diff --git a/apps/course/manager.py b/apps/course/manager.py
new file mode 100644
index 00000000..76194ef8
--- /dev/null
+++ b/apps/course/manager.py
@@ -0,0 +1,6 @@
+from django.db import models
+
+
+class CategoryQuerySet(models.QuerySet):
+    def all(self):
+        return self.filter()