You might want to implement counter_cache to store these values instead
of calculating them each time.
See
http://www.rubyonrails.org/api/classes/ActiveRecord/Associations/ClassMethods.html.
You might want to implement counter_cache to store these values instead
of calculating them each time.
See
http://www.rubyonrails.org/api/classes/ActiveRecord/Associations/ClassMethods.html.
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