Eli Hood Eli Hood - 9 months ago 32
Python Question

'NoneType' object has no attribute 'username'?

so i got this error

AttributeError: 'NoneType' object has no attribute 'username'

any suggestions,


class User(db.Model):
__tablename__ = "users"
id = db.Column(db.Integer, primary_key=True)
username = db.Column(db.String(80), unique=True)
password = db.Column(db.String(20), unique=True)

def __init__(self, username, password):
self.username = username
self.password= bcrypt.generate_password_hash(password, 10)

def is_authenticated(self):
return True

def is_active(self):
return True

def is_anonymous(self):
return False

def get_id(self):
return (self.id)

def __repr__(self):
return '<User %r>' % self.username


@app.route('/register', methods=['GET','POST'])
def register():
if request.method == 'GET':
return render_template('register.html')
user = User(request.form['username'] , request.form['password'] )
username = request.form['username']
password = request.form['password']
storeduser = User.query.filter_by(username=username).first()
if storeduser.username is not None and storeduser.username == request.form['username']:
return 'User already Exist !'
flash('User successfully registered')
return redirect(url_for('index'))

Pretty much if client username matches a current username output
Existing user registered, if not register username.

im referring to my username in my models(in case you were wondering)

Answer Source

The User.query.filter_by(username=username).first() query returned None, meaning the user was not found.

You need to test if storeduser is not None first, not storeduser.username:

if storeduser is not None and storeduser.username == request.form['username']:
    return 'User already Exist !'

Because you queried on request.form['username'] the latter test is redundant, you only really need to use;

if storeduser is not None:
    return 'User already Exist !'