Timesheet#human_readable_billable_time

human_readable_time.rb

def human_readable_billable_time
  billable_entries_by_rate_type = entries.select(&:billable?).group_by(&:rate_type)

  human_readable_time_string = billable_entries_by_rate_type.map do |type, entries|
    "#{entries.map(&:amount).sum} #{type == "weekly" ? 'days' : 'hours'}"
  end.join(" + ")

  human_readable_time_string.empty? ? "No billable time" : human_readable_time_string
end