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.php

Route::get('{locale}/projects/{id}/billings', 'ProjectController@showbilling')

     ->name('showbilling');

Route::post('{locale}/projects/{id}', 'ProjectController@addbilling')

     ->name('addbilling');

项目控制器.php

public 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.php

Route::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');  

});