Ruby - 替换新根路径的路径根

Question

好的，所以我想获取我拥有的文件路径，删除已知的根路径，然后添加一个新路径。

我将尝试举例：

# This one is a path object
original_path = '/home/foo/bar/path/to/file.txt'
# This one is a string
root_path = '/home/foo/bar/'
# This is also a string
new_root = '/home/new/root/'

所以，我有original_path，这是一个路径对象。我想从此删除root_path，并将new_root应用于其前面。我怎么能这样做？

编辑：

这是我真正的问题，对不起之前解释不好：

require 'pathname'

# This one is a path object
original_path = Pathname.new('/home/foo/bar/path/to/file.txt')
# This one is a string
root_path = '/home/foo/bar/'
# This is also a string
new_root = '/home/new/root/'

现在你如何替代那些？

Answer 1

如果你只是想获得一个新的字符串，你可以这样做

# This one is a path object
original_path = '/home/foo/bar/path/to/file.txt'
# This one is a string
root_path = '/home/foo/bar/'
# This is also a string
new_root = '/home/new/root/'

new_path = original_path.gsub(root_path, new_root)

修改

如果sub是gsub

，您仍然可以使用original_path代替Pathname

new_path = original_path.sub(root_path, new_root)