Auto-loading lib files in Rails 4

I use the following line in an initializer to autoload code in my /lib directory during development: config/initializers/custom.rb: RELOAD_LIBS = Dir[Rails.root + 'lib/**/*.rb'] if Rails.env.development? (from Rails 3 Quicktip: Auto reload lib folders in development mode) It works great, but it's too inefficient to use in production- Instead of loading libs on each request, I just want to load the

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“if you really wanna do some monkey patches in file like lib/extensions.rb, you may manually require it: in config/initializers/require.rb: require "#{Rails.root}/lib/extensions" ”

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“config.autoload_paths += %W(#{config.root}/lib)”