How to use multiple DB users?

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In my flask restless file, I have a read user and a write user. Each has their own db session.
This is basically what I'm trying to do at the moment:

manager = flask_restless.APIManager(app, session=read_session)

server = manager.create_api(Server, methods=["GET"])

admin_manager = flask_restless.APIManager(app, session=write_session)

server_admin = admin_manager.create_api(Server, collection_name='server_admin', methods=["GET","POST","PUT","PATCH","DELETE"])

but am getting an error that says:
"Flask-Restless has already been initialized on this application"

I also tried this and it doesn't seem to work either

manager = flask_restless.APIManager(app, session=read_session)

server = manager.create_api(Server, methods=["GET"])

manager.session = write_session

server_admin = manager.create_api(Server, collection_name='server_admin', methods=["GET","POST","PUT","PATCH","DELETE"])