Custom operation route "Not Found" error

My API Resource:

namespace AppBundle\Entity;

use ApiPlatform\Core\Annotation\ApiResource;

/**
 * @ApiResource(
 *     collectionOperations={
 *        "list"={"route_name"="campaign_list"}
 *     }
 * )
 * @ORM\Entity
 */
class Campaign {
...
}

My custom action:

namespace AppBundle\Action;

use Sensio\Bundle\FrameworkExtraBundle\Configuration\Method;
use Symfony\Component\Routing\Annotation\Route;
use Symfony\Component\HttpFoundation\JsonResponse;
use AppBundle\Entity\Campaign;
class CampaignList
{
    /**
     * @Route(
     *     name="campaign_list",
     *     path="/list",
     *     defaults={
     *          "_api_resource_class"=Campaign::class,
     *          "_api_collection_operation_name"="list"
     *     },
     *
     * )
     * @Method("GET")
     */
    public function __invoke()
    {
       return new JsonResponse(['test'=>'test']);
    }
}

My routing:

api:
    resource: 'api'
    prefix: /api
    type:     'api_platform'

Then I try to send request, and got 404 error:

[mychalvlcek]

@mitalcoi yes, the route isn’t matched correctly because of itemOperation regex (regex is too open - matches everything).

quick solution: move “app” routing configuration before “api_platform” routing cfg so your custom routes will be matched before the generated (from api_platform) ones

app:
    resource: '@AppBundle/Action/'
    type: 'annotation'

api:
    resource: 'api'
    prefix: /api
    type: 'api_platform'

[mitalcoi]

I’ve just applied your PATCH to fresh instance of api-platform, and routes are rendered OK (only difference is that I used _api_collection_operation_name instead of _api_item_operation_name from your PATCH) until I try to send smth to this route: