#14 Performing Calculations on Models
Apr 04, 2007 | 2 minutes | Active Record
Did you know ActiveRecord provides class methods for performing calculations on models? You can even use these methods through associations.
ruby
Task.sum(:priority) Task.sum(:priority, :conditions => 'complete=0') Task.maximum(:priority) Task.minimum(:priority) Task.average(:priority) p = Project.find(:first) p.tasks.sum(:priority) p.tasks.sum(:priority, :conditions => 'complete=0')
