constructor injection in symfony

Question

i want to use Request class in my constructor and this is the error it gives to me while i want to run server:

Cannot autowire service "AppBundle\Controller\DetectServiceDetailController": argument "$request" of method "__construct()" references class "Symfony\Component\HttpFoundation\Request" but no such service exists. It cannot be auto-registered because it is from a different root namespace.

my code:

<?php

namespace AppBundle\Controller;

use Symfony\Component\HttpFoundation\Request;

class DetectServiceDetailController
{
    public $request;

    public function __construct(Request $request)
    {
        $this->request = $request;
        $serviceType = $this->request->query->get('type');
        return $serviceType;

    }

}

Anyway you should inject the RequestStack class instead of Request. — gp_sflover
– gp_sflover, Commented Mar 10, 2018 at 13:42
@sina read How to Retrieve the Request from the Service Container and API Reference — gp_sflover
– gp_sflover, Commented Mar 10, 2018 at 13:53
@gp_sflover Don't get offended :) Yes, best practice is to inject only what you need and even better when you need it, that's why in our team we inject Request right into controller methods. — Kevin Kopf
– Kevin Kopf, Commented Mar 10, 2018 at 14:13

Strabek · Accepted Answer · 2018-10-04 09:34:40Z

As per gp_sflover's suggestion here is a piece of code I use in Symfony 3.4:

<?php

namespace AppBundle\Controller;

use Symfony\Bundle\FrameworkBundle\Controller\Controller;
use Symfony\Component\HttpFoundation\RequestStack;

class BaseController extends Controller
{
    protected $request;

    /**
     * @param Symfony\Bundle\FrameworkBundle\Controller\Controller
     */
    public function __construct(RequestStack $requestStack)
    {
        $this->request = $requestStack->getCurrentRequest();
    }

    ...

In my case BaseController extends Controller so I don't need to update services.yml, but if this is stand alone service then you need to add it to services.yml e.g.

services:
    ...
    service_name:
        class: AppBundle\Service\ServiceName
        arguments:
            - '@request_stack'
        public: true

Just adding it for less experienced devs ;-)

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