On Sep 23, 4:44 pm, BobZ <[EMAIL PROTECTED]> wrote:
> Thanks Daniel. I've found solutions similar to yours in other threads
> on the net, and everytime I test them, I literally get no form at all
> in my rendered template.
> My template appears to have all the correct code in it as you can see
> in the link "search.html" at the bottom of this post.
> Looking at the code you provided, it seems like the
> "queryset=Vehicle.objects.order_by('-year').distinct()" pulls all
> distinct fields from the Vehicle table and sorts them by year. What
> I'm actually after is a way to filter out only the years and list them
> in descending order.
>
> In my forms.py file, I've kept all variations of the code I've tested
> for this app commented out for my own reference, but maybe it will
> help you see what's happening and what I'm trying to do.
>
> Here's all of my code in dpaste:
> <a href="http://dpaste.com/80010/";>models.py -http://dpaste.com/80010/</a>
> <a href="http://dpaste.com/80009/";>forms.py -http://dpaste.com/80009/</a>
> <a href="http://dpaste.com/80011/";>views.py -http://dpaste.com/80011/</a>
> <a href="http://dpaste.com/80013/";>search.html -http://dpaste.com/80013/</a>
I think you're misunderstanding the point of ModelForms.
A ModelForm (as opposed to a standard form) is specifically for
creating or editing a model instance. So if you had a model with a
foreignkey to Vehicle, you could use this model as the base for a
modelform with the modelchoice field we have defined.
However, you have defined a ModelForm based on the Vehicle model, with
a modelchoice field also pointing at Vehicle. That doesn't make sense,
as the year field on Vehicle isn't a ForeignKey, it's an IntegerField.
This could be why you're not getting any output in the rendered
template.
Luckily, your use case doesn't warrant a ModelForm anyway. You're not
editing a model, you are using the form to create a search box. So you
just want a standard Form. In which case, something akin to dmorozov's
solution may be best after all. How about this:
class SearchForm(forms.Form):
year=forms.ChoiceField()
def __init__(self, *args, **kwargs):
super(SearchForm, self) .__init__(*args, **kwargs)
self.fields['year'].choices =
Vehicle.objects.values_list('year', 'year').distinct().order_by('-
year')
--
DR.
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