# One Yjs update of a document -- an edit by someone, or a compacted state
# that replaces many earlier updates. Order doesn't matter to Yjs.
class DocumentUpdate < ApplicationRecord
  MAX_BYTES = 10.megabytes

  belongs_to :document
  belongs_to :user, optional: true

  validates :data, presence: true
  validate { errors.add(:data, "ist zu groß") if data && data.bytesize > MAX_BYTES }

  def as_message = { id:, data: Base64.strict_encode64(data) }
end