panel/app/models/metadata_has_one.rb

# frozen_string_literal: true

class MetadataHasOne < MetadataHasMany
  def had_one
    return default_value if value_was.blank?

    posts.find(uuid: value)
  end

  def has_one
    return default_value if value.blank?

    posts.find(uuid: value)
  end

  def had_many; end
  def has_many; end

  def save
    super

    return true unless changed?
    return true unless inverse?

    had_one&.value = nil
    has_one&.value = post.uuid.value

    true
  end

  def related_methods
    @related_methods ||= %i[has_one had_one].freeze
  end
end