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Ensure submitted slugs do not conflict with existing resolvable URLs

Author:
ElfSternberg
Posted:
June 26, 2009
Language:
Python
Version:
1.0
Tags:
registration slug reverse resolve
Score:
1 (after 1 ratings)

This code overrides the existing RegistrationForm in django-registration and adds a new validation step. In this step, the username (my example slug) is compared against all the existing URLs that the application currently resolves and, if it does successfully resolve, throws a validation exception. This indicates that the username chosen would be overriden (or, if you wrote your urls.py file badly, would override) an existing URL already recognized by your application.

A much longer explanation can be found at Dynamic names as first-level URL path objects in Django.

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# Somewhere in your application:

from registration.forms import RegistrationForm
from django.forms import ValidationError
from django.core.urlresolvers import resolve, Resolver404
from urlparse import urlparse

class NewRegistrationForm(RegistrationForm):

    # Ensures than any usernames added will not
    # conflict with existing commands.

 def clean_username(self):
        username = super(NewRegistrationForm, self).clean_username()
        try:    resolve(urlparse('/' + username + '/')[2])
        except Resolver404, e:
            return username

        raise ValidationError(
            (u'This username does not create '
             u'a valid URL.  Please choose '
             u'another'))


# in urls.py:

url(r'^accounts/register/$',
    'registration.views.register',
    { 'form_class': NewRegistrationForm },
    name = 'registration_register')

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