Upgrade to Rails 6.0 and apply new framework defaults

config/application.rb

@@ -10,8 +10,8 @@ require 'telegraf/rails'
 
 module CodeOcean
   class Application < Rails::Application
-    # Initialize configuration defaults
-    config.load_defaults 5.2
+    # Initialize configuration defaults for originally generated Rails version.
+    config.load_defaults 6.0
 
     # Settings in config/environments/* take precedence over those specified here.
     # Application configuration can go into files in config/initializers
@@ -27,9 +27,21 @@ module CodeOcean
     # config.i18n.default_locale = :de
     config.i18n.available_locales = [:de, :en]
 
-    config.autoload_paths << Rails.root.join('lib')
-    config.eager_load_paths << Rails.root.join('lib')
-    config.assets.precompile += %w( markdown-buttons.png )
+    # Add inflection for Zeitwerk
+    ActiveSupport::Inflector.inflections(:en) do |inflect|
+      inflect.acronym 'IO'
+    end
+
+    extra_paths = %W[
+      #{config.root}/lib
+    ]
+
+    # Add generators, they don't have a module structure that matches their directory structure.
+    extra_paths << "#{config.root}/lib/generators"
+
+    config.add_autoload_paths_to_load_path = false
+    config.autoload_paths += extra_paths
+    config.eager_load_paths += extra_paths
 
     config.action_cable.mount_path = '/cable'