How to recognize that ndb query is sorted and how to reverse sort order without knowledge of sort order?

Question

1. How can I check if query is sorted?

   class Thing(ndb.Model): pass

   query = Thing.query().sort(Thing.id)

2. How can I reverse such sort?

Answer 1

query.orders will return a datastore_query.Order , which has a reversed method, so something like:

query = Thing.query().order(Thing.id)
[...]
order = query.orders
reversed_order = order.reversed()
new_query = Thing.query().order(reversed_order)

If there isn't an order on the query, order will be None