D3_Rails is a small, lightweight gem which allows you to include any and all of D3 Javascripts into your 3.1 Rails application, merely by including any desired D3 files into your application.js manifest.

D3 is a small, free JavaScript library for manipulating HTML documents based on data. D3 can help you quickly visualize your data as HTML or SVG, handle interactivity, and incorporate smooth transitions and staged animations into your pages. You can use D3 as a visualization framework (like Protovis), or you can use it to build dynamic pages (like jQuery).

d3.js
d3.min.js

This gem should work out of the box. All you have to do is add the gem to your Gemfile:

gem 'd3_rails'

Then bundle install or update (depending on if you want to upgrade an older version of this gem).

bundle install
bundle update

For use with the asset pipeline, you can include the d3 javascript in your rails application by merely including the following line in your application.js manifest

//= require jquery
.
.
//= require d3

Version numbers of this gem have been changed as of 2-2-2012 to reflect the d3 version numbers.

As of version 3.0.0, the extraneous files from legacy version of d3 have been removed.