Hide borrowable section

media/admin.py

@@ -23,7 +23,11 @@ class AuthorAdmin(VersionAdmin):
 class BorrowableAdmin(PolymorphicParentModelAdmin):
     search_fields = ('title',)
     child_models = (CD, Comic, Manga, Novel, Review, Vinyl,)
-    show_in_index = False
+
+    def get_model_perms(self, request):
+        # We don't want that the borrowable items appear directly in
+        # main menu, but we still want search borrowable items.
+        return {}
 
 
 class MediumAdmin(VersionAdmin, PolymorphicChildModelAdmin):