ruby-on-rails – 识别在rails中创建的冲突日期

发布时间：2020-12-16 23:29:42 所属栏目：百科来源：网络整理

导读：预订应用程序.如何检查或验证日期,例如date_start和date_end的值为 date_start date_end 26-11-2017 27-11-2017 我将创建另一个具有这些起始和结束日期值的保留,但它与其他值冲突.如何查看有冲突的日期？ date_start date_end 25-11-2017 28-11-2017 用它来

预订应用程序.如何检查或验证日期,例如date_start和date_end的值为

date_start  date_end 
26-11-2017  27-11-2017

我将创建另一个具有这些起始和结束日期值的保留,但它与其他值冲突.如何查看有冲突的日期？

date_start  date_end 
25-11-2017  28-11-2017

用它来验证两者之间的日期

模型

validate :no_reservation_overlap

scope :overlapping,->(period_start,period_end) do
  where "((date_start <= ?) and (date_end >= ?))",period_end,period_start
end

private

def no_reservation_overlap
  if (Reservation.overlapping(date_start,date_end).any?)
     errors.add(:date_end,'it overlaps another reservation')
  end
end

查看 – 选择日期

<%= f.label :'date_start:' %>
<%= f.date_field :date_start %>

<%= f.label :'date_end:' %>
<%= f.date_field :date_end %>

样本日期26到27已经预订/保留,据说它必须防止插入25到28,因为已经预订了26到27.

解决方法

模型：

class Reservation < ApplicationRecord
    validate :overlapping
    private
    def overlapping
    if Reservation.where('? <  date_end and ? > date_start',self.date_start,self.date_end).any?
        errors.add(:date_end,'it overlaps another')
    end
end

架构：

    create_table "reservations",force: :cascade do |t|
        t.date     "date_start"
        t.date     "date_end"
        t.datetime "created_at",null: false
        t.datetime "updated_at",null: false
    end

这是我尝试创建(24 nov – 27 nov)和(25 nov – 27 nov)时有轨道控制台日志(25 nov – 26 nov)

irb(main):003:0> Reservation.create date_start: Date.parse('25-11-2017'),date_end: Date.parse('26-11-2017')
   (0.2ms)  BEGIN
   (0.6ms)  SELECT COUNT(*) FROM "reservations" WHERE ('2017-11-25'  date_start)
  SQL (0.6ms)  INSERT INTO "reservations" ("date_start","date_end","created_at","updated_at") VALUES ($1,$2,$3,$4) RETURNING "id"  [["date_start","2017-11-25"],["date_end","2017-11-26"],["created_at","2017-11-21 13:23:05.192276"],["updated_at","2017-11-21 13:23:05.192276"]]
   (10.7ms)  COMMIT
=> #
irb(main):004:0> Reservation.create date_start: Date.parse('24-11-2017'),date_end: Date.parse('27-11-2017')
   (0.1ms)  BEGIN
   (0.2ms)  SELECT COUNT(*) FROM "reservations" WHERE ('2017-11-24'  date_start)
   (0.2ms)  ROLLBACK
=> #
irb(main):005:0> Reservation.create date_start: Date.parse('25-11-2017'),date_end: Date.parse('26-11-2017')
   (0.1ms)  BEGIN
   (0.3ms)  SELECT COUNT(*) FROM "reservations" WHERE ('2017-11-25'  date_start)
   (0.1ms)  ROLLBACK
=> #

有预期的回滚.

（编辑：李大同）

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