Rails Expanded_Key

rails_expanded_key.rb

def expanded_key(key) # :nodoc:
  return key.cache_key.to_s if key.respond_to?(:cache_key)

  case key
  when Array
    if key.size > 1
      key = key.collect{|element| expanded_key(element)}
    else
      key = key.first
    end
  when Hash
    key = key.sort_by { |k,_| k.to_s }.collect{|k,v| "#{k}=#{v}"}
  end

  key.to_param
end