How do I load files from a specific relative path in Ruby?
I'm making a gem for internal use. In it, I load some YAML from another directory:
# in <project_root>/bin/magicwand
MagicWand::Configuration::Initializer.new(...)
# in <project_root>/lib/magicwand/configuration/in开发者_Python百科itializer.rb
root_yaml = YAML.load_file(
File.expand_path("../../../../data/#{RootFileName}", __FILE__))
# in <project_root>/data/root.yaml
---
apple: 100
banana: 200
coconut: 300
I'd rather not depend on the location of data/root.yaml
relative to initializer.rb
. Instead, I'd rather get a reference to <project_root>
and depend on the relative path from there, which seems like a smarter move.
First, is that the best way to go about this? Second, if so, how do I do that? I checked out the various File
methods, but I don't think there's anything like that. I'm using Ruby 1.9.
Right now, I create a special constant and depend on that instead:
# in lib/magicwand/magicwand.rb
module MagicWand
# Project root directory.
ROOT = File.expand_path("../..", __FILE__)
end
but I'm not sure I like that approach either.
If there's a main file you always run you can use that file as a reference point. The relative path (between the current directory and) of that file will be in $0
, so to get the relative path to data/root.yaml
(assuming that is the relative path between the main file and root.yaml
) you do
path_to_root_yaml = File.dirname($0) + '/data/root.yaml'
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