ModelForm access slug from url

[David]

I have a modelform something like this:

class EventContactForm(ModelForm):

def __init__(self, *args, **kwargs):

super(EventContactForm, self).__init__(*args, **kwargs)

self.fields['event'].queryset = Event.objects.filter(category__slug=SLUGFROMURLHERE).filter(active=True).filter(start_date__gt=datetime.date.today())

self.helper = FormHelper()

self.helper.attrs = {'id': 'id-eventForm',

'class': 'form-vertical',

'autocomplete': 'off'}

self.helper.html5_required = True

self.helper.layout = Layout(

'event',

'first_name',

'last_name',

'company',

'telephone',

'email_address',

'message',

Submit('submit', 'Submit', css_class='btn btn-primary'), 

)

I am having trouble accessing the slug from the url in order to perform the queryset filter (SLUGFROMURLHERE). I am trying to avoid having multiple forms for different category scenarios, because apart from the "event" field, the rest of the forms are identical.

Many thanks for any help.

[David]

I should add that this is in conjunction with a CreateView CBV.

[David]

Sorted by using

    def get_form_kwargs(self):

        kwargs = super(EventForm, self).get_form_kwargs()

        kwargs.update({'category_slug': self.kwargs['category_slug']})

        return kwargs