change route53 ruby aws sdk

route53.rb

require 'aws-sdk-core'

zid = nil
r53 = Aws::Route53.new
r53.list_hosted_zones[:hosted_zones].each do |zone|
  id = zone[:id].match(/\/hostedzone\/(.*)/)[1]
  puts zone[:name] + ':' + id
  if (zone[:name] == "testing.com.") then zid = id end
end

# zone
zoneinfo = r53.get_hosted_zone({:id => zid})
 
# records for zone
records = r53.list_resource_record_sets({:hosted_zone_id => zid})
 
# get resource by dns name
resp = r53.list_resource_record_sets({:hosted_zone_id => zid, :start_record_name => "dns.testing.com", :max_items => 1})

# create or change dns 
resp = r53.change_resource_record_sets({ 
  :hosted_zone_id => zoneinfo, 
  :change_batch => {
    :comment => "create subdomain", 
    :changes => [{
      :action => "UPSERT", 
      :resource_record_set => {
        :name => "dns.testing.com",
        :type => "A",
        :ttl => 300,
        :resource_records => [{
          :value => "172.192.1.26"
      }]
    }
  }]
}})