php - Laravel 和依赖注入场景

Question

我有以下代码

class FooBar
{
    protected $delegate;

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

App::bind('FooBar', function()
{
    return new FooBar();
});

class HomeController extends BaseController 
{
    protected $fooBar;

    public function __construct()
    {
        $this->fooBar = App::make('FooBar');
        //HomeController needs to be injected in FooBar class
    }

}

class PageController extends BaseController 
{
    protected $fooBar;

    public function __construct()
    {
        $this->fooBar = App::make('FooBar');
        // PageController needs to be injected in FooBar class
    }

}

如何在 FooBar 类中注入 HomeController、PageController 作为委托？

使用上面的代码，我得到一个缺少的参数错误

Answer 1

Laravel 中的依赖注入就这么简单：

class FooBar
{
    protected $delegate;

    public function __construct( HomeController $delegate )
    {
        $this->delegate = $delegate;
    }
}

App::bind('FooBar', function()
{
    return new FooBar();
});

class HomeController extends BaseController 
{
    protected $fooBar;

    public function __construct()
    {
        $this->fooBar = App::make('FooBar');
    }

}

Home Controller 将被实例化并作为 $delegate 注入。

编辑：

但是如果你需要通过实例化器（你的控制器）来实例化 FooBar，你必须这样做：

<?php

class FooBar
{
    protected $delegate;

    public function __construct( $delegate )
    {
        $this->delegate = $delegate;

        /// $delegate here is HomeController, RegisterController, FooController...
    }
}

App::bind('FooBar', function($app, $param) 
{
    return new FooBar($param);
});

class HomeController extends Controller {

    protected $fooBar;

    public function delegate()
    {
        $this->fooBar = App::make('FooBar', array('delegate' => $this));
    }

}

Answer 2

尝试这个。（http://laravel.com/docs/ioc#automatic-resolution）

class FooBar
{
    protected $delegate;

    public function __construct( HomeController $delegate )
    {
        $this->delegate = $delegate;
    }
}

App::bind('FooBar', function($delegate)
{
    return new FooBar;
});