服务提供商没有'；t在ajax上运行

我在服务提供商中有以下内容：

protected $defer = false;
public function register() {
    $this->app->singleton('User', function ($app) {
        $user = new User();
        $user->setUser(Auth::user() ? Auth::user() : null);
        dd($user);
        return $user;
    });
}

正如您所看到的，我有一个dd()调用，每当我加载页面时，它都会转储传递给它的数据

我在页面上有一个ajax请求，当我发出ajax请求时，dd()甚至不会运行。

因此：

a( 服务提供商在什么时候运行？

b( 我能做些什么来解决我的问题？

编辑

我创建了一个这样的新用户：

public function UserService() {
    $this->app->singleton('User', function ($app) {
        return new User();
    });
}

然后在我的用户服务中，我有这个：

public function __construct(UserModel $user = null){
    if($user === null){
        $this->user = Auth::user();
    }else{
        $this->user = $user;
    }
}
public function getUserId(){
    dd($this->user);
    return isset($this->user->id) ? $this->user->id : null;
}
public function getAcesseId(){
    return isset($this->user->acesse_id) ? $this->user->acesse_id : null;
}

以下是页面加载的结果：

UserModel {#261
  #rules: array:1 [
    "player_tag" => "required|min:3|max:15|regex:/^(?=.*[a-zA-Z]).+$/|regex:/^[a-zA-Z0-9_]+$/"
  ]
  #table: "users"
  #fillable: array:1 [
    0 => "player_tag"
  ]
  #hidden: array:1 [
    0 => "remember_token"
  ]
  #errors: null
  #connection: null
  #primaryKey: "id"
  #perPage: 15
  +incrementing: true
  +timestamps: true
  #attributes: array:6 [
    "id" => 1
    "acesse_id" => 108649
    "player_tag" => "TheColorRed"
    "remember_token" => null
    "created_at" => "2016-03-08 11:31:02"
    "updated_at" => "2016-03-08 11:31:02"
  ]
  #original: array:6 [
    "id" => 1
    "acesse_id" => 108649
    "player_tag" => "TheColorRed"
    "remember_token" => null
    "created_at" => "2016-03-08 11:31:02"
    "updated_at" => "2016-03-08 11:31:02"
  ]
  #relations: []
  #visible: []
  #appends: []
  #guarded: array:1 [
    0 => "*"
  ]
  #dates: []
  #dateFormat: null
  #casts: []
  #touches: []
  #observables: []
  #with: []
  #morphClass: null
  +exists: true
  +wasRecentlyCreated: false
}

下面是来自同一页面的ajax请求的结果：

UserModel {#254
  #rules: array:1 [
    "player_tag" => "required|min:3|max:15|regex:/^(?=.*[a-zA-Z]).+$/|regex:/^[a-zA-Z0-9_]+$/"
  ]
  #table: "users"
  #fillable: array:1 [
    0 => "player_tag"
  ]
  #hidden: array:1 [
    0 => "remember_token"
  ]
  #errors: null
  #connection: null
  #primaryKey: "id"
  #perPage: 15
  +incrementing: true
  +timestamps: true
  #attributes: []
  #original: []
  #relations: []
  #visible: []
  #appends: []
  #guarded: array:1 [
    0 => "*"
  ]
  #dates: []
  #dateFormat: null
  #casts: []
  #touches: []
  #observables: []
  #with: []
  #morphClass: null
  +exists: false
  +wasRecentlyCreated: false
}

由于某些原因，转储中没有包含正确的信息。用户属性在哪里？

这是AJAX请求的控制器：

use App'Services'User;
public function UploadAvatar(User $user){
    $userid = $user->getAcesseId();
    if($userid > 0){
        $md5  = md5($userid);
        $disk = Storage::disk('avatars');
        $file = $md5 . '.png';
        $image = new Imagick();
        $image->readImageBlob(file_get_contents($_FILES['file']['tmp_name']));
        $image->setImageFormat('png');
        $disk->getDriver()->put('tmp/' . $file, $image->getImageBlob(), [
            'visibility' => 'public'
        ]);
        return response()->json(env('URL_AVATARS_TMP') . $file);
    }
    return response()->json(['error' => 'Invalid User'], 500);
}

下面一行是返回的内容：

return response()->json(['error' => 'Invalid User'], 500);