Laravel依赖注入Auth ::

Question

I have a laravel project with a CalendarService and I inject that service into my controller. In the constructer I do something like this:

CalendarService.php

/** @var Collection|Timelog[] */
private $timelogs;

public function __construct()
{
    $this->currentRoute = URL::to( '/' ) . "/home";
    $this->timelogs     = Auth::user()->timelogs()->get();
    $this->currentDay   = 0;
}

HomeController.php

/** @var CalendarService */
protected $calenderService;

public function __construct
(
    CalendarService $calendarService
)
{
    $this->calenderService = $calendarService;
}

And I get this error

Call to a member function timelogs() on null

About this line of code:

Auth::user()->timelogs()->get();

I have used the use Illuminate\\Support\\Facades\\Auth; in my service

What is going on here?

Answer 1

The issue is (as pointed out in https://laracasts.com/discuss/channels/laravel/cant-call-authuser-on-controllers-constructor ) the fact that the Auth middleware is not initialized during the controller construction phase.

You can instead do this though:

protected $calenderService;

public function __construct()
{ 
    $this->middleware(function ($request,$next) {        
         $this->calenderService = resolve(CalendarService::class);
         return $next($request);
     });
}

Alternative

public function controllerMethod(CalendarService $calendarService) { 
    //Use calendar service normally
}

Note: This assumes that you're able to resolve the CalendarService via the service container.

Answer 2

You can't use auth() or Auth:: in a constructor in the latest versions of Laravel, so you'll need to use this logic directly in the method.

public function someMethod()
{
    $timelogs = Auth::user()->timelogs()->get();