I have this fields in form:
city = forms.ModelChoiceField(label=\"city\", queryset=MyCity.objects.all())
district = forms.ModelChoiceField(label=\"district\", qu
@radtek's comment should be an answer as it is useful in similar scenarios but with different approach than the accepted answer.
If your queryset changes with the url in your view.
I am extending the answer with example as I used:
def my_view(request):
...
form = YourForm(initial={'field1':value1, 'field2':value2})
form.fields['field3'].queryset = YourModel.objects.filter('foo'=bar)