Well, you're probably getting the error on your 'extra' inlines.
self.instance is unbound in that case, and so self.instance.providers
cannot be looked up.
I wrote a little thing to fetch a proper object though... just be sure
to include your parent model's field in your fields on the inline.
Then you can use this generic utility function... you can pick pieces
out of it if you think it wiser. I just took the sledgehammer to the
wall to get my task accomplished:
def implied_inline_fk(form, implied_model_class, field_name=None):
if not field_name:
field_name = implied_model_class.__name__.lower()
try:
return implied_model_class.objects.get(pk=tuple(i[0] for i in
form.fields[field_name].widget.choices)[1])
except IndexError:
# In the event that both the base 'original' object and inline
object don't exist,
# we need to just throw out the possibility of filtering values.
return None
except KeyError:
raise KeyError("'%s' must be included in the inline ModelAdmin's
'fields' attribute." % field_name)
You could then use this in your PartnerForm:
class PartnerForm(forms.ModelForm):
def __init__(self, *args, **kwargs):
super(PartnerForm, self).__init__(*args, **kwargs)
if 'instance' in kwargs:
# Existing instance-- safe to use
self.fields['default_provider'].queryset =
self.instance.providers
else:
# 'extra' unbound object. Not safe.
# Must derive through some other means.
parentInstance = implied_inline_fk(self, PARENTMODEL,
'field_name_to_parent_model')
self.fields['default_provider'].queryset =
parentInstance.somelookup_to_provider_filter
Note that sometimes this doesn't really work, depending on your model
hierarchy. You might have to throw in the towel on 'extra' inlines.
The key is to filter only when it's bound, and to work around the
filter if it's not bound.
Tim
On Dec 16, 11:10 am, Eric Chamberlain <e...@rf.com> wrote:
> I'd like PartnerRegistration's default_provider field to be filtered in
> PartnerRegistrationInline, like how Partner's default_provider field is
> filtered in PartnerAdmin.
>
> When I try the code below, I get a DoesNotExist exception in:
>
> self.fields['default_provider'].queryset =
> self.instance.partner.providers
>
> raise self.field.rel.to.DoesNotExist
>
> What am I doing wrong?
>
> class Partner(Model):
> id = UUIDField(primary_key=True)
> providers = ManyToManyField('Provider', related_name='provider_partners',
> blank=True, null=True)
> default_provider = ForeignKey('Provider', null=True, blank=True,
> help_text='The calling service used to make calls through by default when
> using this partner')
>
> class PartnerForm(forms.ModelForm):
> """ Filter and only show what belongs to this partner."""
>
> def __init__(self, *args, **kwargs):
> super(PartnerForm, self).__init__(*args,**kwargs)
> self.fields['default_provider'].queryset = self.instance.providers
>
> class PartnerRegistration(Model):
> id = UUIDField(primary_key=True)
> partner = ForeignKey('Partner',unique=True)
> default_provider = ForeignKey('Provider',verbose_name='default calling
> service', help_text='User this calling service when response doesn\'t specify
> one.')
>
> class PartnerRegistrationForm(forms.ModelForm):
> """ Filter and only show what belongs to this partner."""
>
> def __init__(self, *args, **kwargs):
> super(PartnerRegistrationForm, self).__init__(*args,**kwargs)
> self.fields['default_provider'].queryset =
> self.instance.partner.providers
>
> class PartnerRegistrationInline(StackedInline):
> model = PartnerRegistration
> form = PartnerRegistrationForm
>
> class PartnerAdmin(ModelAdmin):
> form = PartnerForm
>
> inlines = [ PartnerRegistrationInline, ]
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