Binding data to django's form choicefield - django

Question

I have a simple form,
class Compose(forms.Form):
CHOICES = ()
recepient = forms.ChoiceField(choices=CHOICES)
subject = forms.CharField(max_length=100)
message = forms.CharField(widget=forms.Textarea)
Chocies are generated as
def mychoiceview(request):
subscribed_lists, other_lists = getListOfLists(request.user.email)
for lst in subscribed_lists:
# list name and list address
CHOICES = CHOICES + ((lst[1],lst[0]),)
#Bind data to form and render
Basically, the user is subscribed to certain lists (from a superset of lists) and can choose (via dropdown) which list he/she wants to send the message to.
The problem is that I cannot find how to bind the "CHOICES" to the django form.
Some solutions online include using models.. but I don't have a queryset... just a dynamically generated tuple of ids I want the choicefield to render.
Any ideas ?
Thanks !

Answer 1

#nnmware's solution is correct, but a little too complex/confusing. Below is a more succinct version that works just as well:
class DynamicBindingForm(forms.Form):
def __init__(self, *args, **kwargs):
super(DynamicBindingForm, self).__init__(*args, **kwargs)
self.fields['recipient'] = forms.ChoiceField(choices=db_lookup_choices())
where db_lookup_choices is a call to some database or other set of dynamic data and returns a list of pairs for choices: [('val', 'Label'),('val2', 'Label2')]

Answer 2

If you using Class-based view, then:
in view make mixin for sending request in form
class RequestToFormMixin(object):
def get_form_kwargs(self):
kwargs = super(RequestToFormMixin, self).get_form_kwargs()
kwargs.update({'request': self.request})
return kwargs
class YouView(RequestToFormMixin, CreateView):
model = YouModel
# etc
in form make mixin for receive request from view
class RequestMixinForm(forms.Form):
def __init__(self, *args, **kwargs):
request = kwargs.pop('request')
super(RequestMixinForm, self).__init__(*args, **kwargs)
self._request = request
class Compose(RequestMixinForm):
subject = forms.CharField(max_length=100)
message = forms.CharField(widget=forms.Textarea)
def __init__(self, *args, **kwargs):
super(Compose, self).__init__(*args, **kwargs)
subscribed_lists, other_lists = getListOfLists(self._request.user.email)
for lst in subscribed_lists:
# list name and list address
CHOICES = CHOICES + ((lst[1],lst[0]),)
self.fields['recipient'] = forms.ChoiceField(choices=CHOICES)