On Wed, Mar 11, 2009 at 11:50 AM, Alex Jillard <mez...@gmail.com> wrote:
> If I override get_form in ShelfAdmin, I still get the same errors.
> self.fields is still None...any idea how to get access to the fields?
>
> On Wed, Mar 11, 2009 at 12:26 PM, Alex Gaynor <alex.gay...@gmail.com>wrote:
>
>>
>>
>> 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
>>
>>
>>
>
> >
>
It's not self.fields you want to assign to, it's the Form class the you get
from calling the super(and it will actually be base_fields here since you're
dealing with a Form class instead of an instance).
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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