lib directory is not looked in by default

问题

I following Ryan's subdomain railscast where het creates a Subdomain class used in his routes and places it in the lib directory. Apparantly my rails app isn't looking in the lib dir by default (my app only starts when I move the subdomain.rb file from lib to eg /app/models)

I always thought that the lib dir was included by default in a rails app? How can I best include this directory to make this happen.

Thanks

回答1:

Rails 3 does not autoload it by default (although Rails 2 does). You have to add it to your autoload_paths in application.rb.

module YourRailsApp
  class Application < Rails::Application
    config.autoload_paths += %W(#{Rails.root}/lib)
    #...
  end
end 

For more info on the reason behind this see:

https://rails.lighthouseapp.com/projects/8994/tickets/5218-rails-3-rc-does-not-autoload-from-lib

来源：https://stackoverflow.com/questions/5273419/lib-directory-is-not-looked-in-by-default