diff --git a/tests/testapp/views.py b/tests/testapp/views.py
index 755e7c2..87bb317 100644
--- a/tests/testapp/views.py
+++ b/tests/testapp/views.py
@@ -10,6 +10,9 @@
 
 
 class BookMixin(object):
+    # or just one line: model = Book
+    def get_queryset(self):
+        return Book.objects.all()
     def get_object(self):
         return Book.objects.get(pk=self.kwargs['book_id'])