count the number of rows with a condition with SQLAlchemy

问题

I have a sqlite table like this. Which has 3 columns. I want to count the number of rows where user_id = 1 is this possible with SQLAlchemy?

class UserImage(db.Model):
        id = db.Column(db.Integer, primary_key=True)
        user_id = db.Column(db.Integer, db.ForeignKey('user.id'))
        photo = db.Column(db.String(250))

This will return all the rows. How to modify this to get my expected result. rows = db.session.query(func.count(UserImage.user_id)).scalar()

Thank you so much in advance.

回答1:

You can do it like this:

UserImage.query.filter(UserImage.user_id == 1).count()

or

db.session.query(UserImage).filter(UserImage.user_id == 1).count()

来源：https://stackoverflow.com/questions/25605410/count-the-number-of-rows-with-a-condition-with-sqlalchemy