ruby - Ruby：如何计算相对于另一个路径的路径？

Question

假设我知道我开始的绝对路径和我试图到达的绝对路径：

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

现在我想弄清楚如何构建一个相对于第一个路径。例如：

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

我怎样才能在 Ruby 中做这种事情？

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