Question

I want to put my gem monkey patches into e.g. /lib/gem_ext/i18n.rb:

module GemExt
  module I18n
    def self.translate(*args)
      raise 'ok'
    end
  end
end

… and mixin into the gem through a Rails initializer gem_ext.rb.

I tried:

a) I18n.send :include, GemExt::I18n

b) I18n.send :include, GemExt::I18nExt

c) I18n.module_eval { include ::GemExt::I18n }

d) I18n.module_eval { include ::GemExt::I18nExt }

But after restarting the Rails console it doesn’t raise this exception on I18n.translate(“key”) but shows the original behaviour and newly declared methods raise an NoMethodError.

Answer 1

config/initializers/gem_ext.rb

Dir[Rails.root.join("lib/gem_ext/**/*.rb")].each {|f| require f}

lib/gem_ext/i18n.rb

module GemExt::I18n
  extend ActiveSupport::Concern

  included do
    class << self
      def translate(*args)
        raise 'ok'
      end
    end
  end
end

I18n.send(:include, ::GemExt::I18n)