Symfony create new service as a new instance

Question

I have a service defined with several dependency injections in the constructor. At some point I want to get the service as a new instance instead of the same instance already created. Note that normally I want the service to be shared, but on an edge case I want to create a new instance, so the shared option in the service definition is not aplicable.

I can create a new object, but I then I would have to inject the dependencies manually, and I would prefer to let symfony to deal with it.

So how can I tell Symfony to return a service as a new instance?

Thank you.

Answer 1

As far as I know, there is no way to tell the Symfony Dependency Injection Container to return some times the shared instance, and other times a new instance of a service.

By default, the services are shared, as you already found out. You can tell the container to create a not-shared service by setting the shared setting to false in your service definition:

# app/config/services.yml
services:
    AppBundle\SomeNonSharedService:
        shared: false

Armed with this knowledge, I think the solution for your issue is to create a duplicate of the shared service with a different name and mark it as not-shared as explained above. When you ask the container to get the duplicate, it will create a new instance every time.

Do not attempt to create the duplicate as an alias of the original service, it doesn't work. The first thing the implementation of Contaner::get() does is to search for the service ID provided as argument into the list of aliases and use the ID of the original service instead if it finds it there.