Snippet of a Rails helper proxy to make helpers available from anywhere without polluting namespace

helper_proxy.rb

# use helpers from models or any part of your app (you shouldn't do that, however...)
# ... put in config/initializers
#
# class MyModel < ActiveRecord::Base
#   def some_attribute
#     HelperProxy.instance.number_format some_value, precision: 4
#   end
# end

class HelperProxy
  include Rails.application.helpers
  include ActionView::Helpers::NumberHelper

  def self.instance
    @@instance ||= new
  end
end