code: def as_view(cls, **initkwargs):
          
          if isinstance(getattr(cls, 'queryset', None), models.query.QuerySet):
              def force_evaluation():
                  raise RuntimeError(
                      'Do not evaluate the `.queryset` attribute directly, '
                      'as the result will be cached and reused between requests. '
                      'Use `.all()` or call `.get_queryset()` instead.'
                  )
              cls.queryset._fetch_all = force_evaluation
              cls.queryset._result_iter = force_evaluation  # Django <= 1.5
  
          view = super(RestView, cls).as_view(**initkwargs)
          view.cls = cls
  
          # Note: session based authentication is explicitly CSRF validated,
          # all other authentication is CSRF exempt.
          return csrf_exempt(view)
docs: Store the original class on the view function.
  
          This allows us to discover information about the view when we do URL
          reverse lookups.  Used for breadcrumb generation.