http://www.reddit.com/r/programming/comments/8q2pz/ask_reddi...
In my case, Appengine does not support recursive SQL queries, so another method had to be used.
http://www.reddit.com/r/programming/comments/8q2pz/ask_reddi...
In my case, Appengine does not support recursive SQL queries, so another method had to be used.