Question

This was fixed in Django 1.9 with form_kwargs.

I have a Django Form that looks like this:

class ServiceForm(forms.Form):     option = forms.ModelChoiceField(queryset=ServiceOption.objects.none())     rate = forms.DecimalField(widget=custom_widgets.SmallField())     units = forms.IntegerField(min_value=1, widget=custom_widgets.SmallField())      def __init__(self, *args, **kwargs):         affiliate = kwargs.pop('affiliate')         super(ServiceForm, self).__init__(*args, **kwargs)         self.fields['option'].queryset = ServiceOption.objects.filter(affiliate=affiliate) 

I call this form with something like this:

form = ServiceForm(affiliate=request.affiliate) 

Where request.affiliate is the logged in user. This works as intended.

My problem is that I now want to turn this single form into a formset. What I can’t figure out is how I can pass the affiliate information to the individual forms when creating the formset. According to the docs to make a formset out of this I need to do something like this:

ServiceFormSet = forms.formsets.formset_factory(ServiceForm, extra=3) 

And then I need to create it like this:

formset = ServiceFormSet() 

Now how can I pass affiliate=request.affiliate to the individual forms this way?

Answer 1

I would use functools.partial and functools.wraps:

from functools import partial, wraps from django.forms.formsets import formset_factory  ServiceFormSet = formset_factory(wraps(ServiceForm)(partial(ServiceForm, affiliate=request.affiliate)), extra=3) 

I think this is the cleanest approach, and doesn’t affect ServiceForm in any way (i.e. by making it difficult to subclass).