Create empty queryset by default in django form fields

Question

I have this fields in form:

city = forms.ModelChoiceField(label="city", queryset=MyCity.objects.all())
district = forms.ModelChoiceField(label="district", queryset=MyDistrict.objects.all())
area = forms.ModelChoiceField(label="area", queryset=MyArea.objects.all())

district comes from click on city and area comes from click on area. With queryset=MyDistrict.objects.all() and queryset=MyArea.objects.all() form will be very heavy. How can I make querysets empty by default?

marianobianchi · Accepted Answer · 2012-06-28 12:12:29Z

619

You can have an empty queryset by doing this:

MyModel.objects.none()

Although i don't know how are you going to use that form, you can put that as your field's queryset in order to get what you need...

You can find more information here

answered Jun 28, 2012 at 12:12

marianobianchi

8,5382 gold badges23 silver badges24 bronze badges

Sign up to request clarification or add additional context in comments.

2 Comments

radtek Over a year ago

In the use case that your queryset changes in your view based on url parameters. Then in your view you set the correct queryset like so: edit_form.fields["asset"].queryset = Asset.objects.filter(location_id=location_id)

user3064538 Over a year ago

What if I don't have a model, I'm just doing a values_list('something', flat=True)?

sgauri · Accepted Answer · 2018-03-12 06:53:35Z

3

@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)

answered Mar 12, 2018 at 6:53

sgauri

7148 silver badges18 bronze badges

Collectives™ on Stack Overflow

Create empty queryset by default in django form fields

2 Answers 2

2 Comments

Comments

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

2 Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Linked

Related