assignable_values now humanizes any supplied value, not only the current attribute value, making alternate labels available for display and lookup.

Pagination tests in Cucumber often need fewer records than the default will_paginate page size. Stubbing per_page per model keeps feature scenarios small.

MySQL query size is limited by max_allowed_packet; the default is 16 MB, so oversized requests can fail unless the server setting is increased.

Rake tasks can gain dependencies after initial declaration, making task relationships easier to extend and keep near prerequisite definitions.

Date.today and Date.tomorrow can return the same day when Rails has no configured time zone, causing date handling to drift between UTC and local time.

Opening a second ActiveRecord database connection can silently disconnect an unfinished transaction. Use a separate abstract class to keep the original connection intact.

Multiple AND and OR conditions can change query results unexpectedly; parentheses make the intended logic explicit and prevent precedence bugs.

Rails 2.3 can use the Rails 3.1 asset pipeline through a backport for managing and serving static assets.

Facebook API access is limited to 600 requests per 600 seconds; polling more often can return empty or malformed responses.

Cloud compilation turns web apps into app-store ready builds for iOS, Android, Windows Phone, BlackBerry and more without changing your HTML, CSS or JavaScript workflow.

Nested drag-and-drop for reorderable trees is hard when items can be leaves or containers; precise drop targets need custom JavaScript, CSS, and testing support.

link_to and content_tag accept a :data hash for HTML5 data attributes in Rails 3, simplifying data-foo and data-bam output.

MySQL can record every received query for debugging at the cost of performance. Enabling the general query log helps inspect database activity on non-production systems.

Custom $.cssHooks normalize browser-specific CSS properties and extend .css() and .animate() handling for inconsistent style values.

Hidden-element checks in Capybara can fail in Selenium when visibility is inferred too loosely. A JavaScript-based step works across Selenium, jQuery, Prototype, and Rack::Test.

A Skype bug could send messages to the wrong recipients, including people outside your contacts. Upgrade to a fixed version immediately.

Determining whether an element is truly visible in the browser can differ across JavaScript libraries; jQuery and Prototype use different visibility rules.

Pinned editor tabs keep important files visible in RubyMine while temporary search results can be closed without losing context.

Clicking arbitrary page text can target any HTML element with a JavaScript handler, not just links or buttons, in Selenium features.

Account profiles now provide a personal RSS feed with the newest public and private cards across all decks.

Short code snippets can be misclassified by automatic syntax highlighting; explicitly declaring the language or using text avoids wrong highlighting or disables it.

Bundler can fail on fresh Ubuntu installs with no such file to load -- net/https when Ruby lacks OpenSSL bindings, blocking gem downloads.