username field in django sign up form

Question

I use from django.contrib.auth.forms import UserCreationForm in forms.py for creating sign up form. first I register with a username, for example ali and again when I try to register with Ali it allows me to create user. how can I prevent registering with two same username like Ali and ali ?

score 0 · Answer 1 · answered Feb 08 '18 at 10:09

0

What I would do is override the UserCreationForm, and write a custom validation to check if that username__iexact already exists, and if so, raise a validation error

answered Feb 08 '18 at 10:09

Dalvtor

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I tried this but doesn't work: ` def clean_username(self, username): username = self.cleaned_data['username'] if User.objects.get(username__iexact=self.cleaned_data['username']): raise forms.ValidationError("This username has already existed.") return username` – Ali Soltani Feb 08 '18 at 10:48

score 0 · Accepted Answer · answered Feb 08 '18 at 11:22

This worked for me:

def clean_username(self):
    username = self.cleaned_data['username']
    username1=str(username)
    username1=username.lower()
    if User.objects.filter(username=username1).exists():
        self._errors["username"] = ErrorList([u"username exists"])

username field in django sign up form

2 Answers2