has_many relationships

gistfile1.rb

class Student < ActiveRecord::Base
  has_many :rating
  has_many :books, :through => :ratings
end

class Book < ActiveRecord::Base
  has_many :ratings
  has_many :students, :through => :ratings
end

class Rating < ActionRecord::Base
  belongs_to :book
  belongs_to :student
  
  # Schema would be like this
  # id            :integer
  # book_id       :integer
  # student_id    :integer
  # vote          :boolean ( DEFAULT = NULL )
end

@student.books.find(:all, :condition => ["ratings.vote", true]) #find books student loves 
@student.books.find(:all, :condition => ["ratings.vote", false]) #find books student hates