AWS-SDK Route53 creating entries on hosted_zone_id

route53.rb

require 'aws-sdk'
route53 = Aws::Route53::Client.new(
  region: 'sa-east-1',
  access_key_id: 'xxxxx',
  secret_access_key: 'xxxxx'
)

changes = []
changes << { 
  :action => 'CREATE',
  :resource_record_set => {
    :name => host,
    :type => "A",
    :ttl => 300,
    :resource_records => [{:value => ip}]
}}

route53.change_resource_record_sets({
  :hosted_zone_id => 'xxxxxxx',
  :change_batch => {
    :changes => changes
  }
})