[Django]-How to customize Haystack's SearchView to accept addtional URL parameters?

Subclass SearchView and override __call__ which is the “view” part of the class.

from haystack.views import SearchView

class MySearchView(SearchView):

    def __call__(self, request, some_var):
        self.some_var = some_var
        return super(MySearchView, self).__call__(request)

Then, you can use self.some_var in other methods on the class.