I am getting the following error:

Warning: Missing argument 1 for Drupal\custom_forms\Service\CustomFormsService::__construct(), called in /drupal/docroot/core/lib/Drupal/Component/DependencyInjection/Container.php on line 264 and defined in Drupal\custom_forms\Service\CustomFormsService->__construct() (line 13 of modules/custom_forms/src/Service/CustomFormsService.php).

And my code (service.php) is:

public function __construct($request) {
$this->cityname = \Drupal::request()->get('cityname');

if($this->cityname != ''){
  $result = \Drupal::database()->select('city_municipality','cm')
    ->condition('city', $this->cityname)
    $result = json_encode($result);
    print $result; 


           class: Drupal\custom_forms\Service\CustomFormsService

But the form functionalities are working fine.

Can anyone help me out on this?

  • Is this a service class or a form class? If it's a service class, what does your custom_forms.services.yml file look like? If it's a form class, do you have a function named create() in the class? If so, please show it.
    – Jaypan
    Feb 7, 2017 at 11:59
  • custom_forms.services.yml services: custom_forms.custom_forms_service: class: Drupal\custom_forms\Service\CustomFormsService
    – ancy
    Feb 7, 2017 at 12:01

1 Answer 1


You need to add an argument to your services.yml for the class to be injected:

    class: Drupal\custom_forms\Service\CustomFormsService
      - @request_stack

Note that you should make a few changes to your service as well:

First, add an type hint for the argument:

public function __construct(\Symfony\Component\HttpFoundation\RequestStack $requestStack) {

Next, you will use the $requestStack instead of Drupal::request():

$this->cityname = $requestStack->getCurrentRequest()->query->get('cityname');
  • I am getting the following error :Recoverable fatal error: Argument 1 passed to Drupal\custom_forms\Service\CustomFormsService::__construct() must be an instance of Symfony\Component\HttpFoundation\RequestStack, none given, called in /drupal/docroot/core/lib/Drupal/Component/DependencyInjection/Container.php on line 264 and defined in Drupal\custom_forms\Service\CustomFormsService->__construct() (line 14 of modules/custom_forms/src/Service/CustomFormsService.php).
    – ancy
    Feb 7, 2017 at 12:19
  • You need to clear your cache.
    – Jaypan
    Feb 7, 2017 at 12:22
  • I am getting the following error while clearing my cache..Fatal error: Call to undefined method Symfony\Component\HttpFoundation\RequestStack::get() in /drupal/docroot/modules/custom_forms/src/Service/CustomFormsService.php on line 16
    – ancy
    Feb 7, 2017 at 12:28
  • Sorry, I think I had an error. I've updated the code. I should probably test before posting!
    – Jaypan
    Feb 7, 2017 at 12:33
  • 1
    That has nothing to do with the current topic. So please mark this one as solved, and open a new topic for that error.
    – Jaypan
    Feb 7, 2017 at 12:53

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