Классы миксинов перенесены в проект

net/xeaf/rack/models/mixins/__init__.py

@@ -11,3 +11,6 @@
 from .created_at_mixin import CreatedAtMixin
 from .deleted_at_mixin import DeletedAtMixin
 from .expired_at_mixin import ExpiresAtMixin
+from .slug_mixin import SlugMixin
+from .updated_at_mixin import UpdatedAtMixin
+from .uuid_id_mixin import UuidIdMixin