dependency injection in lumen

Question

I'm trying to understand dependency injection in lumen

I want to add userService

{
    protected $userService;
    public function __construct(UserService $userService, $config)
    {
        $this->userService = $userService;
    }

apply it here: Console/Commands/Command2.php

    $server = app(Server::class, [$config]);

getting an error

In Container.php line 993: Unresolvable dependency resolving [Parameter #1 [ $config ]] in class App\SocketServer\Server

Answer 1

Dependencies with parameters can be configured in service providers. A service provider can be generated by running:

php artisan make:provider UserServiceProvider

Modifying the setup method in the UserServiceProvider.php file

    public function register()
    {
        $this->app->singleton(UserService::class, function ($app) {
            $config = ['debug' => true];
            return new UserService($config);
        });
    }

registering it in config/app.php:

'providers' => [
    // Other Service Providers

    App\Providers\UserServiceProvider::class,
],

And then Laravel will be able to inject the dependency:

    protected $userService;
    public function __construct(UserService $userService)
    {
        $this->userService = $userService;
    }