What's the Rails.root equivalent in a Rack application?

问题

I'm familiar with the Rails.root in Rails which tells you the directory of your current application. This is quite handy sometimes.

Now I'm developing a Rack application (on which Rails is based). How do I find out the Rails.root equivalent for a Rack application?

Thank you.

回答1:

This returns the root directory in a string.

Rack::Directory.new('').root

Not sure if there's a better, shorter syntax.

回答2:

What worked for me is a simple File.expand_path:

File.expand_path(File.join("log", "some_file_#{ENV["RACK_ENV"] || "development"}.log"))

来源：https://stackoverflow.com/questions/22835050/whats-the-rails-root-equivalent-in-a-rack-application