Django Registration without username

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class RegistrationFormNoUserName(RegistrationFormUniqueEmail):
    """
    A registration form that only requires the user to enter their e-mail 
    address and password. The username is automatically generated
    This class requires django-registration to extend the 
    RegistrationFormUniqueEmail
    """ 
    username = forms.CharField(widget=forms.HiddenInput, required=False)

    def clean_username(self):
        "This function is required to overwrite an inherited username clean"
        return self.cleaned_data['username']

    def clean(self):
        if not self.errors:
            self.cleaned_data['username'] = '%s%s' % (self.cleaned_data['email'].split('@',1)[0], User.objects.count())
        super(RegistrationFormNoUserName, self).clean()
        return self.cleaned_data

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Comments

gwrtheyrn (on September 6, 2011):

I updated the username generation a little... Didn't really like the solution with the total user count.

if not self.errors:
    localpart = self.cleaned_data['email'].split('@',1)[0][:25]
    c = User.objects.filter(username=localpart).count()
    if c > 1:
        localpart += c
    self.cleaned_data['username'] = localpart

#

gwrtheyrn (on September 12, 2011):

Actually the code in my last comment was buggy. Working version:

if not self.errors:
    localpart = self.cleaned_data['email'].split('@',1)[0][:25]
    c = User.objects.filter(username=localpart).count()
    if c > 0:
        localpart += str(c + 1)
    self.cleaned_data['username'] = localpart

#

dsaracini (on June 13, 2012):

The solution above will only work the first time a duplicate is found. For example, if joe@yahoo.com registers, his username will be "joe". If joe@gmail.com tries to register, it will find "joe" and will get a count of 1 and username will be "joe2". However, if joe@hotmail.com tries to register, the local part will be "joe". It will still get a count of 1 and it will try to set username to joe2 and your application will get an error. This is because filter is "username=joe" (thus, not finding "joe2"). A better solution, and one that will prevent this error is:

c = User.objects.filter(username__startswith=localpart).count()

#

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