core/app/models/gaku/external_school_record.rb
module Gaku
class ExternalSchoolRecord < ActiveRecord::Base
belongs_to :school
belongs_to :student, counter_cache: :external_school_records_count
validates :school, :student, presence: true
def attendance_rate
(presence_days.to_f / total_units) * 100 if units_values_present?
end
def presence_days
total_units - units_absent if units_values_present?
end
private
def units_values_present?
units_absent.present? && total_units.present?
end
end
end