url_for accepts only one argument, so extra query parameters fail. polymorphic_url builds the same link and keeps additional params.

ActiveRecord::MissingAttributeError appears when a query omits a column later accessed on the model, often after using select with too few fields.

Create JavaScript charts from Ruby with a single line while keeping data local instead of sending it to Google.

jQuery plugin for dynamically adding and removing ActiveRecord nested records in forms, simplifying repeated input for parent-child data.

Basecamp stays fast with little JavaScript by combining server-rendered pages, PJAX, and Russian doll caching to reduce client-side work.

Sometimes you inherit a non Rails or non Rack based web app such as PHP, Perl, Java / JEE, etc. I like using cucumber for functional testing so I put together this project structure to use as a starting point for testing non Ruby web based applications.

delocalize provides localized date/time and number parsing functionality for Rails.

Prototype

Ruby

Rails

Any gem

Or, you can test your Rack application (or Sinatra, or Rails, or Merb) using arbitrary HTTP client libraries, to check interoperability.

Rfm brings your FileMaker data to Ruby with elegance and speed. Now your Ruby scripts and Rails applications can talk directly to your FileMaker server with a syntax that just feels right.

In a nutshell, Bowline lets you build cross platform desktop applications with Ruby, HTML and JavaScript. The idea is to make building desktop apps as simple (and fun) as building Rails websites.

The Holy Grail of testing for front-end development; execute browser-less, console-based, javascript + DOM code right from within your Rails test suite.