ensl.org/lib/plugins/acts_as_rateable/README

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Acts As Rateble
=============
Acts_as_rateable is a plugin released under the MIT license.
It makes activerecord models rateable through a polymorphic association and optionally logs which user rated which model.
In this case, one user can rate an object once. Used on cotcot.hu for article rating, sponsored quizzes, etc.
Example
=======
Install the plugin into your vendor/plugins directory, insert 'acts_as_rateable' into your model, then restart your application.
class Post < ActiveRecord::Base
acts_as_rateable
end
Now your model is extended by the plugin, you can rate it ( 1-# )or calculate the average rating.
@post.rate_it( 4, current_user.id )
@post.average_rating #=> 4.0
@post.average_rating_round #=> 4
@post.average_rating_percent #=> 80
@post.rated_by?( current_user ) #=> rating || false
Post.find_average_of( 4 ) #=> array of posts
See acts_as_rateable.rb for further details!
# Notes
Jinzhu - generator is compatible with rails 3.
Copyright (c) 2007-2010 Ferenc Fekete, http://feketeferenc.hu , released under the MIT license