basic unique ModelForm field for Google App Engine
- by Alexander Vasiljev
I do not care about concurrency issues.
It is relatively easy to build unique form field:
from django import forms
class UniqueUserEmailField(forms.CharField):
def clean(self, value):
self.check_uniqueness(super(UniqueUserEmailField, self).clean(value))
def check_uniqueness(self, value):
same_user = users.User.all().filter('email', value).get()
if same_user:
raise forms.ValidationError('%s already_registered' % value)
so one could add users on-the-fly. Editing existing user is tricky. This field would not allow to save user having other user email. At the same time it would not allow to save a user with the same email. What code do you use to put a field with uniqueness check into ModelForm?
