How to filter exact many to many

Question

I have User and Room model in Flask SQLAlchemy. I need to filter if Room exists with users [user1, user2, ...]. Filter must be exact.
Here are my models:

Answer 1

After two days of research I have a temporary solution.

-- room_users is the "secondary" table in 
   -- sqlalchemy many to many between User and Room
select room.name, room_users.room 
    from room_users join room on room_users.room = room.id 
    where room_users.user in (1,2) 
    group by room_users.room having count(*) = 2;

In python it will be something like this:

# members contains user emails
members = ['email1@mail.com', 'email2@mail.com']
db.session.query(Room.name).join(Room.users).filter(
    User.email.in_(members)
).group_by(Room.id).having(
    func.count(Room.id) == len(members)
).first()