Extend a gem module with an instance method

Question

Im trying to extend a InstanceMethods of a gem (Globalize)

module Globalize
  module ActiveRecord
    module InstanceMethods 
      def foo
        puts "Bar!"
      end
    end
  end
end

However, this overwrites the existing instance methods of Globalize.

What is the correct way of giving a previously declared module additional instance methods?

Update: Trying to require them doesnt seem to work either:

module Globalize
  require 'globalize'
  module ActiveRecord
    require 'globalize/active_record'
    module InstanceMethods
      require 'globalize/active_record/instance_methods'
      def foo
        puts "Bar!"
      end
    end
  end
end

Update: By using answer provided by roxxypoxxy I can extend the instance methods by adding his answer to a initializer

roxxypoxxy · Accepted Answer · 2015-03-18 20:09:58Z

2

You can do

Globalize::ActiveRecord::InstanceMethods.class_eval do
    # patch methods
end

answered Mar 18, 2015 at 20:09

roxxypoxxy

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2 Comments

Marcus Brunsten Over a year ago

where would i put this? In an initilizer?

roxxypoxxy Over a year ago

Yeah. You can make a .rb file at config/initializers/ or you should be able to put it in lib folder also

Chris Heald · Accepted Answer · 2015-03-18 20:00:13Z

1

You probably just need to be sure you require the module before monkeypatching it; if it is relying on the autoloader to load those files, then defining them will prevent the autoloader from attempting to require them. Globalize is indeed relying on the autoloader, as seen here.

To fix it, explicitly require those modules before patching them:

 require 'globalize'
 require 'globalize/active_record'
 require 'globalize/active_record/instance_methods'

 # Patch your stuff here.

answered Mar 18, 2015 at 20:00

Chris Heald

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3 Comments

Marcus Brunsten Over a year ago

Hmm, didnt get it to work. perhaps i missplaces them?

Chris Heald Over a year ago

Try ensuring that the module exists and has the methods you are interested in before you patch it. What behavior are you seeing?

Marcus Brunsten Over a year ago

InstanceMethods, such as translated_attributes gives "undefined method `translated_attributes'". But my foo method is there.

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