class PostVersion < ApplicationRecord
  include VersionRecord

  scope :with_previous_version, -> {
    joins('LEFT JOIN post_versions prev ON prev.post_id = post_versions.post_id ' +
          'AND prev.version_no = post_versions.version_no - 1')
  }

  belongs_to :post
  belongs_to :parent, class_name: 'Post', optional: true

  validates :url, presence: true
  validates :video_ms, numericality: { only_integer: true, greater_than: 0 }, allow_nil: true

  validate :validate_original_created_range

  private

  def validate_original_created_range
    f = original_created_from
    b = original_created_before
    return if f.blank? || b.blank?

    if f >= b
      errors.add :original_created_before, 'オリジナルの作成日時の順番がをかしぃです．'
    end
  end
end