Hello,
I have the exact need, as author of this question:
http://stackoverflow.com/questions/454436/unique-fields-that-allow-nulls-in-django.
I want a value to be unique, if it is not NULL. Database backend
allows such construction, but in Django admin I have got this error
message when saving form: Business unit with this VAT id already
exists.
As I see it, Django admin is storing empty string (''), and not NULL,
as documented here:
http://docs.djangoproject.com/en/dev/ref/models/fields/#null,
and that is the root cause - empty string is not NULL.
----
As I found later, this problem is (or was?) discussed also here:
http://code.djangoproject.com/ticket/4136.
Is there any progress in that area? (Some best practise howto...)
Thanks in advance, any advice is welcome.
Jano
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