Install in Rails 3

Instructions

In you Gemfile add:
gem 'ajaxful_rating' , '>= 3.0.0.beta7'

Now, install new gem:
bundle install

Generate

rails g ajaxful_rating UserModelName

The generator takes one argument: UserModelName, which is the name of your current user model. This is necessary to link both the rate and user models.

Also this generator copies the necesary images, styles, etc.