>> Thanks, Evert! I could check now that the table is correct - and,
>> with
>> some experimenting, I found the mistake I had made too: I had, in
>> models.py, in class Admin, entered "ordering = ('nummer')" instead of
>> "ordering = ['nummer']".
>>
>> Perhaps somebody can explain why list_display and list_filter require
>> a tuple, and ordering and search_fields require a list?
>
> I don't know the options all by heart, but I'm guessing any iterable
> will work.
> However, ('nummer') is not a tuple, it's a string (surrounded by
> parenthesis).
> ('nummer',) , with the *extra* comma, is a single-element tuple, and
> very likely will work (as well as ['nummer'] will).
> Easy (and probably common) mistake to make though.
And for the full record, I should add, that the admin/django/python
was actually taking the first element of the iterable you used for
ordering; of the string, that is: 'nummer'[0] is indeed 'n', which
confirms the error you got.
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