When configloader is used in a Rails App, it's better to rely on Rail…

…s.env instead of ENV['RAILS_ENV'] or ENV['RACK_ENV']. Also, it's betther to rely on Rails.root, instead of ENV['RAILS_ROOT'] or ENV['RACK_ROOT']. So I changed the loader in order to firstly use Rails.env and Rails.root, but fallback to the environment variables if necessary.

lib/config_loader.rb

@@ -47,7 +47,19 @@ module ConfigLoader
   #       server: <%= `hostname` %>
   #       port: 5984
   #       database_name: addressbook_test
-  def self.load(file_name, running_env = ENV['RAILS_ENV'], project_root = ENV['RAILS_ROOT'])
+  def self.load(file_name, running_env = default_running_env, project_root = default_project_root)
     ConfigLoader::Map.new(file_name, running_env, project_root).load
   end
+
+  private
+
+  def self.default_running_env
+    return Rails.env if defined?(Rails)
+    ENV['RAILS_ENV'] || ENV['RACK_ENV']
+  end
+
+  def self.default_project_root
+    return Rails.root if defined?(Rails)
+    ENV['RAILS_ROOT'] || ENV['RACK_ROOT']
+  end
 end