+ old_puzzle = find_puzzle_for_sort_key(turb,
+ puzzle['hunt_id'],
+ puzzle['SK'])
+
+ # If we are changing puzzle type (meta -> plain or plain -> meta)
+ # the the sort key has to change, so compute the new one and delete
+ # the old item from the database.
+ #
+ # XXX: We should really be using a transaction here to combine the
+ # delete_item and the put_item into a single transaction, but
+ # the boto interface is annoying in that transactions are only on
+ # the "Client" object which has a totally different interface than
+ # the "Table" object I've been using so I haven't figured out how
+ # to do that yet.
+
+ if puzzle['type'] != old_puzzle.get('type', 'plain'):
+ puzzle['SK'] = puzzle_sort_key(puzzle)
+ turb.table.delete_item(Key={
+ 'hunt_id': old_puzzle['hunt_id'],
+ 'SK': old_puzzle['SK']
+ })