Question

What’s the preferred method to add module functionality to library ruby code?

Consider the following:

module MyExceptions
    class SomethingBadHappenedTheLibarayDesignerDidntConsider < StandardError; end
end

How can I add MyExceptions module to a class that I don’t control?

---

Update, in my_library_class_exceptions.rb I did:

class LibraryClass
    include MyExceptions
end
module MyExceptions
    class SomethingBadHappenedTheLibarayDesignerDidntConsider < StandardError; end
end

But the console returns: NameError: uninitialized constant LibraryClass::MyExceptions

Answer 1

I got this working by fixing a few things, and changing a few things.

1. It turns out LibraryClass wasn’t actually a class, but a module. So I changed:

   class LibraryClass
   include MyExceptions
   end

into to:

module LibraryClass
    module MyExceptions
        class SomethingBadHappenedTheLibarayDesignerDidntConsider < StandardError; end
    end
end

1. Then I moved library_class.rb into lib\library_class_extensions.rb and made sure that lib was part of the autoload path.
2. Then in an initializer, I called require 'library_class_extensions'

I think that’s a better pattern for the behavior I was trying to accomplish anyway, since this really is more of library type code that app/model type code.

I’m up-voting the answers given by everyone, for their heroic efforts.