Pass request object to the form: CBV and Form Mixins

If you want to access data from request object in your model form these two mixins will help you to do it easily:

1. You'll need a View mixin like this:

   class RequestFormKwargsMixin(object):
       """
       CBV mixin which puts the request into the form kwargs.
       Note: Using this mixin requires you to pop the `request` kwarg
       out of the dict in the super of your form's `__init__`.
       """
   
       def get_form_kwargs(self):
           kwargs = super(RequestFormKwargsMixin, self).get_form_kwargs()
   
           # Update the existing form kwargs dict with the request's user.
           kwargs.update({"request": self.request})
           return kwargs
   

2. You'll need a form mixin like this:

   class RequestKwargModelFormMixin(object):
       """
       Generic model form mixin for popping request out of the kwargs and
       attaching it to the instance.
   
       This mixin must precede forms.ModelForm/forms.Form. The form is not
       expecting these kwargs to be passed in, so they must be popped off before
       anything else is done.
       """
   
       def __init__(self, *args, **kwargs):
           # Pop the request off the passed in kwargs.
           self.request = kwargs.pop(
               "request", None
           ) 
           super(RequestKwargModelFormMixin, self).__init__(*args, **kwargs)
   

Done! Enjoy this one and remember, there are lots of cool mixins in contrib apps like Django-Braces: https://github.com/brack3t/django-braces.