Here is an idea of what your forms.py should contain:
class AgencyForm(ModelForm):
class Meta:
model = Agency
def __init__(self, *args, **kwargs):
super(AgencyForm, self).__init__(*args, **kwargs)
if self.instance.id:
if self.instance.state_id:
counties =
County.objects.filter(state=self.instance.state_id)
county_field = self.fields['counties'].widget
county_choices = []
county_choices.append(('', '------'))
for county in counties:
county_choices.append((county.id, county.name))
county_field.choices = county_choices
Then in admin.py, make sure you have:
class AgencyAdmin(admin.ModelAdmin):
form = AgencyForm
Hope this helps,
Walt
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