foo.rb

  def work_weeks_for_date_range(date_range)
    {}.tap do |result|
      date_range.each do |date|
        result.store(date, WorkWeek.where(user_id: id, cweek: date.cweek, year: date.year, project_id: projects.for_company(current_company_id).map(&:id)))
      end
    end
  end