flask-login: can't understand how it works

Question

I\'m trying to understand how Flask-Login works.

I see in their documentation that they use a pre-populated list of users. I want to play with a database-stored user

Answer 1

As per from the Flask-Login's document a user object must be returned and if the user id is not found it should return None instead of Exception.

@login_manager.user_loader
def load_user(userid):
    try:
        #: Flask Peewee used here to return the user object
        return User.get(User.id==userid)
    except User.DoesNotExist:
        return None