ruby-on-rails - Rails 验证日期范围的唯一性

Question

我有一个涉及员工缺勤记录的应用程序。

我需要确保每条记录的开始日期和结束日期不重叠。

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，则不应以任何方式输入该日期范围内的另一个记录。所以我不能让一个从今天开始，然后在后天或任何更晚的日期结束。

简单地说，我需要使日期范围唯一。

实现这一目标的最佳方法是什么？

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这个问题的 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:/

谢谢你的时间!

编辑:

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

Answer 1

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