Rails Ancestry：我如何得到子树深度为n的后代？

Question

我有一个节点，我感兴趣的后代。但我感兴趣的是在特定深度找到的后代。我怎么做？

Answer 1

https://github.com/stefankroes/ancestry#selecting-nodes-by-depth

Use the at_depth(n)

n being the depth of the nodes that you want to return

Note: the depth begins with value 0```