Laravel中间件将变量返回给控制器 [英] Laravel Middleware return variable to controller
问题描述
我正在对用户进行权限检查,以确定他们是否可以查看页面.这涉及到首先通过一些中间件传递请求.
I am carrying out a permissions check on a user to determine whether they can view a page or not. This involves passing the request through some middleware first.
我遇到的问题是在将数据返回到视图本身之前,我正在中间件和控制器中复制相同的数据库查询.
The problem I have is I am duplicating the same database query in the middleware and in the controller before returning the data to the view itself.
以下是设置示例;
-routes.php
-- routes.php
Route::get('pages/{id}', [
'as' => 'pages',
'middleware' => 'pageUser'
'uses' => 'PagesController@view'
]);
-PageUserMiddleware.php(PageUserMiddleware类)
-- PageUserMiddleware.php (class PageUserMiddleware)
public function handle($request, Closure $next)
{
//get the page
$pageId = $request->route('id');
//find the page with users
$page = Page::with('users')->where('id', $pageId)->first();
//check if the logged in user exists for the page
if(!$page->users()->wherePivot('user_id', Auth::user()->id)->exists()) {
//redirect them if they don't exist
return redirect()->route('redirectRoute');
}
return $next($request);
}
-PagesController.php
-- PagesController.php
public function view($id)
{
$page = Page::with('users')->where('id', $id)->first();
return view('pages.view', ['page' => $page]);
}
如您所见,在中间件和控制器中都重复了Page::with('users')->where('id', $id)->first()
.我需要将数据从一个传递到另一个,以免重复.
As you can see, the Page::with('users')->where('id', $id)->first()
is repeated in both the middleware and controller. I need to pass the data through from one to the other so an not to duplicate.
推荐答案
我相信(在Laravel 5.x中)执行此操作的正确方法是将自定义字段添加到attributes属性.
I believe the correct way to do this (in Laravel 5.x) is to add your custom fields to the attributes property.
从源代码注释中,我们可以看到属性用于自定义参数:
From the source code comments, we can see attributes is used for custom parameters:
/**
* Custom parameters.
*
* @var \Symfony\Component\HttpFoundation\ParameterBag
*
* @api
*/
public $attributes;
因此,您可以按以下方式实现此目标;
So you would implement this as follows;
$request->attributes->add(['myAttribute' => 'myValue']);
然后您可以通过调用以下内容来检索属性:
You can then retrieved the attribute by calling:
\Request::get('myAttribute');
或者来自laravel 5.5+中的请求对象
Or from request object in laravel 5.5+
$request->get('myAttribute');
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