File.expand_path(“../../Gemfile”, __FILE__) How does this work? Where is the file?

Question

ENV[\"BUNDLE_GEMFILE\"] = File.expand_path(\"../../Gemfile\", __FILE__)

I\'m just trying to access a .rb file from the some directory and a tutorial is

Answer 1

Two references:

1. File::expand_path method documentation
2. How does __FILE__ work in Ruby

I stumbled across this today:

boot.rb commit in the Rails Github

If you go up two directories from boot.rb in the directory tree:

/railties/lib/rails/generators/rails/app/templates

you see Gemfile, which leads me to believe that File.expand_path("../../Gemfile", __FILE__) references following file: /path/to/this/file/../../Gemfile