Stage 4: Rails 5.2 -> 6.1 on Ruby 2.7.2

- routing-filter 0.6.3 -> 0.7.0 (Rails 6.1 compatibility)
- RSS named routes rss_xml/rss_rdf added
- RouteWithParams workarounds: will_paginate_patch, content_path shim, safe_path helper
- Paperclip removed, replaced with FileAttachment concern (preserves URL scheme)
- Assets resource moved to /admin/assets (Sprockets middleware conflict)
- ApplicationRecord base class added, all models migrated
- Strong parameters added to Assets, Occurrences, Events, MenuItems controllers
- update_attributes -> update throughout
- render :nothing -> head :ok/:not_found throughout
- language_selector rewritten (removes :overwrite_params)
- Environment files updated for Rails 6.1 (eager_load, public_file_server, ActionMailer)
- Arel::Visitors::DepthFirst and Integer/Float duration patches removed from test_helper
- AssetsController tests added (10 tests covering upload, variants, destroy, auth)
- ImageMagick geometry: 460x250! for headline crop (not # which is invalid in IM6)

129 runs, 311 assertions, 5 failures (all pre-existing), 0 errors

1 files changed, 7 insertions, 9 deletions

diff --git a/Gemfile b/Gemfile
index b43b986..3184db4 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,28 +1,26 @@
 source 'https://rubygems.org'
 
-gem 'rails', '5.2.8.1'
+gem 'rails', '6.1.7.10'
+gem 'concurrent-ruby', '1.3.4'
 
 gem 'pg', '~> 1.0'
 
-gem 'acts-as-taggable-on', '~> 6.0'
+gem 'acts-as-taggable-on', '~> 7.0'
 gem 'awesome_nested_set', '~> 3.4.0'
 gem 'acts_as_list'
-gem 'globalize', '~> 5.2.0'
-gem 'routing-filter', '~> 0.6'
-gem 'paperclip', '~> 3.5'
+gem 'globalize', '~> 6.0'
+gem 'routing-filter', '~> 0.7.0'
 gem 'will_paginate', '~> 3.0'
 gem 'exception_notification', '~> 4.5'
 gem 'libxml-ruby', '~> 3.2', :require => 'xml'
 
-gem 'nokogiri', '~> 1.10.10'
-gem 'loofah', '~> 2.20.0'
-gem 'rails-html-sanitizer', '~> 1.4.4'
+gem 'nokogiri', '~> 1.13'
 gem 'jquery-rails'
 
 gem 'unicorn', '~> 1.1'
 
 group :assets do
-  gem 'sass-rails',   '~> 5.0'
+  gem 'sass-rails', '~> 6.0'
   gem 'coffee-rails', '~> 4.0'
   gem 'uglifier', '>= 1.0.3'
 end