Laravel 5 目标不可实例化
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Laravel 5 target is not instantiable
提问by Hak
Multiple questions already asked about this topic, but I still have this problem and I don't have a clue on what the problem is.
关于这个主题已经提出了多个问题，但我仍然有这个问题，我不知道问题是什么。
I want to achieve that I can instantiate an interface instead of an implementation.
我想实现我可以实例化一个接口而不是一个实现。
I'm using Laravel 5, this is the code/structure:
我正在使用 Laravel 5，这是代码/结构：
In app, I have created a Contracts folder. In this folder I have Messenger.php:
在应用程序中，我创建了一个 Contracts 文件夹。在这个文件夹中，我有 Messenger.php：
Messenger.php
信使.php
<?php namespace App\Contracts;
interface Messenger {
public function goodmorning($name);
}
In app/Services I have DailyMessenger.php
在应用程序/服务中，我有 DailyMessenger.php
<?php namespace App\Services;
use App\Contracts\Messenger;
class DailyMessenger implements Messenger {
public function goodmorning($name)
{
return 'Goodmorning '. $name;
}
}
Now I want to instantiate the interface in my controller:
现在我想在我的控制器中实例化接口：
public function __construct(Messenger $messenger)
{
$this->messenger = $messenger;
}
Now, if I follow the documentation on the Laravel website I should only have to register this in the service container, which I do in the existing AppServiceProvider.php
现在，如果我遵循 Laravel 网站上的文档，我只需要在服务容器中注册它，我在现有的AppServiceProvider.php 中这样做
public function register()
{
$this->app->bind(
'Illuminate\Contracts\Auth\Registrar',
'App\Services\Registrar'
);
$this->app->bind('App\Contacts\Messenger', 'App\Services\DailyMessenger');
}
If I visit appropriate route that maps to the controller I get the error:
如果我访问映射到控制器的适当路由，我会收到错误消息：
BindingResolutionException in Container.php line 785:
Target [App\Contracts\Messenger] is not instantiable.
I think I have followed the Laravel docs precisely but what am I missing? Thanks in advance :-)
我想我已经准确地遵循了 Laravel 文档，但我错过了什么？提前致谢 ：-）
回答by Dan Krieger
Looks like you've spelled the namespace wrong when binding, used App\Contacts instead of App\Contracts. Should be:
看起来您在绑定时拼错了命名空间，使用了 App\Contacts 而不是 App\Contracts。应该：
$this->app->bind('App\Contracts\Messenger', 'App\Services\DailyMessenger');
