识别在rails中创建的冲突日期

Question

预订应用程序.如何检查或验证日期,例如date_start,date_end具有值

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.

Answer 1

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
    结尾

这是rails console我尝试创建 (24 nov - 27 nov) 和 (25 nov - 27 nov) 之后的日志 (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) 开始
   (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) 提交
=> #
irb(main):004:0> Reservation.create date_start: Date.parse('24-11-2017'), date_end: Date.parse('27-11-2017')
   (0.1ms) 开始
   (0.2ms) SELECT COUNT(*) FROM "reservations" WHERE ('2017-11-24' date_start)
   (0.2ms) 回滚
=> #
irb(main):005:0> Reservation.create date_start: Date.parse('25-11-2017'), date_end: Date.parse('26-11-2017')
   (0.1ms) 开始
   (0.3ms) SELECT COUNT(*) FROM "reservations" WHERE ('2017-11-25' date_start)
   (0.1ms) 回滚
=> #

正如预期的那样有回滚。