RSpec’s nested documentation format prints example descriptions while specs run, making warnings and failures visible immediately and giving a quick view of core behavior.

Large Sass files delay the first request after edits because CSS is compiled on demand; watching files and compiling ahead of time removes the startup lag.

Clear MySQL data without dropping tables, useful after bad migrations or frozen tests. DatabaseCleaner truncation keeps the schema intact and can be wrapped in a Rake task.

Selenium actions can return before a page finishes loading, so Ruby updates may race with browser-side changes. A Capybara resynchronization step prevents flaky Cucumber features.

Around the time in my life when I stopped ordering drinks made with more than one ingredient, I was woken up for the last time by a hypochondriac Nagios monitoring installation. If you are on-call long enough, you cultivate a violent reaction to the sound of your cell phone's text message alert. If your monitoring is overconfigured, that reaction boils over hastily, as it will interrupt you during meals, sex, sleep — all of the basics — with the excruciating operational details of your web site.

I've since developed, with the help of some n...

Adds a slide out panel to your Rails application that directs clients to test stories that have been marked as 'delivered' in Pivotal Tracker.

Changing an association and its foreign key on the same ActiveRecord object can lose the later assignment; the association value wins on save.

Quoted Sass mixin arguments can produce invalid CSS for multi-part values like box-shadow. unquote removes the quotes so generated properties stay valid.

Range#include? becomes slow for non-numeric ranges in Ruby 1.9, while Range#cover? is unavailable in 1.8.7. A compatibility method keeps one check working across both versions.

RubyGems 1.6 can break Capistrano by activating incompatible net-ssh versions; isolating Capistrano in a dedicated Bundler Gemfile restores deployment commands.

Pivotal Tracker supports keyboard shortcuts for quick navigation, search, help, story creation, and toggling backlog, charts, current, done, history, icebox, my work, and labels.

RubyGems 1.6.0 can break Rails 2.x with ActiveSupport::Dependencies::Mutex NameError during startup; loading thread before boot.rb prevents the failure.

Wallaby converts artwork and animation from Adobe Flash Professional FLA files into HTML for wider reach on devices without Flash runtime support.

Distinguish between a simple attribute and an associated object in Person; reflect_on_association lets code branch when a getter refers to a relation.

If you want to get a deep understanding of how closures, blocks, procs & lambdas in Ruby work, check out the code at the attached link.

Here the summary:

^
---------------------------- Section 6: Summary ----------------------------

 So, what's the final verdict on those 7 closure-like entities?          

                                                     "return" returns from closure
                                    True closure?    or declaring context...?         Arity check?
                         ...

MIN() and MAX() aggregate across rows, not within one row; LEAST() and GREATEST() return the smaller or larger value for the current row.

Currently, only up to 500 rows of Analytics table data can be exported at a time into CSV format. If you need to export larger data sets, like exporting all keywords that sent traffic to your site, you can export multiple times as long as each batch contains at maximum 500 rows.

If you have thousands of rows that require multiple exports, you can use the convenient workaround below to export all your rows in one go.

Dual-monitor setups with NVIDIA on Linux can crash X when DDC/CI is enabled on Dell displays; disabling DDC/CI avoids the failure.

Rails form fields can clash when the same form is rendered multiple times; a prefix keeps field IDs unique without changing submitted names.

Flash movies can exchange data with JavaScript in the same page, with ExternalInterface as the preferred bridge and fscommand or SetVariable() as legacy options.

Typing en-dashes, em-dashes, and other symbols is awkward without a compose key. A configured compose key enables cross-application input of special characters on Linux.

A while ago we were working on an application that had an entire version specially created for mobiles, such as the iPhone. This specific application was entirely tested with Capybara, Steak and Selenium Webdriver. Although the test suite wasn’t the fastest one in the world, the web application was very well tested, and to guarantee that we would also be testing the mobile version, we would have to simulate an iPhone user agent accessing the application.

But wait, you might be thinking that we are not able to change browser headers while ...

Paperclip supports ImageMagick resize flags for scaling, cropping, and fitting images to specific dimensions without distorting them.