如何在Laravel 5.6中使用old（）函数在表单中提交后保留所选选项

Question

我已经在网上研究了很多例子以保留所选择的选项。但是，它对我没有用。我的例子如下所示： -

form in blade.html

<form method="get" action="">   
    <select name="developer" id="developer" required="">    
      @foreach($developer_option as $key => $data)
      <option value="{{$data->id}}" @if (old('developer') == $data->id) selected @endif>{{$data->developer_name}}</option>
      @endforeach
    </select>

    <input type="submit" name="submit" value="check" class="btn btn-sm mt-4">
</form>

从上面的表单中，我想在选项标记中使用@if (old('developer') == $data->id) selected @endif保留所选选项。

这是我的控制器

    use App\Model\Developer;
    class DeveloperController extends Controller
    {

        public function index(Request $request)
        {
            $selected_developer_id = $request->input('developer');
            $from = $request->input('from_developer');
            $to = $request->input('to_developer');
            $developer_option = Developer::orderBy('developer_name','asc')->select('developer_name','id')->get();

            return view('SAM.Developer.developer',compact('developer_filtered','developer_option'));
        }
}

但是，在我点击提交表单后，选择器没有显示我选择的选项。