fields_called_dynamically.rb

require '/Users/rosssinger/Projects/ruby-marc/trunk/lib/marc'
tags = ['001','005', '100','110','111','240','243','245', /^6[0-9][0-9]$/, '700', '710', '711']
recs = 0
fields = 0
MARC::Reader.new('/Users/rosssinger/Downloads/ic_marc.mrc.mrc').each do | rec |
  recs += 1
  tags.each do |tag|
    if tag.is_a?(String)
      t = rec.find_all { | f | f.tag == tag }
    else
      t = rec.find_all { | f | f.tag =~ tag }
    end
    fields += t.length
  end
end
puts "Records: #{recs}"
puts "Fields: #{fields}"