Ruby/Rails - Initialize BigDecimal with commas in the String

gistfile1.rb

class BigDecimal
  class << self
    def new_with_commas(*args)
      if args.first.is_a?(String) && args.first=~/,/
        args.first.gsub!(',','')
      end
      new_without_commas(*args)
    end
    alias_method_chain :new, :commas
  end
end