依赖注入

Question

我有这个密码

控制器

<?php

namespace App\Exchange\Helpers;

use App\Contracts\Exchange\Notification;

class Locker
{
    protected $notification;

    public function __construct(Notification $notification)
    {
        $this->notification = $notification;
    }

    public function index()
    {
        return $this->notification->sendMessage('test');
    }

接口

<?php

namespace App\Contracts\Exchange;

interface Notification
{
    public function sendMessage($message);
}

文件Kernel.php

namespace App\Providers;

use App\Contracts\Exchange\Notification;
use App\Exchange\Helpers\Notification\Telegram;
use Illuminate\Http\Request;
use Illuminate\Support\ServiceProvider;

class AppServiceProvider extends ServiceProvider
{
    /**
     * Register any application services.
     *
     * @return void
     */
    public function register()
    {
        $this->app->bind(Notification::class, function (){
            return new Telegram(env('TELEGRAM_EXCHANGE_TOKEN'), env('TELEGRAM_EXCHANGE_CHAT_ID'));
        });
    }

如果我尝试使用新的Locker()；，就会得到一个TypeError错误:对于函数App\Exchange\Helpers\Locker::__construct()来说，参数太少了，0在第1行的Psy Shell代码中传递，而确切地说是1期望的。

Answer 1

您的控制器应该扩展Illuminate\Routing\Controller，以便依赖注入工作。或者使用__construct助手重构您的app方法：

<?php

namespace App\Exchange\Helpers;

use App\Contracts\Exchange\Notification;

class Locker
{
    protected $notification;

    public function __construct()
    {
        $this->notification = app(Notification::class);
    }

    public function index()
    {
        return $this->notification->sendMessage('test');
    }
}