Control when CI jobs run by matching branches, merge requests, and other pipeline conditions with rules; rules replaces only and except in GitLab 12.3+.

Offline gem installation with Bundler requires checking dependencies into the repository and configuring local paths for bundle install without rubygems.org access.

Create and verify bcrypt password hashes for Apache authentication, with safer handling than command-line password entry.

document.currentScript is missing in older browsers, making it hard to read a running <script> element’s attributes or nearby DOM. A simple document.scripts fallback works only for non-async scripts.

Newer Passenger versions change passenger -v output, breaking capistrano-passenger version parsing and causing undefined method '[]' for nil:NilClass during deployment.

Transpiling ES6 JavaScript to ES5 on the command line can produce a smaller output with tsc, but missing APIs still need polyfills.

RubyMine navigation shortcuts can stop working on Ubuntu 20.04 because GNOME steals Ctrl+Alt+Arrow Left/Right for workspace switching. Switching to the default GNOME keymap restores back/forward navigation.

Convert hex color codes to RGB or rgba values in plain Ruby, including 3-, 6- and 8-digit forms with optional opacity.

Rails 4.0 adds collection_check_boxes for rendering checkbox groups from a collection and handling multi-value form params safely.

Online table conversion helps move data between JSON, Markdown and CSV, with transpose support for rotated tables. Not suitable for sensitive data.

Headless Chrome can freeze end-to-end test runs and leave Capybara waiting through long timeouts; restarting sessions regularly and failing fast on lost browser communication reduces hangs.

Browsers block autoplay and popup APIs until a user gesture occurs; a tiny clicked element can unlock them in Capybara tests.

Rails request specs can verify flash messages in the response, letting controller updates surface user feedback such as success or alert notices.

Flaky end-to-end tests often fail because Capybara outpaces client-side JavaScript and AJAX; synchronizing commands with browser activity makes full-stack integration suites more stable.

Geordi 5.4.0 adds geordi branch, MySQL dump speedups, Pivotal Tracker ID support in global config, and fixes for dump load requirements and test processor documentation.

Ruby json accepts duplicate keys by keeping the last value, tolerates comment-like truncation in some cases, and can decode huge exponents to Infinity.

WebMock fails on IPv6 URLs because addresses need brackets before the port, causing invalid URI and port parsing errors in CarrierWave and SsrfFilter.

ZSH can replace Bash on Ubuntu 20.04 and adds command-line conveniences like completion, corrections, themes, and plugins.

Mixed content behavior differs when secure pages load assets over HTTPS versus HTTP, exposing browser handling of blocked or downgraded resources.

Create a Time in a fixed timezone regardless of Rails or system settings; useful for tests and API date comparisons when parsing otherwise shifts by environment.

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

REST API design often fails on timestamps, number handling, pagination, filtering, and versioning. Consistent conventions improve interoperability and client stability.

Legacy ImageMagick installs can be kept available when the system package is unavailable by running convert and related tools in a Docker container with absolute paths.