record.rb
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	require 'ipaddr'

	class Record < ActiveRecord::Base
	belongs_to :domain

	def self.record_types
	[
	'SOA', 'NS', 'CNAME',
	'A', 'AAAA',
	'MX',
	'TXT', 'SPF', 'SRV', 'SSHFP',
	'PTR',
	]
	end

	validates :name, presence: true
	validates :type, inclusion: { in: record_types }

	before_validation :guess_reverse_name
	before_validation :set_name
	after_save :update_zone_serial
	after_destroy :update_zone_serial

	def short
	return '' if name == domain.name
	return '' if name.blank?

	File.basename(name, ".#{domain.name}")
	end

	def supports_prio?
	false
	end

	# Create record specific urls for all record types
	#
	# Overrides default rails STI
	def self.model_name
	return super if self == Record

	Record.model_name
	end

	def to_dns
	[name, 'IN', type, supports_prio? ? prio : nil, content].compact.join(' ')
	end

	private

	# Hooks

	def guess_reverse_name
	return if not type == 'PTR'
	return if not domain.reverse?
	return if name.blank?

	reverse = IPAddr.new(name).reverse
	self.name = reverse if reverse.end_with?(domain.name)
	rescue IPAddr::InvalidAddressError # rubycop:disable HandleExceptions
	end

	# Powerdns expects full domain names
	def set_name
	self.name = domain.name if name.blank?
	self.name = "#{name}.#{domain.name}" if not name.end_with?(domain.name)
	end

	def update_zone_serial
	# SOA records handle serial themselves
	return true if type == 'SOA'

	domain.soa.bump_serial!
	end

	end