gistfile1.txt

a = {}
    Day.all.map do |day|
      a.merge!({day.date => []})
      day.user_schedules.group(:user_id).count.each do |us|
        if us[1] > 1
          day.user_schedules.where("user_id = ?", us[0]).each do |uss|
            if User.find(us[0]).department_blocks
              .where(
                "department_blocks.id != ?", uss.department_block.id
              )
              .where(
                day_id: day.id
              ).where(
                overlaps_criteria_for_user_schedules(uss.department_block)
              ).exists?
                a[day.date] << us[0] if a[day.date].last != us[0]
            end
          end
        end
      end
    end