diff --git a/app/models/domain.rb b/app/models/domain.rb
index cec8552..1f69578 100644
--- a/app/models/domain.rb
+++ b/app/models/domain.rb
@@ -1,75 +1,76 @@
 class Domain < ActiveRecord::Base
   self.inheritance_column = :nx
 
   def self.domain_types
     [
       'NATIVE',
       'MASTER',
       'SLAVE',
     ]
   end
 
   belongs_to :group
   has_many :records
   has_one :soa, class_name: SOA
 
   validates :group_id, presence: true
   validates :name, uniqueness: true, presence: true
   validates :type, presence: true, inclusion: { in: domain_types }
 
   after_create :generate_soa
 
   attr_writer :serial_strategy
   def serial_strategy
     @serial_strategy ||= WebDNS.settings[:serial_strategy]
   end
 
   def reverse?
     name.end_with?('.in-addr.arpa') || name.end_with?('.ip6.arpa')
   end
 
   # Compute subnet for reverse records
   def subnet
     return if not reverse?
 
     if name.end_with?('.in-addr.arpa')
       subnet_v4
     elsif name.end_with?('.ip6.arpa')
       subnet_v6
     end
   end
 
   private
 
   def subnet_v4
     # get ip octets (remove .in-addr.arpa)
     octets = name.split('.')[0...-2].reverse
     return if octets.any? { |_| false }
 
     mask = 8 * octets.size
     octets += [0, 0, 0, 0]
 
     ip = IPAddr.new octets[0, 4].join('.')
 
     [ip, mask].join('/')
   end
 
   def subnet_v6
     nibbles = name.split('.')[0...-2].reverse
     return if nibbles.any? { |_| false }
 
     mask = 4 * nibbles.size
     nibbles += [0] * 32
 
     ip = IPAddr.new nibbles[0, 32].in_groups_of(4).map(&:join).join(':')
 
     [ip, mask].join('/')
   end
 
   # Hooks
   def generate_soa
     soa_record = SOA.new(domain: self)
-    soa_record.save
+
+    soa_record.save!
   end
 
 end