fix updating a collection if you don't have access to all the cases

atlas/helpers.py

@@ -1,8 +1,11 @@
 from atlas.models import Case
 
-def get_cases_available_to_user(user):
+def get_cases_available_to_user(user, collection=None):
     """Returns a queryset of cases available to the user"""
     queryset = Case.objects.filter(author=user) | Case.objects.filter(open_access=True)
+
+    if collection is not None:
+        queryset = queryset | collection.cases.all()
     return queryset.order_by("pk")
     if user.is_superuser:
         return Case.objects.all()