If you are testing using Test:Unit (rather than RSpec) and you're using Ruby 1.9.* colorized output of your tests using Autotest will not be immediately available. Since, 1.9 comes with mini test the test/unit/ui/console/testrunner.rb script is not loaded...

Using CSS positioning it's possible to offset an element and collapse its width and height where it would normally appear. Wrapping the content in an absolute positioned element, the space that the element would normally take up is collapsed. <div st...

If you're running Rails in production it will by default be configured to let apache or nginx send files for you. If you're handling file downloads yourself with send_file send_file("path/to/file.txt") you will notice that the downloaded files are empty...

If you use the Paypal sandbox you'll notice that there is an IPN Simulator test tool. You must be logged to use it. This tool lets you test an IPN handler script for your application. If your script is not correct and you try to send a test IPN transactio...

Is your app connected to the internet? You can use this standalone class to check! There are no dependencies so you can copy/paste it into your project without needing to install another framework. With this class it's as simple as running `Reachabili...