How can I send variables to my forms on init in Django?

I want to send variables to a form in my Django project so that my form's sav开发者_如何学Pythone method associates the correct object with the foreign key in the model.

I tried setting it in the init method, but that doesn't seem to work.

Here is my Form's init:

def __init__(self, rsvp, max_guests=2, *args, **kwargs):
    super(RSVPForm, self).__init__(*args, **kwargs)
    self.rsvp = rsvp
    self.max_guests = rsvp.max_guests

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I think you may be looking for initial:

Use initial to declare the initial value of form fields at runtime. For example, you might want to fill in a username field with the username of the current session.

Pulling directly from the docs:

class CommentForm(forms.Form):
     name = forms.CharField(initial='class')
     url = forms.URLField()
     comment = forms.CharField()
f = CommentForm(initial={'name': 'instance'})

This would yield a form with the initial value of name being 'instance'.