控制器返回空白数据

Question

控制器返回空白数据/视图，我认为我的路线有问题。如果我删除{locale}，则检索数据。当我的路线中有数据时，任何人都可以帮助正确返回数据{locale}吗？这是我的相关代码：网页.phpRoute::get('{locale}/projects/{id}/billings', 'ProjectController@showbilling')     ->name('showbilling');Route::post('{locale}/projects/{id}', 'ProjectController@addbilling')     ->name('addbilling');项目控制器.phppublic function showbilling($id){    $billings = Project::find($id);    $locale = app()->getLocale();    return $billings;    //return view('admin.addbillings', compact('billings'));}编辑：这是我的完整 web.php网页.phpRoute::get('/', function() {    return redirect(app()->getLocale());});Route::group(['prefix' => '{locale}', 'where' => ['locale' => '[a-zA-Z]{2}'], 'middleware' => 'setlocale'], function () {    Route::get('/', function () {    return view('welcome');    })->name('main');    Auth::routes();    Route::get('/home', 'HomeController@index')->name('home');    //Customers    Route::get('/customers', 'CustomerController@showcust')->name('customers');    Route::post('/sendcust', 'CustomerController@sendcust')->name('sendcust');    //Items    Route::get('/items', 'ItemController@showitems')->name('items');    Route::post('/senditem', 'ItemController@senditem')->name('senditem');    //Projects    Route::get('/projects', 'ProjectController@showprojects')->name('projects');    Route::post('/sendproj', 'ProjectController@sendproj')->name('sendproj');    //ProjectBillings    Route::get('/projects/{id}/billings', 'ProjectController@showbilling')->name('showbilling');    Route::post('/projects/{id}', 'ProjectController@addbilling')->name('addbilling');  });