A simple class wrapping a calendar week

calendar_week.rb

class CalendarWeek
  attr_reader :week, :year, :date
  private :date

  def self.current
    for_date(Date.today)
  end

  def self.for_date(date)
    new(date.year, date.cweek)
  end

  def initialize(year, week)
    @year, @week = year, week
    @date = Date.commercial(year, week)
  end

  def start
    @date.beginning_of_week
  end

  def end
    @date.end_of_week
  end

  def next
    date_next_week = (date + 1.week).end_of_week
    self.class.new(date_next_week.year, date_next_week.cweek)
  end

  def previous
    date_previous_week = (date - 1.week).end_of_week
    self.class.new(date_previous_week.year, date_previous_week.cweek)
  end

  def to_param
    "#{year}-#{week}"
  end
end