Dependency Injection in Symfony

Question

I'm building Symfony 3.3 application. I have a helper in a Console folder:

abstract class AbstractHelper implements HelperInterface
{
    protected $httpClient;

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

And I have implementation of HttpInterface named HttpGuzzle into Service folder. How could I help Symfony to figure out I want to inject HttpGuzzle into AbstractHelper constructor? I tried to add these line to services.yml but it doesn't work:

AppBundle\Command\AbstractHelper:
    arguments:
        $httpClient: AppBundle\Service\HttpGuzzle

If i run the tests it throws an error:

ArgumentCountError: Too few arguments to function AppBundle\Command\AbstractHelper::__construct(), 
0 passed in ~/Projects/app/tests/AppBundle/Console/HelperTest.php 
on line 17 and exactly 1 expected

With this:

helper:
    class: AppBundle\Command\AbstractHelper:
    arguments: [AppBundle\Service\HttpGuzzle]

I get an error:

You have requested a non-existent service "helper".

Francesco Abeni · Accepted Answer · 2017-06-24 17:00:34Z

1

In services.yml You have to define the HttpGuzzle service itself, like this:

httpguzzle:
    class: AppBundle\Service\HttpGuzzle

Then you can use pass it to the helper like this:

helper:
    class: AppBundle\Command\AbstractHelper
    arguments: ["@httpguzzle"]

answered Jun 24, 2017 at 17:00

Francesco Abeni

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2 Comments

James May Over a year ago

Thanks. I just handled this issue. But seems it doesn't work when I trying to get service from the tests. static::createClient()->getContainer()->get('helper'); I get the same error about non-existent service.

Francesco Abeni Over a year ago

Are you sure it's the same error? Can you post it? The fact that you're trying to instance an abstract class may have something to do with it.

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