红宝石：如何相对于另一个路径计算？(Ruby: How to calculate a path re

比方说，我知道，我从开始的绝对路径，我想获得的绝对路径：

first = '/first/path'
second = '/second/path'

现在我想弄清楚如何构建是相对于第一路径。 例如：

# answer should be /first/path/../../second/path
path = second.get_path_relative_to(first)

我怎样才能做到这样的事情在Ruby中？

Answer 1:

使用Pathname#relative_path_from ：

require 'pathname'

first = Pathname.new '/first/path'
second = Pathname.new '/second/path'

relative = second.relative_path_from first
# ../../second/path

first + relative
# /second/path

文章来源: Ruby: How to calculate a path relative to another one?