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class CohortEntity < Grape::Entity include ActionView::Helpers::NumberHelper expose :registration_month do |cohort| cohort[:registration_month].strftime('%b %Y') end expose :total do |cohort| number_with_delimiter(cohort[:total]) end expose :inactive do |cohort| number_with_delimiter(cohort[:inactive]) end expose :activity_months, using: CohortActivityMonthEntity end