Calling instance_eval or instance_exec on a Rails 2 scope loads its records from the database. The issue is fixed in Rails 3+.

Need the alpha value of a PNG pixel in Gimp? The color picker can reveal transparency information for a clicked pixel.

Xfce lacks a graphical cursor selector, so the mouse pointer theme must be changed from the terminal with update-alternatives and a new login session.

jQuery plugin for selecting a rectangular area of an image and adding cropping or photo note interactions in web apps.

jQuery plugin for packing page content into a dynamic, responsive layout that uses screen space efficiently.

Rails app boot and test startup become slow as gems grow; Zeus preloads the app so console, server, generate, and specs run in under a second.

Converts HTML tables into bar charts with a jQuery plugin, offering several variants for displaying tabular data visually.

Capybara 2.0 breaks compatibility with 1.x and drops Ruby 1.8 support. It changes Rails integration test conventions, element matching, and RSpec syntax.

andand does not cooperate with SimpleDelegator; the call can skip the decorator and reach the wrapped object. Overriding andand in the delegator restores the intended chaining.

Reduces database storage for many-to-many links when the same combinations repeat often. Works only for simple join records without extra attributes or callbacks.

A MysqlCompat::MysqlRes NameError often follows a system library change, especially switching from MySQL to MariaDB. Reinstalling the MySQL gems usually restores compatibility.

Changing a file extension’s default opener in Thunar lets all matching files open in the preferred app instead of the wrong one.

Move the active window to the next monitor in Xfce, MATE, and other X window managers using a small script with xdotool and wmctrl.

Local Ubuntu release upgrades need mirrored meta-release files and do-release-upgrade packages from proposed repositories to avoid falling back to the public archive.

Applications that use the generic Monospace family ignore terminal font settings. A fontconfig override in ~/.fonts.conf can map it to a preferred font.

Tagged JPEGs from cameras can appear sideways when CarrierWave ignores orientation metadata. auto_orient corrects rotation before other processing steps.

JavaScript engines such as V8 are optimized for speed, but memory use still affects performance in large applications. Understanding engine behavior helps reduce browser overhead.

Native Ruby gems can break after system library or distribution upgrades, causing warnings, segfaults, or missing shared-object errors. gem pristine --all rebuilds compiled extensions and resets gems to a clean state.

query_diet now works with Rails 3, with installation differing slightly from older versions.

List every Active Record relationship on a model and inspect each association’s name, class name, or type via reflection.

Preview Subtle Patterns textures on a site without swapping images or changing CSS.

Keyboard-driven web navigation reduces mouse use and can speed up common browser actions, with selector-based element picking for command-line-minded users.

Icon fonts are awkward to use directly in Rails views; helpers and Sass mixins make icon classes, labels, and styling easier to manage.