Rails 2-compatible versions of Cucumber, Capybara, and related gems avoid breakage from newer dependencies and Capybara API changes.

Encrypted connections between Rails and Amazon RDS MySQL protect sensitive data in transit. mysql and database.yml can be configured to require SSL end to end.

Rails has both truncate helper and String#truncate; the helper is preferred for block support and safer HTML handling, especially with escape: false.

Webpacker-only Rails deploys can fail on deploy:assets:backup_manifest because capistrano-rails expects Sprockets assets. Clearing that task avoids the missing manifest error.

Rails database tasks can fail with ActiveRecord::EnvironmentMismatchError after restoring a dump from another environment. Updating ar_internal_metadata or disabling the environment check lets rails db:drop proceed.

Terminator can split Rails debugging into separate panes, keeping the web server and other Procfile processes visible without mixed log output.

ActionMailer defaults to http in email links, which can expose session cookies to SSL-stripping. Set default_url_options or the link protocol to use https where needed.

Persist ActiveRecord records directly when callbacks and validations are unnecessary; Rails 2 has create_without_callbacks and update_without_callbacks, while Rails 3 needs sneaky-save.

ActiveRecord migrations can break when STI models are referenced directly; embedding model classes in the migration and overriding find_sti_class and sti_name keeps type lookup working.

reverse_order breaks on complex SQL sorting and can generate invalid queries in Rails 4; Rails 5 raises ActiveRecord::IrreversibleOrderError instead.

Bundler support for Rails 2.3.x requires updated RubyGems and Passenger, a bundled Gemfile workflow, and bundle exec for tests and deployment.

CSS sprites can reduce image requests by bundling small backgrounds into one sprite; Compass and compass-rails automate sprite generation in Rails apps.

Rails secrets and other configuration values can be read inside webpack bundles with rails-erb-loader, enabling environment-specific client-side settings without hardcoding them.

1.year returns a Float in Rails < 4 and can break code that expects an integer duration; Rails 4 uses ActiveSupport::Duration instead.

Rails asset management becomes easier with bower-rails, using a Bowerfile and rake tasks to install, list, update, and rewrite vendored front-end packages.

Rails routing can make singleton collection pages awkward to place under a namespace without adding :project_id; custom controller paths or namespace/resource combinations keep URLs and controllers aligned.

Splitting Rails route definitions across multiple files can improve organization in larger apps. Rails::Engine and config.paths['config/routes.rb'] can load route files from config/routes/.

Temporary, tamper-resistant links can be built in Rails without extra database columns or conditional logic by using ActiveRecord's signed_id and .find_signed.

rspec_rails with Rails 6.1 can raise WrongScopeError; upgrading the gem to 4.0.1 or later resolves the failure.

Rails 2 apps can break on MySQL 5.7; MariaDB 10.x is a compatible replacement for old and new applications, with gem rebuilds sometimes needed after switching.

Sidekiq jobs lose request context in Rails logs, making parallel worker output hard to trace. Tagging log lines with worker class and jid keeps job activity readable.

Old PostgreSQL dumps can fail to load when their schema no longer matches the current Rails database; restoring them often requires checking out the migration version used when the dump was created.

Recent Rails 2 CookieStore versions can emit malformed Set-Cookie headers with blank lines, breaking Cucumber integration tests when cookies are written more than once.