Symfony 2.8 : Doctrine getManagerForClass() not returning the right Entity Manager

Question

tl;dr How does the getManagerForClass() method find out which entity manager is the right one for a specific class?

I\'ve made a generic controller that

Answer 1

At long last, I solved it. The solution was using the prefix parameter.

entity_managers:
    postgres:
        connection: postgres
        mappings:
            AppBundle:
                type: annotation
                dir: Entity\Postgres
                prefix: AppBundle\Entity\Postgres
                alias: Postgres
    oracle:
        connection: oracle
        mappings:
            AppBundle:
                type: annotation
                dir: Entity\Oracle
                prefix: AppBundle\Entity\Oracle
                alias: Oracle

Explanation

The prefix parameter gets passed to the corresponding Entity Manager service, and is added to the entityNamespaces property, which otherwise defaults to AppBundle/Entity. The Annotation Driver will then check for annotations in that specific namespace, whereas the File Driver checks for existing mapping files in the directory specified through the dir parameter. (The alias parameter is not mandatory.)

At least, that's how I understand it.