class BaseDetailView(BaseView):

    def __init__(self, queryset, slug_field='slug'):

        self.slug_field = slug_field

        super(BaseDetailView, self).__init__(queryset)

    def get_object(self, request, object_pk=None, slug=None):

        """

        Returns the object to be viewed, changed or deleted, or raises a 404

        if it doesn't exist.

        """

        # Look up the object to be changed or deleted

        lookup_kwargs = {}

        if object_pk:

            lookup_kwargs['pk'] = object_pk

        elif slug and self.slug_field:

            lookup_kwargs[self.slug_field] = slug

        else:

            raise AttributeError("Generic view must be called with either an object_pk or a slug/slug_field")

        try:

            return self.get_query_set(request).get(**lookup_kwargs)

        except ObjectDoesNotExist:

            raise Http404, "No %s found for %s" % (self.model._meta.verbose_name, lookup_kwargs)

        super(ModelView, self).__init__(queryset, slug_field)