Prepare to support ruby 3.3.

lib/custom_gallery/engine.rb

@@ -1,6 +1,7 @@
 module CustomGallery
   class Engine < ::Rails::Engine
     initializer "custom_gallery" do
+      Rails.application.config.to_prepare do
         begin
           translate_data = Dir["#{CustomGallery::Engine.root}/config/locales/*.yml"] .map{|yaml_file| YAML.load(File.read(yaml_file))}
           data = {}
@@ -21,7 +22,7 @@ module CustomGallery
           puts ['error in custom_gallery',e]
         end
 
-      require File.expand_path('../../../app/models/custom_album_setting', __FILE__)
+        require File.join(CustomGallery::Engine.root, 'app/models/custom_album_setting')
         if defined?(CustomAlbumSetting)
           if CustomAlbumSetting.first.nil?
             CustomAlbumSetting.create()
@@ -93,3 +94,4 @@ module CustomGallery
       end
     end
   end
+end