For the record, here's what works:
In views.py:
if country == 'Canada':
delivery_time__lte=time_avail_hours
abbrev__contains='SC'
formShip = ShippingMethodForm(delivery_time__lte, abbrev__contains)
Then in models.py:
class ShippingMethodForm(forms.Form):
# tricky thing done here to change queryset based on ticket date
and destination
ship_method = forms.ModelChoiceField
(queryset=ShippingMethod.objects.none())
def __init__(self, delivery_time__lte, abbrev__contains, *args,
**kwargs):
super(ShippingMethodForm, self).__init__(*args, **kwargs)
self.fields["ship_method"].queryset =
ShippingMethod.objects.filter(
delivery_time__lte=delivery_time__lte,
abbrev__contains=abbrev__contains
)
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