Do not validate uniqueness if nothing changed

Gemfile.lock

@@ -1,29 +1,28 @@
 PATH
  remote: .
  specs:
- uuidable (0.2.4)
+ uuidable (0.2.5)
  activerecord (>= 4.2, < 6.1)
  uuidtools (>= 2.1, < 3)
 
 GEM
  remote: https://rubygems.org/
  specs:
- activemodel (5.2.4.4)
- activesupport (= 5.2.4.4)
- activerecord (5.2.4.4)
- activemodel (= 5.2.4.4)
- activesupport (= 5.2.4.4)
- arel (>= 9.0)
- activesupport (5.2.4.4)
+ activemodel (6.0.3.5)
+ activesupport (= 6.0.3.5)
+ activerecord (6.0.3.5)
+ activemodel (= 6.0.3.5)
+ activesupport (= 6.0.3.5)
+ activesupport (6.0.3.5)
  concurrent-ruby (~> 1.0, >= 1.0.2)
  i18n (>= 0.7, < 2)
  minitest (~> 5.1)
  tzinfo (~> 1.1)
+ zeitwerk (~> 2.2, >= 2.2.2)
  addressable (2.4.0)
- arel (9.0.0)
  ast (2.3.0)
  backports (3.6.8)
- concurrent-ruby (1.1.7)
+ concurrent-ruby (1.1.8)
  diff-lcs (1.2.5)
  ethon (0.8.1)
  ffi (>= 1.3.0)
@@ -40,12 +39,12 @@ GEM
  net-http-persistent (>= 2.7)
  net-http-pipeline
  highline (1.7.8)
- i18n (1.8.5)
+ i18n (1.8.9)
  concurrent-ruby (~> 1.0)
  json (2.3.1)
  launchy (2.4.3)
  addressable (~> 2.3)
- minitest (5.14.2)
+ minitest (5.14.3)
  multi_json (1.11.2)
  multipart-post (2.0.0)
  net-http-persistent (2.9.4)
@@ -93,11 +92,12 @@ GEM
  typhoeus (~> 0.6, >= 0.6.8)
  typhoeus (0.8.0)
  ethon (>= 0.8.0)
- tzinfo (1.2.7)
+ tzinfo (1.2.9)
  thread_safe (~> 0.1)
  unicode-display_width (1.3.0)
- uuidtools (2.1.5)
+ uuidtools (2.2.0)
  websocket (1.2.2)
+ zeitwerk (2.4.2)
 
 PLATFORMS
  ruby

lib/uuidable/active_record.rb

@@ -21,7 +21,7 @@ module ClassMethods
 
  def uuidable(as_param: true)
  after_initialize { self.uuid = Uuidable.generate_uuid if attributes.keys.include?('uuid') && uuid.blank? }
- validates :uuid, presence: true, uniqueness: true
+ validates :uuid, presence: true, uniqueness: true, if: :uuid_changed?
 
  if as_param
  define_method :to_param do

lib/uuidable/version.rb

@@ -1,3 +1,3 @@
 module Uuidable
- VERSION = '0.2.4'.freeze
+ VERSION = '0.2.5'.freeze
 end