Silex控制器依赖注入

Question

I'm trying to inject a dependency into my Silex Controller, because I need an object of type user in my controller and handle some stuff with it.

$app->mount("/users", new \MyApp\Controller\Provider\User($user));

And I implemented the controller by implementing the ControllerProviderInterface:

class User implements ControllerProviderInterface{
    protected $user;

    public function __construct($user){
        //...
    }

    public function connect(Application $app)
    {
        //...
    }
}

The routes and the methods are all set up in the controller. Without the dependency injection everything works fine. But as long as I edit the code and add the injection I get the following error:

Missing argument 1 for ...::__construct()

When I create the object, I send that parameter to it, but somehow Silex creates an instance before with a constructor without passing any argument.

Answer 1

Another approach is to use a ServiceController instead of a ControllerProvider. You can achieve a more familiar dependency injection feel this way.

$app->register(new Silex\Provider\ServiceControllerServiceProvider());

$app["user"] = function () {
    return new User();
};
$app["user.controller"] = function () use ($app) {
    return new UserController($app["user"]);
};

$app->get("/users/{id}", "user.controller:get");

...

class User implements UserInterface
{
    // ...
}

...

class UserController
{
    protected $user;

    public function __construct(UserInterface $user)
    {
        $this->user = $user;
    }

    public function get(Request $request, $id)
    {
        $this->user;

        // Do stuff
    }
}

Reference: http://silex.sensiolabs.org/doc/providers/service_controller.html