Symofny 3 - parent::__construct() cant be injected - php

Question

I am trying to inject one service into another to call function from it but it throws an error:
Type error: Argument 1 passed to App\Base\Service\Shop\ShopService::__construct() must be an instance of App\Base\Service\AccountService, instance of ContainerSgqv3vy\appDevDebugProjectContainer given
And I think I implement everything correctly:
use App\Base\Service\AccountService;
use App\Base\Service\BaseService;
class ShopService extends BaseService
{
/**
* #param AccountService $accountService
*/
public function __construct(AccountService $accountService)
{
parent::__construct();
$this->accountService = $accountService;
}
And calling in my function from it:
this->accountService->getMyFunction();
And my instantiated class :
class BaseService
{
/** #var ContainerInterface */
var $container;
var $em;
public function __construct(ContainerInterface $container, EntityManagerInterface $em)
{
$this->container = $container;
$this->em = $em;
}
service.yml
app.shop:
class: App\Base\Service\ShopService
arguments: ["#service_container", "#doctrine.orm.default_entity_manager"]
public: true

Answer 1

When you extend a class that has constructor arguments, you should keep those arguments and add any extra argument after.
Example:
class BaseClass
{
public function __construct(Foo $foo, Bar $bar) {
// ....
}
}
To instantiate this class, you would need to pass the container and the entity managaer:
$base = new BaseClass($fooInstance, $barInstance);
If you want to extend this class, it will most likely still need those dependencies + our new dependency:
class ChildClass extends BaseClass
{
public function __construct(Foo $foo, Bar $bar, Duck $duck)
{
// The parent (BaseClass) requires Foo and Bar,
// or it will throw an error
parent::__construct($foo, $bar);
$this->duck = $duck;
}
}
To instantiate our new ChildClass, we would need to pass three arguments:
$child = new ChildClass($fooInstance, $barInstance, $duckInstance);
Then, when you define our ChildClass in the service.yml, you need to have define all three dependencies:
app.childclass:
class: ChildClass
arguments: ["Foo", "Bar", "Duck"]
...
Since I'm not using Symfony myself, you must excuse for not knowing the exact syntax of service.yml, but the concept is the same.