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module RailsConnector
#
# This module provides a mixin for the CMS object model. It provides a +ratings+ association and well as several helper methods.
module Rateable
# returns all Ratings for this Obj.
def ratings
Rating.where(:obj_id => id)
end
# Creates/updates the rating for a CMS object.
def rate(score)
rating = ratings.find_by_score(score) || ratings.build(:score => score)
rating.count += 1
rating.save
end
# Returns a count for the particular score for a CMS object.
def count_for_score(score)
rating = ratings.find_by_score(score)
rating ? rating.count : 0
end
# Determines if a CMS object has already been rated.
def rated?
!ratings.empty?
end
# Calculates the average rating for a CMS object.
def average_rating
raise TypeError unless rated?
sum, count = ratings.inject([0, 0]) do |(sum, count), rating|
[sum + rating.score * rating.count, count + rating.count]
end
sum.to_f / count.to_f
end
# Calculates the average rating for a CMS object in per cent.
def average_rating_in_percent
if rated?
(100 * average_rating / Rating::MAXIMUM).to_i
else
0
end
end
# Resets the ratings for a CMS object.
def reset_rating
ratings.destroy_all
end
# Redefine this method in your application's <tt>obj_extensions.rb</tt> in order to define conditions for allowing a CMS object to be rated.
def allow_rating?; true; end
# Redefine this method in your application's <tt>obj_extensions.rb</tt> in order to define conditions for allowing a CMS object to be rated anonymously.
def allow_anonymous_rating?; true; end
end
end
Version data entries
21 entries across 21 versions & 1 rubygems