检查时间之间的重叠答案

【问题标题】：Checking overlaps between times检查时间之间的重叠
【发布时间】：2016-08-10 11:45:32
【问题描述】：

我尝试创建检查时间重叠的验证。

  scope :overlapping_activity, ->(activity) { where("(start_on, end_on) OVERLAPS (?, ?)",
                                              activity.start_on, activity.end_on }
  validate :not_overlapping_activity

  def not_overlapping_activity
    if Activity.overlapping_activity(self).any?
      errors.add(:base, "Zajęcie w tym okresie koliduje z innymi.")
    end
  end

错误：

ERROR:  function pg_catalog.overlaps(time without time zone, time without time zone, unknown, unknown) is not unique
LINE 1: ...NT(*) FROM "activities" WHERE ((start_on, end_on) OVERLAPS (...

我找到了这个主题：Rails 3.1: Querying Postgres for records within a time range，但我无法在我的解决方案中使用它。当我尝试在范围内添加时间戳时，它显示了另一个语法错误。有人可以告诉我如何正确解决我的问题吗？

我如何尝试使用时间戳：

  scope :overlapping_activity, ->(activity) { where("(start_on::timestamp, end_on::timestamp) OVERLAPS (?, ?)",
                                              timestamp activity.start_on, timestamp activity.end_on) }

【问题讨论】：

你能试试`scope :overlapping_activity, ->(activity) { where("(start_on::timestamp, end_on::timestamp) OVERLAPS (timestamp :start_on, timestamp :end_on)", :start_on => activity.start_on, :end_on => activity.end_on) }` ?
@IVOGELOV 现在出错了：ERROR: cannot cast type time without time zone to timestamp without time zone
您确定activity.start_on 和activity.end_on 包含日期而不仅仅是时间吗？
@IVOGELOV 正如我在帖子标题中所写的那样，只有时间。在 PostgreSQL 数据库中，列是没有时区的时间
OVERLAPS 要求所有 4 个参数的类型均为 TIMESTAMP - 日期加时间。如果您无法将时间转换为时间戳（添加任何日期，但所有 4 个参数的日期相同） - 那么您唯一的选择是将所有 4 次转换为秒（使用 extract (epoch from t::interval) 并使用此公式检查重叠 @ 987654330@

标签： ruby-on-rails ruby overlap

【解决方案1】：

我通过这种方法实现了我想要的：

validate :not_overlapping_activity

    def not_overlapping_activity
      overlapping_activity = Activity.where(day_of_week: day_of_week)
                                     .where(pool_zone: pool_zone)
      overlapping_activity.each do |oa|
        if (start_on...end_on).overlaps?(oa.start_on...oa.end_on)
          errors.add(:base, 'In this period of time there is some activity.')
        end
      end
    end

如果有人有更好的解决方案，请写。我想变得更好更聪明:)

【讨论】：