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In certain cases the Django generic views will behave like they are caching data. They are doing that for the queryset argument and not for extra_context which is known to be cached. This will happen if you send to the generic view a queryset filtered with a callable.

Let's take as an example a blogging application. In blog.models we have:

class PublishedManager(Manager): 
    def get_query_set(self): 
        queryset = super(PublishedManager, self).get_query_set() 
        return queryset.filter(pub_date__lte=datetime.now) 

class Entry(models.Model): 
    ... 
    pub_date = models.DateTimeField() 
    published = PublishedManager() 
    ... 

In blog.urls:

info_dict = {'queryset': Entry.published.all()} 

entry_list = url( regex = '^$', 
    view ...