Introduce Rails 8.0 compatibility

Author: gstokkink

.gitignore

@@ -4,3 +4,5 @@
 Gemfile.lock
 pkg/*
 vendor/*
+spec/support/dummy_app/log/*
+spec/support/dummy_app/tmp/*

carrierwave_backgrounder.gemspec

@@ -18,8 +18,9 @@ Gem::Specification.new do |s|
   s.require_paths = ["lib"]
 
   s.add_dependency "carrierwave", ["> 2.0", "< 4.0"]
-  s.add_dependency "rails", ["> 6.0", "< 8.0"]
+  s.add_dependency "rails", [">= 7.2", "< 8.1"]
 
+  s.add_development_dependency "ostruct"
   s.add_development_dependency "rspec", ["~> 3.12"]
   s.add_development_dependency "rake"
   s.add_development_dependency "rspec-rails"

spec/support/dummy_app/app/models/admin.rb

@@ -6,5 +6,5 @@ class Admin < ApplicationRecord
   # Multi attachment support
   mount_uploaders :images, AvatarUploader
   process_in_background :images
-  serialize :images, JSON
+  serialize :images, coder: JSON
 end

spec/support/dummy_app/app/models/user.rb

@@ -6,5 +6,5 @@ class User < ApplicationRecord
   # Multi attachment support
   mount_uploaders :images, AvatarUploader
   store_in_background :images
-  serialize :images, JSON
+  serialize :images, coder: JSON
 end