Book Data Merger

gistfile1.rb

require 'json'

class BookMetaMerge
  def initialize(output_file='result_example.file')
    @output_file = output_file
  end

  def merge_files(file1, file2)
    hash_one = JSON.parse(file1)
    hash_two = JSON.parse(file2)
    merged_json = hash_merge(hash_one, hash_two).to_json
    write_to_output_file(merged_json)
  end

  private

  def write_to_output_file(json)
    File.open(@output_file, 'w') { |file| file.write(json) }
  end

  def hash_merge(hash_one, hash_two)
    hash_one.merge(hash_two) do |key, oldval, newval|
      if oldval == newval
        oldval
      elsif oldval.is_a?(Hash) && newval.is_a?(Hash)
        hash_merge(oldval, newval)
      else
        [newval, oldval]
      end
    end
  end
end

merge = BookMetaMerge.new
merge.merge_files(File.read('source1.file'), File.read('source2.file'))