房间预订系统查询

Question

我有以下关联

User:   
  has_many :reservations
  has_many :rooms, through: :reservations
Room:
  has_many :reservations
  has_many :users, through: :reservations
Reservation:
  belongs_to :room
  belongs_to :user

在我的预订模型中，我有以下字段

  

checkin_date，checkout_date

我想找出在给定时间内尚未保留的所有房间。

我写了以下查询，但它没有用。请建议更正或更好的方式。

    Room.joins('LEFT JOIN reservations ON reservations.room_id = rooms.id').where.not(
       'reservations.checkin_at < :requested_end_date AND 
        reservations.checkout_at > :requested_start_date', 
        requested_start_date: date_begin, 
        requested_end_date: date_end
    )    

Answer 1

解决方案

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Answer 2

也许......

Room.joins('left join reservations on reservations.room_id = rooms.id')
           .where('reservations.checkin_at > ? AND reservations.checkout_at < ?', date_begin, date_end)
           .where('reservations.room_id IS NULL')