Flask-Login raises TypeError: 'int' object is not callable

Question

I just write a flask login demo.

@app.route('/reg/', methods=['GET', 'POST'])
def reg():
    username = request.form.get('username').strip()
    password = request.form.get('password').strip()
    if (username == '' or password == ''):
        return redirect_with_msg('/regloginpage/', u'用户名或密码不能为空', category='reglogin')

    user = User.query.filter_by(username=username).first()
    if (user != None):
        return redirect_with_msg('/regloginpage/', u'用户名已存在', category='reglogin')

    salt = '.'.join(random.sample('0123456789abcdfeghijklmnABCDEFG', 10))
    m = hashlib.md5()
    str1 = (password + salt).encode('utf-8')
    m.update(str1)
    password = m.hexdigest()
    user = User(username, password, salt)
    db.session.add(user)
    db.session.commit()
    login_user(user)
    return redirect('/')

And Traceback like this:

TypeError: 'int' object is not callable
File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/flask/app.py", line 1598, in dispatch_request
return self.view_functions[rule.endpoint](**req.view_args)
File "/Users/apple/PycharmProjects/pinstagram/pinstagram/views.py", line 94, in login
login_user(user)
File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/flask_login/utils.py", line 140, in login_user
user_id = getattr(user, current_app.login_manager.id_attribute)()
TypeError: 'int' object is not callable

It makes me upset, someone can save me ?

Answer 1

Reading the error message shows that the error is occurring on line 140 of utils.py. This is probably because you have

user_id = getattr(user, current_app.login_manager.id_attribute)()

The () on the end is making your program try to call the return value of getattr as a function, when it is an int. Remove the () and it should work.