Better transition period handling (#18)

Gemfile.lock

@@ -1,7 +1,7 @@
 PATH
   remote: .
   specs:
-    uuidable (1.0.2)
+    uuidable (1.0.3)
       activerecord (>= 4.2, < 7.2)
       mysql-binuuid-rails (>= 1.3, < 2)
       uuidtools (>= 2.1, < 3)

lib/uuidable.rb

@@ -17,4 +17,5 @@ def generate_uuid
 
 require 'uuidable/migration'
 require 'uuidable/v1_migration_helpers'
+require 'uuidable/v1_model_migration'
 require 'uuidable/active_record'

lib/uuidable/active_record.rb

@@ -30,16 +30,17 @@ def uuidable(as_param: true) # rubocop:disable Metrics/AbcSize, Metrics/Cyclomat
             columns.select { |c| c.type == :binary && c.limit == 16 && c.name.include?('uuid') }.each do |column|
               attribute column.name.to_sym, MySQLBinUUID::Type.new
             end
+
+            include V1ModelMigration if columns.any? { |c| c.name.include?(V1MigrationHelpers::OLD_POSTFIX) }
           rescue ::ActiveRecord::ConnectionNotEstablished, Mysql2::Error::ConnectionError, ::ActiveRecord::NoDatabaseError # rubocop:disable Lint/SuppressedException
           end
         end
 
         after_initialize do
           self.uuid = Uuidable.generate_uuid if attributes.keys.include?('uuid') && uuid.blank?
-          self.uuid__old = uuid if respond_to?(:uuid__old)
         end
 
-        validates :uuid, presence: true, uniqueness: true, if: :uuid_changed?
+        validates :uuid, presence: true, uniqueness: true, if: -> { try :uuid_changed? }
 
         if as_param
           define_method :to_param do

lib/uuidable/v1_model_migration.rb

@@ -0,0 +1,19 @@
+# frozen_string_literal: true
+
+module Uuidable
+  # Temporary helpers for transition period when migrating to v1
+  module V1ModelMigration
+    extend ActiveSupport::Concern
+
+    included do
+      before_validation do
+        attributes.each_key do |attr_name|
+          next unless attr_name.include?(V1MigrationHelpers::OLD_POSTFIX)
+
+          new_attr_name = attr_name.gsub(V1MigrationHelpers::OLD_POSTFIX, '')
+          public_send("#{attr_name}=", attributes[new_attr_name].to_s)
+        end
+      end
+    end
+  end
+end

lib/uuidable/version.rb

@@ -1,5 +1,5 @@
 # frozen_string_literal: true
 
 module Uuidable
-  VERSION = '1.0.2'
+  VERSION = '1.0.3'
 end