worker_definition.rb

# Note that if any data required to determine the type of person is missing then person type = :missing
if [study_type, employment_status, other_activity].all? { |e| e == :missing }
  :missing
elsif study_type == :primary_school
  :primary_school
elsif study_type == :secondary_school
  :secondary_school
elsif employment_status == :full_time
  if study_type == :no_study || study_type == :missing
    white_or_blue == :white ? :full_time_white_collar_worker : :full_time_blue_collar_worker
  else
    white_or_blue == :white ? :full_time_white_worker_and_any_tertiary : :full_time_blue_worker_and_any_tertiary
  end
elsif employment_status == :part_time_or_casual
  if study_type == :no_study || study_type == :missing
    white_or_blue == :white ? :part_time_white_collar_worker : :part_time_blue_collar_worker
  else
    white_or_blue == :white ? :part_time_white_worker_and_any_tertiary : :part_time_blue_worker_and_any_tertiary
  end
elsif study_type == :full_time_tertiary
  :full_time_tertiary
elsif [:part_time_tertiary, :other_study].include?(study_type)
  :part_time_tertiary
elsif [:not_yet_at_school, :unemployed, :home_duties, :retired].include?(other_activity)
  other_activity
else
  :other
end