Flask SQLAlchemy reverse inclusion a many to many query - flask

Question

I'm quite new to SQLAlchemy.
For this project I'm using flask and sqlalchemy.
One of the routes I need is to make is to add users to a certain group. So I need to create a list of users which are not included in this group.
I made an SQL statement and tried it in my database, which gives me the result I need, I'm just not good at converting this into SQLAlchemy
select id, email from users where id not in ( select user_id from user_group where group_id = 1);
my models look like this
UserGroup = db.Table(
"user_group",
db.Model.metadata,
db.Column("user_id", db.Integer, db.ForeignKey("users.id")),
db.Column("group_id", db.Integer, db.ForeignKey("groups.id")),
)
class Group(db.Model, RestrictionsMixin):
__tablename__ = "groups"
__versioned__ = {}
__restrictions__ = {}
id = db.Column(db.Integer, primary_key=True)
name = db.Column(db.String(255), nullable=False, unique=True)
class User(db.Model):
__tablename__ = "users"
__versioned__ = {}
id = db.Column(db.Integer, primary_key=True)
email = db.Column(db.String(250), unique=True, nullable=False)
_password = db.Column(db.LargeBinary(60), nullable=False)
authenticated = db.Column(db.Boolean, default=False)
active = db.Column(db.Boolean, default=True, nullable=False)
email_confirmation_sent_on = db.Column(db.DateTime, nullable=True)
email_confirmed = db.Column(db.Boolean, nullable=True, default=False)
email_confirmed_on = db.Column(db.DateTime, nullable=True)
registered_on = db.Column(db.DateTime, nullable=True)
last_logged_in = db.Column(db.DateTime, nullable=True)
groups = db.relationship("Group", secondary="user_group", backref="users")

Answer 1

You could do something like this:
user_group_subquery = (
db.session.query(UserGroup.c.user_id).filter(UserGroup.c.group_id == 1).subquery()
)
db.session.query(User.id, User.email).filter(~User.id.in_(user_group_subquery))
The tilde (~) returns the negation of a clause.