Logic error in the db-api documentation

[David Paccoud <dpaccoud@…>]

in ​http://www.djangoproject.com/documentation/db-api/#exclude-kwargs

This example excludes all entries whose pub_date is later than 2005-1-3 AND whose headline is NOT “Hello”
should read:
This example excludes all entries whose pub_date is later than 2005-1-3 OR whose headline is NOT “Hello”

That is because "select not x and not y" is equivalent to "select not (x or y)" and, therefore, "exclude x or y"

[ramiro]

David is talking about the

Entry.objects.exclude(pub_date__gt=datetime.date(2005, 1, 3)).exclude(headline='Hello')

example. But the sentence he suggests is also wrong, after applying the ​De Morgan's law as he rightly suggests it should read:

"This example excludes all entries whose pub_date is later than 2005-1-3 OR whose headline is “Hello”"

[David Paccoud <dpaccoud@…>]

Updated version

[David Paccoud <dpaccoud@…>]

Thanks ramiro, you are absolutely right.
I have updated the patch.

[adrian]

(In [6126]) Fixed #5409 -- Fixed logic error in docs/db-api.txt. Thanks, David Paccoud