如何在PHP Laravel 5.x中编辑后保存以前的MySQL字段条目？

Route::get('/edit/{id}', 'ItemController@edit');
Route::post('/update/{id}', 'ItemController@update');

php artisan make:controller ItemController

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

class ItemController extends Controller
{
    public function edit($id)
    {
        $item = Item::find($id);
        return view('edit', compact('item'));
    }

    public function update(Request $request, $id)
    {
        $item = Item::find($id);
        $item->field = $request->input('field');
        $item->save();
        return redirect('/edit/'.$id)->with('success', 'Item updated successfully.');
    }
}

<form method="POST" action="/update/{{ $item->id }}">
    @csrf
    <input type="text" name="field" value="{{ $item->field }}">
    <button type="submit">Save</button>
</form>

php artisan serve