Laravel 服务层类中的依赖注入

Question

In my Laravel 6.9.0 app, I have some code which I need to run from many places, so I'm working on creating this as a service layer.

I've created the file /app/Actions/Music/GetRecentArtists.php and added it to my composer autoload config:

<?php

namespace App\Actions\Music;

use \Barryvanveen\Lastfm\Lastfm;

class GetRecentArtists {

    public function get(Lastfm $lastfm)
    {
        return true;
    }

}

But when I run it in Tinker using:

(new App\Actions\Music\GetRecentArtists())->get()

I get the following error:

TypeError: Too few arguments to function App/Actions/Music/GetRecentArtists::get(), 0 passed in Psy Shell code on line 1 and exactly 1 expected

I'd thought that dependency injection would inject the Lastfm instance. When I remove the function argument, it runs fine.

Answer 1

如果你使用resolve方法，Laravel 服务容器应该为你注入依赖：

resolve('App\Actions\Music\GetRecentArtists')