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# frozen_string_literal: true
require_dependency "renalware/patients"
module Renalware
module Patients
# Calculates a patients age. Takes into account:
# - if they have a died_on date, in which case their age never changes
# - which side of 'today' their birthday (e.g. May 11) falls, to make sure
# their age is for example only 99 and not 100 when their birthday is 100 years ago tomorrow,
# and 100 when its is 100 years ago today or yesterday.
#
# Example usage:
#
# CalculateAge.for(patient) #=> 99
#
class CalculateAge
pattr_initialize :patient
delegate :born_on, :died_on, to: :patient
def self.for(patient)
new(patient).call
end
def call
return if born_on.blank?
age = relative_date.year - born_on.year
age -= 1 if relative_date < (born_on + age.years) # for days before birthday
age
end
private
# Returns the effective date to measure up until, which will be their died_on if the patient
# has one, otherwise today.
def relative_date
died_on || today
end
def today
Time.now.utc.to_date
end
end
end
end
Version data entries
10 entries across 10 versions & 1 rubygems