How to do a safe join pathname in ruby?

Question

My development environment is in Windows, and my production of rails is in Linux.

There are possibility that VirtualHost will be use. Assume that one finename need to call in /public folder with File.open('/tmp/abc.txt', 'r').

but in my Windows it should be "C:\tmp\abc.txt". How can i do a right join path with two difference environment?

prefix_tmp_path = '/tmp/'
filename = "/#{rand(10)}.txt"

fullname = prefix_tmp_path + filename  # /tmp//1.txt <- which i don't want double //

and if prefix_tmp_path = "C:\tmp\" # C:\tmp\/1.txt

is it possible to do a right joining?

Answer 1

I recommend using File.join

>> File.join("path", "to", "join")
=> "path/to/join"

Answer 2

One thing to note. Ruby uses a "/" for file separator on all platforms, including Windows, so you don't actually need use different code for joining things together on different platforms. "C:/tmp/1.text" should work fine.

File.join() is your friend for joining paths together.

prefix_tmp_path = 'c:/tmp'
filename = "#{rand(10)}.txt"
fullname = File.join(prefix_tmp_path,filename)  #c:/tmp/3.txt