Neo4j.rb 中的方法 "rel_length" 无效。

Method "rel_length" in Neo4j.rb doesn't work.

我需要 "friends of friends" 个 User。所以,friend(rel_length: 2)不起作用(忽略方法),返回朋友。

class User
  include Neo4j::ActiveNode
  ...
  has_many :out, :friend, rel_class: Friend
  ...
end

class Friend
  include Neo4j::ActiveRel
  from_class User
  to_class User
  type 'friend'

  property :activity, type: String
  property :relation, type: String
  property :token, type: String
end

对于后来发现此问题的任何人,原因是因为他使用的是 gem 的旧版本(请参阅评论)