> On Fri, Mar 2, 2012 at 2:18 PM, Mauro Sánchez <mauroka@gmail.com> wrote:
>> El día 29 de febrero de 2012 19:04, Marc Aymerich
>> <glicerinu@gmail.com> escribió:
>>> On Wed, Feb 29, 2012 at 10:55 PM, Marc Aymerich <glicerinu@gmail.com> wrote:
>>>> On Wed, Feb 29, 2012 at 8:22 PM, Mauro Sánchez <mauroka@gmail.com> wrote:
>>>>> Hello, if I have the following Model:
>>>>>
>>>>> class A:
>>>>> name
>>>>>
>>>>> class B:
>>>>> name
>>>>> a = models.ForeignKey(A)
>>>>>
>>>>> class C:
>>>>> name
>>>>> b = models.ForeignKey(B)
>>>>>
>>>>> And let's suppose that in the Admin Site I have a Filter in the C list
>>>>> that refers to the A model. Is there a way to keep that filter when I
>>>>> am going to add a new C object and use it to filter the combobox of
>>>>> the b filed so that it will only show the b objects that are related
>>>>> to the A model in the filter?
>>>>> For example:
>>>>> If the filter I choose points to the id=1 in the A model, the combobox
>>>>> for the b field when I add a C object only has to show the B objects
>>>>> that has a = 1
>>>>>
>>>>
>>>> If I understand you righ, it's a bit triky stuff, you have to do two things:
>>>> 1) Define a custom add_form and override their __init__ method with
>>>> something like:
>>>> self.fields['b'].queryset = self.fields['b'].queryset.filter(a=a_pk)
>>>> 2) Provides the current value of your filter (a_pk) to the defined form on 1)
>>>> I think this can be done overriding modeladmin.get_form() method
>>>> since request is one of their args, so you can extract the value of
>>>> the filter on the http referer url and provide it to the form that
>>>> this method creates.
>>>>
>>>
>>> More specifically:
>>>
>>> def get_form(self, request, *args **kwargs):
>>> form = super(YourModelAdmin, self).get_form(request, *args, **kwargs)
>>> a_pk = get_a_pk_from_http_referer(request)
>>> form.a_pk = a_pk
>>> return form
>>>
>>> def __init__(self, *args, **kwargs):
>>> super(YourModelForm, self).__init__(*args, **kwargs)
>>> self.fields['b'].queryset = self.fields['b'].queryset.filter(a=self.a_pk)
>>>
>>
>> Hello Marc,
>> the filter in the __init__ method works fine. I know this because I
>> have set a value manually.
>> But I have a problem when I try to pass the value self.a_pk to the
>> filter in the queryset defined in the __init__ method. This is the
>> error I get:
>>
>> 'CForm' object has no attribute 'a_pk'
>>
>> It's like the form never received this new variable. What can be the
>> problem here?
>>
>
> Mmm I never overrided get_form before, so I can not tell for sure what
> is wrong. But something you can try with more chances of success is:
>
> def get_form(self, request, *args **kwargs):
> self.form.a_pk = get_a_pk_from_http_referer(request)
> return super(YourModelAdmin, self).get_form(request, *args, **kwargs)
>
> Or maybe... are you working with inlines? if it is the case, you must
> override get_formset of the inline class.
>
Hello Marc, I has just realized that I was placing the get_form
definition in the wrong place. The correct place to place it is in the
CAdmin redefinition.
The code you paste in the first place works great.
Thanks a lot for the help.
Greetings.
Mauro.
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