compare two yaml files in ruby

yaml_compare.rb

#require 'active_support/core_ext'

class YamlCompare
  def self.compare_keys first_file_info, second_file_info, results_location
    first_file = Hash.new
    second_file = Hash.new
    deltas_file = Hash.new
    File.open( first_file_info[:file_location] ) { |yf| first_file =  YAML.load( yf ) }
    File.open( second_file_info[:file_location] ) { |yf| second_file =  YAML.load( yf ) }
    first_file[first_file_info[:root]].each_pair do |k,v|
      test_read = second_file[second_file_info[:root]][k]
      puts test_read
      if test_read.nil? || test_read.eql?('nil')
        deltas_file[k] = v
      end
    end
    File.open( results_location, 'w' ) { |f| f.write( deltas_file.to_yaml )}
  end
end