Laravel9中$title与$url变量未定义问题求助

我正在开发用户注册表单，将表单实现为Component组件。用户完成注册后会跳转至用户列表页面，编辑个人信息时需跳转回注册表单页面，但此时要使用新的URL与标题。目前从控制器向视图传递数据时，出现$title和$url变量未定义的错误。

注册表单控制器代码 #

public function create(Request $request)
{
    $url = url('/register'); 
    $title = ("Registration Form");
    $data = compact( 'url');
    return view('RegistrationForm')->with($data);
}

public function store (Request $request)
{

    $request->validate(
        [
            'firstname' => 'required',
            'lastname' => 'required',
            'email' => 'required|email',
            'password' => 'required',
            'confirm_password' => 'required|same:password|min:8',
            'address' => 'required',
            'country' => 'required',
            'state' => 'required',
            'city' => 'required',
            'gender' => 'required',
            'tearms_and_conditions' => 'required',
        ],
        [
            'firstname.required' => 'Please enter your First Name',
            'lastname.required' => 'Please nter your Last Name',
            'email.required' => 'Please enter an Email',
            'password.required' => 'Please Enter a Password'
        ],
    );

    $users = new Users;
    $users->firstname = $request['firstname'];
    $users->lastname = $request['lastname'];
    $users->email = $request['email'];
    $users->password = md5($request['password']);
    $users->address = $request['address'];
    $users->country = $request['country'];
    $users->state = $request['state'];
    $users->city = $request['city'];
    $users->gender = $request['gender'];
    $users->date_of_birth = $request['date_of_birth'];
    $users->save();

    return redirect('/register/view');
}

public function view (Request $request)
{
    $users = Users::all();
    $data = compact('users');
    return view('user-view')->with($data);
}

public function delete($id)
{
    $user = Users::find($id);
    echo "<pre>";
    print_r ($user);
    die;
    return redirect('/register/view');
}

public function edit($id)
{
    $user = Users::find($id);
    if (is_null($user)) 
    {
        return redirect('/register/view');
    }
    else 
    {
        $url = url("user/update"."/". $id);
        $title = "Update Details";
        $data = compact('user', 'url', 'title');
        return redirect('/register')->with($data);
    }
}

public function update($id, Request $request)
{
    $user = Users::find($id);
    $users->firstname = $request['firstname'];
    $users->lastname = $request['lastname'];
    $users->email = $request['email'];
    $users->address = $request['address'];
    $users->country = $request['country'];
    $users->state = $request['state'];
    $users->city = $request['city'];
    $users->gender = $request['gender'];
    $users->date_of_birth = $request['date_of_birth'];
    $users->save();

    return redirect('register/view');
}

路由代码 #

Route::get('/register', [RegistrationFormController::class, 'index']);

视图代码 #

<body>
<h1> {{$title}} </h1> 
<x-registration-form-component :country="$country" :url="$url" /> 

注册表单组件（RegistrationFormComponent） #

该组件负责渲染注册/编辑表单的核心UI元素，支持接收country（国家选项列表）、url（表单提交地址）等参数；若处于编辑场景，还需接收user数据用于预填充表单字段。

1. 修复create方法的变量传递 #

create方法中未将$title传入视图，导致视图无法获取该变量，修改如下：

public function create(Request $request)
{
    $url = url('/register'); 
    $title = "Registration Form";
    // 将title加入数据集合
    $data = compact('url', 'title');
    return view('RegistrationForm')->with($data);
}

2. 修正路由映射错误 #

原路由指向不存在的index方法，改为指向create方法，并补充编辑相关路由：

// 注册页面路由
Route::get('/register', [RegistrationFormController::class, 'create']);
// 编辑页面路由
Route::get('/user/edit/{id}', [RegistrationFormController::class, 'edit']);
// 更新提交路由
Route::post('/user/update/{id}', [RegistrationFormController::class, 'update']);

3. 调整edit方法的视图返回逻辑 #

edit方法使用redirect会触发新请求，with传递的数据存入Session而非直接传入视图，改为直接返回表单视图并传递数据：

public function edit($id)
{
    $user = Users::find($id);
    if (is_null($user)) 
    {
        return redirect('/register/view');
    }
    else 
    {
        $url = url("user/update/" . $id);
        $title = "Update Details";
        $data = compact('user', 'url', 'title');
        // 直接返回表单视图，而非重定向
        return view('RegistrationForm')->with($data);
    }
}

4. 修复update方法的变量名错误 #

方法内使用了未定义的$users变量，改为已查询到的$user：

public function update($id, Request $request)
{
    $user = Users::find($id);
    $user->firstname = $request['firstname'];
    $user->lastname = $request['lastname'];
    $user->email = $request['email'];
    $user->address = $request['address'];
    $user->country = $request['country'];
    $user->state = $request['state'];
    $user->city = $request['city'];
    $user->gender = $request['gender'];
    $user->date_of_birth = $request['date_of_birth'];
    $user->save();

    return redirect('register/view');
}

5. 补充$country变量传递（可选） #

若视图需要国家选项数据，需在create和edit方法中添加该变量（假设存在Country模型）：

// 在create和edit方法中加入
$country = Country::all();
$data = compact('url', 'title', 'country', 'user'); // edit方法需包含user

内容的提问来源于stack exchange，提问作者Huzaifa Ahmed