Using Interfaces And DI In Yii Controllers

Question

I want to work with Interfaces and Dependency Injection in my Yii 1.1.14 project. Here is the demo code that I have:

The interface:

interface IUserInterface
{   
    public function DoSomething();
}

The class:

class UserService implements IUserInterface
{
    public function DoSomething()
    {
        echo "TEST TEST";
    }
}

Now comes the part that is problematic for me. How do I inject the interface in my controller?

I have tried this:

class AccountController extends Controller
{       
    protected $userService;

    public function __construct(IUserInterface $userInterface) 
    {
        $this->userService = $userInterface;

        parent::__construct();
    }    

    public function actionTest()
    {
        $this->userService->DoSomething();
    }
}

but this won't work, because of CController constructor:

public void __construct(string $id, CWebModule $module=NULL)

What should I do, so I can use the interface in my controller?

I asked the same question on the Yii forum, but we ended up going in circles: http://www.yiiframework.com/forum/index.php/topic/52810-using-interfaces-and-di-in-yii-controllers/

In Yii it is better to create your UserService as an ApplicationComponent and use it everywhere like this Yii::app()->userService without DI — Andrii Mishchenko
– Andrii Mishchenko, Commented Mar 27, 2014 at 14:14
Now, it can be done easily in Yii 2. Check this : stackoverflow.com/questions/28753235/… — sudip
– sudip, Commented Jul 4, 2015 at 13:30

darkheir · Accepted Answer · 2014-03-27 14:09:08Z

1

It's not easy to use dependency injection in Yii since the framework hasn't been created with the idea to use it.

There is one extension letting you use dependency Injection: http://www.yiiframework.com/extension/yiipimple

I havn't tried it so I can't tell you if this extension is answering to your needs.

answered Mar 27, 2014 at 14:09

darkheir

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3 Comments

Matthieu Napoli Over a year ago

This doesn't look a lot like dependency injection, but rather like service location. You end up fetching things from the container, not injecting them in the controller.

darkheir Over a year ago

Yeah, it's true. I think you can't perform real dependency injection in Yii whitout modifying the core of the framework. But I think this service locator is the best that you can get in Yii-1. You can have a separation of concerns by using it.

Matthieu Napoli Over a year ago

Agreed :) The only way to do otherwise is through extending the framework

Matthieu Napoli · Accepted Answer · 2014-03-28 09:21:40Z

1

This is the same problem with Zend Framework 1: the framework uses the constructor so you can't use it for dependency injection.

What I have done to integrate PHP-DI in ZF1 is I override the "Dispatcher" of the framework, that is the object which is responsible to create the controller.

By overriding it, I can control how the controller is created and thus inject dependencies.

Have a look here: https://github.com/mnapoli/PHP-DI-ZF1

answered Mar 28, 2014 at 9:21

Matthieu Napoli

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