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Add possibility to rerate #23

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Add possibility to rerate #23

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fe71481
Adding possible to rate again (overwriting old rating)
robban Mar 22, 2013
543224f
Fixed bug for when ratingcache does not exist.
robban Mar 22, 2013
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29 changes: 11 additions & 18 deletions lib/letsrate/model.rb
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Original file line number Diff line number Diff line change
Expand Up @@ -8,29 +8,22 @@ def rate(stars, user_id, dimension=nil)
r.stars = stars
r.rater_id = user_id
r.save!
end
update_rate_average(stars, dimension)
end
else
raise "User has already rated."
previous_rate = rates(dimension).where(:rater_id => user_id).first
previous_rate.stars = stars
previous_rate.save!
end
update_rate_average(stars, dimension)
end

def update_rate_average(stars, dimension=nil)
if average(dimension).nil?
RatingCache.create do |avg|
avg.cacheable_id = self.id
avg.cacheable_type = self.class.name
avg.avg = stars
avg.qty = 1
avg.dimension = dimension
avg.save!
end
else
a = average(dimension)
a.avg = (a.avg*a.qty + stars) / (a.qty+1)
a.qty = a.qty + 1
a.save!
end
rating_cache_properties = {:cacheable_id => self.id,:cacheable_type => self.class.name,:dimension => dimension}
rating_cache = RatingCache.where(rating_cache_properties).first || RatingCache.new(rating_cache_properties)
all_rates = Rate.where(:rateable_id => self.id, :rateable_type => self.class.name, :dimension => dimension)
rating_cache.qty = all_rates.count
rating_cache.avg = all_rates.map(&:stars).sum.to_f / rating_cache.qty
rating_cache.save!
end

def average(dimension=nil)
Expand Down