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soa.rb
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	class SOA < Record
	validates :domain_id, uniqueness: true
	validates_numericality_of :serial, :refresh, :retry, :expire
	validates_presence_of :contact

	SOA_DEFAULTS = WebDNS.settings[:soa_defaults]
	SOA_FIELDS = SOA_DEFAULTS.keys

	SOA_FIELDS.each { \|soa_entry\|
	attr_accessor soa_entry
	}

	# Handle SOA Fields
	after_initialize :set_soa_fields

	# Load soa fields on reload
	def reload_with_soa_fields(*args)
	reload_without_soa_fields(*args).tap {
	set_soa_fields
	}
	end
	alias_method_chain :reload, :soa_fields

	before_validation :set_content
	before_validation :update_serial, on: :update

	def bump_serial!
	with_lock {
	reload
	generate_serial
	save!
	}
	end

	def serial_changed?
	return false if not self.content_changed?

	serial_index = SOA_FIELDS.index(:serial)
	old, new = content_change.map { \|c\|
	(c \|\| '').split(/\s+/)[serial_index]
	}

	old != new
	end

	private

	def generate_serial
	self.serial = domain.serial_strategy.generate_serial(serial)
	end

	# Callbacks

	def set_soa_fields
	content_values = (content \|\| '').split(/\s+/)
	SOA_DEFAULTS.each { \|field, default_value\|
	val = content_values.shift \|\| default_value
	val = Integer(val) if default_value.is_a?(Integer)
	send("#{field}=", val)
	}
	end

	def set_content
	self.content = SOA_FIELDS.map { \|field\| send(field) }.join(' ')
	end

	def update_serial
	# Don't update if nothing has changed
	return if not self.content_changed?
	# Don't updade if serial is already changed
	return if self.serial_changed?

	generate_serial
	set_content
	end

	end