def validate(self):
if request.form["user_name"] is None or request.form["user_name"].strip()=="":
return False
inserted_username = request.form["user_name"]
user = Users.query.filter_by(user_name = inserted_username).first()
if user != None:
suggested_username = Users.create_unique_username(inserted_username)
flash('This username already exists. Consider register with %s' % suggested_username)
return False
return True
