C
subresourceOperations={
* "api_rooms_room_messages_get_subresource"={
* "method"="GET",
* "path"="/frontend/rooms/{id}/room_messages",
* },
* },/room_messages",
* },
* },
а в
php bin/console debug:router
api_rooms_room_messages_get_subresource GET ANY ANY /rooms/{id}/room_messages.{_format}
/frontend/rooms
или просто /rooms
?