Select many to many using function count() - flask

Question

I have many to many relationships and i try to find User which has a minimum requests im my subs table but i can't understand how i can do it.
Could you please clarify how i can do it
my Models are:
subs = db.Table('subs',
db.Column('user_id', db.Integer, db.ForeignKey('user.id')),
db.Column('request_id', db.Integer, db.ForeignKey('request.id'))
)
class User(UserMixin, db.Model):
id = db.Column(db.Integer, primary_key=True)
name = db.Column(db.String(120))
role = db.Column(db.String(120))
password_hash = db.Column(db.String(120))
requests = db.relationship('Request', secondary=subs,
backref=db.backref('users', lazy='dynamic'))
post = db.relationship('Posts', backref = 'user', lazy = 'dynamic')
request = db.relationship('Request', backref='user', lazy = 'dynamic')
is_active = db.Column(db.String(120))
class Request(db.Model):
__tablename__ = 'request'
id = db.Column(db.Integer, primary_key=True)
org = db.Column(db.String(120))
user_id = db.Column(db.Integer, db.ForeignKey('user.id'))
cost = db.Column(db.Integer)
created = db.Column(db.DateTime, default= datetime.utcnow)
cost_time = db.Column(db.Integer)
update_time = db.Column(db.DateTime, default = datetime.utcnow())
diff_time = db.Column(db.DateTime)
feedback = db.Column(db.Text, default=update_time)
comment = db.relationship('Posts', backref = 'request', lazy='dynamic')
rate_idea = db.Column(db.Integer)
new = db.Column(db.Text)
cost_buyer = db.relationship('Costs', backref = 'request', lazy='dynamic')
status = db.Column(db.String(120), db.ForeignKey('status.id'))
For example:
User1.requests = [Request_1, 'Request_2, Request_3]
User2.requests = [Request_2, Request_3]
When somebody do a new Request i need to clarify firstly which user has a minimum requests from all of users and then put this request to him.
New_request = Request(org = 'TEST')
In this case User2 must add this New_request to his own User.requests so the final result must be
User1.requests = [Request_1, 'Request_2, Request_3]
User2.requests = [Request_2, Request_3, New_request]
i want to do query something like this, but what is the right and simple solution for this i don't know and i want to know:
db.query.filter(min(len(User.requests))

Answer 1

Something like this should work. But I suggest you to check the docs.
from sqlalchemy import func
db.query(User.id, func.count())
.outerjoin(User.requests)
.group_by(User.id)
.order_by(func.count())
.limit(1)