Rails 验证日期范围的唯一性 [英] Rails validate uniqueness of date ranges

问题描述

我有一个涉及员工缺勤记录的应用程序.

I have an application that involves absence records for employees.

我需要确保每条记录的开始日期和结束日期不重叠.

I need to ensure that the start and end dates for each record don't overlap.

因此，例如，如果我输入了从今天开始到明天结束的缺勤记录，则应该无法以任何方式输入该日期范围内的另一个记录.因此，我无法制作从前一天开始，然后在后天或任何更晚日期结束的内容.

So for example, if I entered an absence record that started today and ended tomorrow, it shouldn't be possible to enter another inside of that date range in any way. So I couldn't make one that starts the day before today, then ends the day after tomorrow, or any later date.

简单地说，我需要使日期范围唯一.

To put it simply, I need to make the date range unique.

实现这一目标的最佳方法是什么?

What is the best way to achieve this?

模型类中涉及遍历所有记录的自定义验证器需要很长时间才能完成，而且我还没有找到任何解决此问题的 gem.我也没有找到任何简单的方法来通过模型中的唯一性来确定范围.我很难过:/

Custom validators in the model class that involve iterating through all records take far too long to complete, and I haven't found any gems that address this problem. I also haven't found any simply way to scope by uniqueness in the model either. I'm stumped :/

感谢您的时间！

class Absence < ActiveRecord::Base
attr_accessible :date, :date_ended, :status, :reason, :form, :user_id, :tempuser, :company_id
belongs_to :user
default_scope { where(company_id: Company.current_id) }

validates :date, :date_ended, :status, :reason, :form, :user_id, presence: true 
validates_numericality_of :user_id, :only_integer => true, :message => "can only be whole number."
end

推荐答案

我使用这些:

  scope :overlaps, ->(start_date, end_date) do
    where "(DATEDIFF(start_date, ?) * DATEDIFF(?, end_date)) >= 0", end_date, start_date
  end

  def overlaps?
    overlaps.exists?
  end

  # Others are models to be compared with your current model
  # you can get these with a where for example
  def overlaps
    siblings.overlaps start_date, end_date
  end

  validate :not_overlap

  def not_overlap
    errors.add(:key, 'message') if overlaps?
  end

  # -1 is when you have a nil id, so you will get all persisted user absences
  # I think -1 could be omitted, but did not work for me, as far as I remember
  def siblings
    user.absences.where('id != ?', id || -1)
  end

来源:https://makandracards.com/makandra/984-test-if-two-date-ranges-overlap-in-ruby-or-rails

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