After considering the severe disadvantage imposed by lacking a handling case for the 'add' view, I figured it out and wrote it up here, for the sake of more verbose documentation:
http://mangos.dontexist.net/blog/?p=345 Primarily, the idea is that for inlines, I can grab the hidden field providing the id of the primary parent field. Using that id I can traverse up to the parent, and then back down to filter options accordingly. For non-inline 'add' view cases, this is still an issue, but if you can fill out enough required fields, you can actually do something like the following: class MyInlineForm(forms.ModelForm): def __init__(self, *args, **kwargs): forms.ModelForm.__init__(self, *args, **kwargs) if 'instance' in kwargs: instance = kwargs['instance'] else: instance = MyParentModel.objects.get(pk=tuple(i[0] for i in form.fields['myparentmodel'].widget.choices)[1]) self.fields['othermodel'].queryset = OtherModel.objects.filter (parent=instance) Sorry if the abstraction to generic names is hard to read. Basically you get into the 'choices' on the hidden field (which are oddly still fully assembled, with u'--------' and all) and grab the only id in the list, using it to look up the proper model. You could forgo the actual model lookup, and just filter OtherModel by a lookup to the id only, but in complex cases like my own (I've only touched the surface with the Company-Contract-Location scenario) I need the model instance itself. Tim On Nov 5, 4:37 pm, Tim Valenta <tonightslasts...@gmail.com> wrote: > I don't know what changed, but updating my SVN in the last week > sometime has fixed the problem that I was having. > > The dev trunk and I have a love-hate relationship :) > > I would make a note to anybody reading this that if the 'add' view is > being used, you should kick off the code block with a "if 'instance' > in kwargs" > > Working code: > > # used in a direct subclass of ModelAdmin > class ContractForm(forms.ModelForm): > def __init__(self, *args, **kwargs): > forms.ModelForm.__init__(self, *args, **kwargs) > if 'instance' in kwargs: > contract = kwargs['instance'] > self.fields['locations'].queryset = > Location.objects.filter(company=contract.company) > > # used in a TabularInline of that same ModelAdmin's inlines > class EventInlineForm(forms.ModelForm): > def __init__(self, *args, **kwargs): > forms.ModelForm.__init__(self, *args, **kwargs) > if 'instance' in kwargs: > contract = kwargs['instance'] > self.fields['location'].queryset = > Location.objects.filter(company=contract.company) > > Thank you, God. I've been pulling my hair out over this. > > Tim --~--~---------~--~----~------------~-------~--~----~ 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 -~----------~----~----~----~------~----~------~--~---
