models.py 文件源码

def validate_email(self):
        """Ensure emails are unique across the models tracking emails.

        Since it's essential to keep email addresses unique to support our
        workflows, a `ValidationError` will be raised if the email trying
        to be saved is already assigned to some other user.
        """
        lookup = Q(email__iexact=self.email)
        if self.pk is not None:
            # When there's an update, ensure no one else has this address
            lookup &= ~Q(user=self)

        try:
            EmailAddress.objects.get(lookup)
        except EmailAddress.DoesNotExist:
            pass
        else:
            raise ValidationError({
                'email': [_('This email address already exists.')]
            })