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module My
module Nested
module Remixable
module Rating
def self.included(base)
base.extend ClassMethods
end
include DataMapper::Resource
is :remixable
# properties
property :id, Integer, :serial => true
property :user_id, Integer, :nullable => false
property :rating, Integer, :nullable => false, :default => 0
module ClassMethods
# total rating for all rateable instances of this type
def total_rating
rating_sum = self.sum(:rating).to_f
rating_count = self.count.to_f
rating_count > 0 ? rating_sum / rating_count : 0
end
end
end
end
end
end
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