Choosing a JavaScript MV* framework is difficult when options look similar; TodoMVC provides the same Todo app across popular frameworks for side-by-side comparison.

Reverting an old Rails change can reuse the original migration’s up and down logic instead of copying SQL, but only for simple cases.

Ctrl+Shift+A opens RubyMine’s Find Action box to run menu commands by name when the shortcut or menu location is unknown.

Exclude log, data, and other irrelevant directories in RubyMine to speed up searches and reduce noisy results without deleting files.

git diff --word-diff highlights inline changes within long lines, and disabling the pager can keep the output directly in the terminal.

Updating WebMock to 1.8.0 can let unstubbed specs send real HTTP requests when Curb is older than 0.7.16.

TeamViewer 6 and earlier treated multi-monitor Linux desktops as one large display. Version 7 adds proper screen selection for remote sessions.

Complex will_paginate scopes can trigger a slow total-count query, especially with many includes, delaying search results pages.

Umlauts in Sunspot and Solr can fail on Tomcat even when local Jetty-based searches work; a UTF-8 bug in RSolr caused empty results until version 1.0.6.

has_select? can fail with Cucumber, Capybara, and Selenium when the selected option has no value, so driver-specific handling may be needed.

.ova packages are tar archives containing an .ovf descriptor, so extracting them yields the virtual machine definition and related files.

def_delegator and def_delegators are hard to read; delegate or a small wrapper method makes Rails delegation clearer.

A lightweight JavaScript date library for parsing, manipulating, and formatting dates.

Run custom setup code before selected RSpec examples using metadata tags instead of Cucumber scenarios.

Invalid gemspecs and ill-formed requirements often come from the Syck-to-Psych transition; replacing Syck::DefaultKey entries with = in affected gemspec files resolves the error.

Selection highlight color can be customized with CSS using ::selection and ::-moz-selection; Firefox needs the vendor-specific pseudo-element.

REST Client adds application/xml to simple GET requests, which can trigger unexpected server responses. :accept => :html requests the default text/html content type instead.

Preview email in the browser instead of sending it, making message review and debugging easier during development.

Cucumber step definitions can map natural-language destinations to Rails route helpers, including list, new, edit, and record lookup paths.

High-level MV* JavaScript frameworks reduce DOM boilerplate with client-side rendering, routing, and data binding, but choosing between Backbone, Ember, and Knockout depends on style and needs.

Adds String#indent for padding each line, including blank lines, without introducing trailing whitespace and with optional custom indentation characters.

Link related cards directly from the editor by searching for a card and inserting a Markdown link into the text area.

Add code blocks without indentation using triple backticks, matching GitHub-style fenced code blocks for easier formatting in plain text and Markdown.

Capistrano can check out code on the target server using SSH agent forwarding instead of a separate repository key. ssh_options[:forward_agent] = true enables this, but it should be used with caution.