如何在Rails中的gem中将不存在的类添加到现有模块

Question

I understand that I can overwrite or to add on to a class that's already existed but I want to add additional class to an existing module(in a gem) so I can keep in constant when I call it. Cuz I though that when rails load up the lib. They should recognize it.

See following example. I would like to add the NotAcceptableHttpResponseError to the same HttpService module

Example module HttpService (in a gem) only have a decent amounts of exceptions class and I would like to add some custom one for others

config/application.rb

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

In the gem/exceptions.rb

module HttpService
   class BadHttpResponseError
     xxx
     xxx
   end

In lib/http_service/exceptions.rb

module HttpService
   class NotAcceptableHttpResponseError
     xxx 
     xxx
   end
end

The Error

NameError(uninitialized constant HttpServices::NotAcceptableHttpResponseError)

Answer 1

Rails 3 does not autoload lib file

1) add this in config/application.rb :

config.autoload_paths += Dir["#{config.root}/lib/**/"]

2) Name of the folder should be the same as the module name and the name of the file should be same as the name of the class(rails naming convention should be followed)
Rename exceptions.rb to name of the class ie, not_acceptable_http_response_error.rb

or

add in config/initializers/require.rb

require "#{Rails.root}/lib/http_service/exceptions" 

Answer 2

Figured out the Answer. It's actually not ideal to modify module that's in the gem. since you will have to fork the project in the gem file and maintain the version if they are updated