Using DI with Symfony Controller

Question

I'm looking for a concrete example of implementing DI with Symfony controllers... https://symfony.com/doc/3.4/controller/service.html hasn't been much help.

Config

search_service:
    class:        Acme\MyBundle\Services\SearchService

search_controller:
    class:        Acme\MyBundle\Controller\SearchController
    arguments:    ['@search_service']

Controller

// Acme/MyBundle/Controllers/SearchController.php

class SearchController extends Controller
{
    public function __construct(SearchService $searchService)
    {
        $this->searchService = $searchService;
    }
}

Gives me:

Type error: Argument 1 passed to Acme\\MyBundle\\Controller\\SearchController::__construct() must be an instance of Acme\\MyBundle\\Services\\SearchService, none given

Any help appreciated :)

revengeance · Accepted Answer · 2018-11-07 11:13:22Z

1

Your controller does not work, because you don't have a namespace. So at the start, add correct namespace, but it will still be problematic to inject parameters with manual wiring, because you extend base controller.

Better just use autowiring, with that you won't need to define your dependencies from services.yml and it will work with controllers easily.

Here's example

  # app/config/services.yml
services:
    # default configuration for services in *this* file
    _defaults:
        # automatically injects dependencies in your services
        autowire: true
        # automatically registers your services as commands, event subscribers, etc.
        autoconfigure: true
        # this means you cannot fetch services directly from the container via $container->get()
        # if you need to do this, you can override this setting on individual services
        public: false

    # makes classes in src/AppBundle available to be used as services
    # this creates a service per class whose id is the fully-qualified class name
    AppBundle\:
        resource: '../../src/AppBundle/*'
        # you can exclude directories or files
        # but if a service is unused, it's removed anyway
        exclude: '../../src/AppBundle/{Entity,Repository}'

    # controllers are imported separately to make sure they're public
    # and have a tag that allows actions to type-hint services
    AppBundle\Controller\:
        resource: '../../src/AppBundle/Controller'
        tags: ['controller.service_arguments']

ps. Also, I recommend to don't extend base controller at all, because in that way you get too much dependencies you actually don't need. Better to get twig, services and everything you need by wiring them.

edited Nov 7, 2018 at 11:13

answered Nov 7, 2018 at 11:02

revengeance

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5 Comments

cloakedninjas Over a year ago

Tried this, but seem to be having issues resolving paths... ../src/Controller where's the namespace and bundle in that path?

revengeance Over a year ago

@cloakedninjas Updated code for version below 4, try now, but i'm not sure why you have this "Acme prefix" before :D, is that demo app ? Do you have dir structure like /src/AppBundle ? Please add autoload section of composer.json

cloakedninjas Over a year ago

It's not Acme - but the name of our company, we have several namespaces in our repo Company1\CoolBundle, Company2\AwesomeBundle

cloakedninjas Over a year ago

However - it's still unable to find these paths

The file "../../src/MyBundle/Controller" does not exist (in: /srv/www/src/Acme/MyBundle/DependencyInjection/../Resources/config).

revengeance Over a year ago

@cloakedninjas It will work, when you add cottect bundle name

cloakedninjas · Accepted Answer · 2018-11-07 13:18:16Z

0

I had to make the follow changes to get it working for my 3.4 installation:

Change resource relative path

Acme\MyBundle\Controller\:
    resource: '../../Controller'
    tags: ['controller.service_arguments']

Change 'name' of the controller to the full classname

Acme\MyBundle\Controller\SearchController:
    class:        Acme\MyBundle\Controller\SearchController
    arguments:    ['@search_service']

answered Nov 7, 2018 at 13:18

cloakedninjas

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