Hash class with flatten method added

FlatteableHash

class FlatteableHash
 def flatten(ancestor_names = [])
      flat_hash = {}

      each do |key, value|
        names = Array.new(ancestor_names)
        names << key

        if value.is_a?(Hash)
          value = FlatteableHash.new(value)
          flat_hash.merge!(value.flatten(names))
        else
          flat_key = names.shift.to_s.dup
          names.each do |name|
            flat_key << "[#{name}]"
          end
          if value.is_a?(Array)
            value.each_with_index do |array_val, i| 
              array_names = names + [flat_key + "[#{i}]"]
              array_val = FlatteableHash.new(array_val)
              flat_hash.merge!(array_val.flatten(array_names))
            end
          else
            flat_hash[flat_key] = value
          end
        end
      end

      flat_hash
    end
  end
end