth::user()
        ->applications()
        ->with('course')
        ->orderBy('created_at')
        ->get();

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

    public function create() {
        $courses = Course::all();

        return view('applications.create', compact('courses'));
    }

    public function store(Request $request) {
        $request->validate([
            'course_id' => ['required', 'exists:courses,id'],
            'date_start' => ['required', 'date', 'after_or_equal:today'],
            'payment_method' => ['required'],
        ]);

        Application::create([
            'user_id' => Auth::id(),
            'course_id' => $request->course_id,
            'date_start' => $request->date_start,
            'payment_method' => $request->payment_method,
        ]);

        return redirect()
        ->route('applications.index')
        ->with('success', 'Заявка успешно создана!');
    }
}