text: Title: iterable gets refiltered by resolve_queryset but iterable might be promise
  Body: I'm trying to use DataLoader but I got a problem in DjangoConnectionField.
  According to the comment, does that means I can't DataLoader here?  My iterable here is Promise.
  
  https://github.com/graphql-python/graphene-django/blob/0da06d4d54d3e73d43d88534259f55733ab7609b/graphene_django/fields.py#L176
  
  