Rails 2.3 tests can fail with NoMethodError: undefined method 'cache' for Gem:Module when used with newer RubyGems; downgrading RubyGems restores generator lookup behavior.

Geordi 1.3 adds Cucumber support with @solo handling, Capistrano 2/3 deployment fixes, and updated Firefox setup for selenium testing.

Use SQL views in a Rails app without switching the schema format to SQL; Scenic adds versioned, reversible migrations and keeps view definitions in SQL files.

Dashboard and query tools for Elasticsearch provide local access to Kibana and Sense through Marvel plugins.

column aligns delimited text into readable tables in bash, making pipe-separated output and other simple listings easy to format.

Script to migrate test suites from RSpec 2 to RSpec 3, including syntax beyond should and expect.

Identify processes with pages in swap and rank them by VmSwap; swap usage reflects page activity, not total memory pressure.

List PostgreSQL database sizes in megabytes with pg_database_size, useful for spotting large databases and planning storage.

Rails treats html_safe strings as already escaped, which can block escaping when safe HTML must be passed through JSON or shown as text. Converting to a plain String restores escaping.

HTML email layout remains fragile, and several 2015 email changes made rendering problems worse rather than better.

rack-mini-profiler helps spot slow Rack and Rails requests by measuring SQL queries, memory allocation, and CPU time.

Remove a Puppet certificate request from the certificate authority on the puppetmaster when a node needs to be re-enrolled or cleaned up.

Handy CSS tricks solve common layout and styling problems with concise expressions and modern browser features.

Use Sizzle via $.find to select descendants from plain DOM nodes when jQuery collections are unavailable, too slow, or awkward for whole-document work.

Opera Mini leaves many modern front-end features unusable on mobile, especially in markets where it dominates. Practical workarounds help keep sites functional.

Geordi 1.2 adds more flexible deploys, better Cucumber reruns and debugging, and reorganized Firefox and VNC command handling.

Many MySQL or MariaDB connections can make SHOW PROCESSLIST hard to scan; sleeping sessions can be hidden with a pager filter or by querying metadata directly.

Ruby 2.3 adds <<~ to strip leading indentation from HEREDOCs, making multiline strings easier to read without changing their output.

Feature branches accumulate after merges and stale local references remain after remote deletions; git branch --merged, git branch -d, and git fetch --prune keep repositories clean.

Browser popup blocking prevents window.open from Selenium; injecting a clickable temporary link opens a new tab reliably in Chrome.

A beta style guide sets conventions for new AngularJS code written in CoffeeScript, with the overall structure intended to stay stable.

:has enables parent-style selection in CSS, matching elements that contain a given descendant. jQuery already supports the selector as a custom extension.

Quoted-printable mail encoding turns characters like = into escape sequences and may wrap long lines. Ruby can decode and encode it with unpack('M') and pack('M').

Running Ruby commands without bundle exec becomes simpler by installing a gem that makes b and direct execution work smoothly.