CourseWork/app/Http/Controllers/GradeController.php

<?php

namespace App\Http\Controllers;

use App\Http\Requests\GradePostRequest;
use App\Models\Grade;
use Illuminate\Http\RedirectResponse;
use Illuminate\View\View;

class GradeController extends Controller
{
    /**
     * Display a listing of the resource.
     */
    public function index(): View
    {
        if(request()->user()->cannot('viewAny', Grade::class)) {
            abort(403);
        }

        return view('grades.index', [
            'grades' => Grade::filter()->paginate(5)->withQueryString(),
        ]);
    }

    /**
     * Show the form for creating a new resource.
     */
    public function create(): View
    {
        if(request()->user()->cannot('create', Grade::class)) {
            abort(403);
        }

        return view('grades.create');
    }

    /**
     * Store a newly created resource in storage.
     */
    public function store(GradePostRequest $request): RedirectResponse
    {
        if(request()->user()->cannot('create', Grade::class)) {
            abort(403);
        }

        return redirect()->route('grades.show', Grade::create($request->validated()));
    }

    /**
     * Display the specified resource.
     */
    public function show(Grade $grade): View
    {
        if(request()->user()->cannot('view', $grade)) {
            abort(403);
        }

        return view('grades.show', [
            'grade' => $grade,
            'subjects' => $grade->subjects,
        ]);
    }

    /**
     * Show the form for editing the specified resource.
     */
    public function edit(Grade $grade): View
    {
        if(request()->user()->cannot('update', Grade::class)) {
            abort(403);
        }

        return view('grades.edit', [
            'grade' => $grade,
        ]);
    }

    /**
     * Update the specified resource in storage.
     */
    public function update(GradePostRequest $request, Grade $grade): RedirectResponse
    {
        if(request()->user()->cannot('update', Grade::class)) {
            abort(403);
        }

        return redirect()->route('grades.show', $grade->update($request->validated()));
    }

    /**
     * Remove the specified resource from storage.
     */
    public function destroy(Grade $grade): RedirectResponse
    {
        if(request()->user()->cannot('delete', Grade::class)) {
            abort(403);
        }

        $grade->delete();

        return redirect()->route('grades.index');
    }
}