El día 2 de marzo de 2012 11:06, Marc Aymerich <glicer...@gmail.com> escribió: > On Fri, Mar 2, 2012 at 2:18 PM, Mauro Sánchez <maur...@gmail.com> wrote: >> El día 29 de febrero de 2012 19:04, Marc Aymerich >> <glicer...@gmail.com> escribió: >>> On Wed, Feb 29, 2012 at 10:55 PM, Marc Aymerich <glicer...@gmail.com> wrote: >>>> On Wed, Feb 29, 2012 at 8:22 PM, Mauro Sánchez <maur...@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. -- You received this message because you are subscribed to the Google Groups "Django users" group. To post to this group, send email to django-users@googlegroups.com. To unsubscribe from this group, send email to django-users+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/django-users?hl=en.
