On Wed, Mar 11, 2009 at 11:18 AM, Alex Jillard <mez...@gmail.com> wrote:
> Sorry Alex, I should have been more clear, I need to access the fields of
> another model. I went ahead and did what you said to try and get it
> working, and I was able to get the fields from the form's model, but I get
> an error when trying to assign them to the choices property of my field.
>
> The following code gives the following error:
>
> class ShelfAdmin(admin.ModelAdmin):
> sort_by = forms.ChoiceField(choices = ())
>
> def __init__(self, *args, **kwargs):
> super(ShelfAdmin, self).__init__(*args, **kwargs)
>
> sort_by_choices = [('', '-------')]
>
> for field in self.model._meta.fields:
> sort_by_choices.append((field.name,
> field.verbose_name.title()))
>
> self.fields['sort_by'].choices = sort_by_choices
>
> admin.site.register(Shelf, ShelfAdmin)
> TypeError at /admin/shelf/shelf/add/
>
> 'NoneType' object is unsubscriptable
>
>
> Which I guess means that self.fields is None. Any idea why this might be
> happening?
>
> On Wed, Mar 11, 2009 at 11:35 AM, Alex Gaynor <alex.gay...@gmail.com>wrote:
>
>>
>>
>> On Wed, Mar 11, 2009 at 10:33 AM, Alex Jillard <mez...@gmail.com> wrote:
>>
>>> I'm trying to populate an admin form with the field names of of a model
>>> class, but I don't want to have to instantiate that model just to read it's
>>> fields from _meta.
>>>
>>> I basically want to do something like this:
>>>
>>> self.fields['sort_by'].choices = [(field.verbose_name, field.name) for
>>> field in field_list]
>>>
>>> field_list would be the equivalent to model_instance._meta.fields, but
>>> without requiring the model instance.
>>>
>>> I know I could just grab an instance of the model from the database, but
>>> I'd like this to work even if there are no instances currently saved.
>>>
>>>
>>>
>> _meta exists on the class as well, so on a ModelAdmin you can do
>> self.model._meta.fields
>>
>> Alex
>>
>> --
>> "I disapprove of what you say, but I will defend to the death your right
>> to say it." --Voltaire
>> "The people's good is the highest law."--Cicero
>>
>>
>>
>
> >
>
This occurs because self.fields isn't a dictionary of the field objects like
it is on a ModelForm, you probably want to do all of this in the get_form()
method.
Alex
--
"I disapprove of what you say, but I will defend to the death your right to
say it." --Voltaire
"The people's good is the highest law."--Cicero
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