ldc-crm/app/Http/Controllers/BrandController.php

<?php

namespace App\Http\Controllers;

use App\Http\Controllers\Controller;
use App\Models\Brand;
use Illuminate\Http\Request;

class BrandController extends Controller
{
    public function index()
    {
        $brands = Brand::all();
        return view('brands.index', compact('brands'));
    }

    public function manage(Request $request, $id = null)
    {
        $brand = null;

        if ($id !== null) {
            $brand = Brand::find($id);
        }

        if ($_SERVER['REQUEST_METHOD'] === 'POST') {
            $request->validate([
                'name' => 'required|max:255',
            ]);

            if (!$brand) {
                $brand = new Brand();
            }

            $brand->name = filter_var($request->name, FILTER_SANITIZE_STRING);
            $brand->save();

            return redirect()->route('brands')->with('success', 'Modifications enregistrées !');
        }

        return view('brands.manage', compact('brand'));
    }
}