Symfony 4 services ignored when declared inside a resource file

Question

Following the official documentation ( here ), I decided to split my services.yaml configuration file into several files for readability.

I then created a file config/services/doctrine_listeners.yaml containing this single service definition :

services:
    _defaults:
        autowire: true     
        autoconfigure: true

    App\Listeners\BookListener:
        tags:
            - { name: doctrine.event_listener, event: prePersist  }

And I import it like this in my config/services.yaml :

imports:
    - { resource: 'services/doctrine_listeners.yaml' }

When proceeding like that, the listener is never instanciated. If I instead declare it directly inside the config/services.yaml it works.

This looks like a bug to me, did I miss something ?

Answer 1

The problem might be that the service is overwritten by the default service file. In it there is a PSR-4 service discovery for all classes in src:

# makes classes in src/ available to be used as services
# this creates a service per class whose id is the fully-qualified class name
App\:
    resource: '../src/*'
    exclude: '../src/{DependencyInjection,Entity,Migrations,Tests,Kernel.php}'

This will also register your listeners and it looks like this will overwrite the previous configuration from inside your file.

I would recommend adding Listeners to the exclude section in services.yaml and then move service discovery for them to your file instead:

services:
    _defaults:
        autowire: true     
        autoconfigure: true

    App\Listeners\:
        resource: '../../src/Listeners/*'

    App\Listeners\BookListener:
        tags:
            - { name: doctrine.event_listener, event: prePersist  }

Answer 2

The most probable reason would be redundancy in adding your services, which doesn't allows to load the services. It would be great if you share you config/services.yml content here.