module MetadataControllerSupport
  extend ActiveSupport::Concern

  included do
    after_action :set_creator_metadata, only: :create
    after_action :set_modifier_metadata, only: :update
  end

  def user_for_metadata
    current_user ? current_user.username : ''
  end

  def set_creator_metadata
    if resource.valid?
      resource.try(:set_metadata!, :creator_username, user_for_metadata)
      resource.try(:set_metadata!, :modifier_username, user_for_metadata)
    end
  end

  def set_modifier_metadata
    _resource = @resources || [resource]
    _resource.flatten.each do |r|
      r.try(:set_metadata!, :modifier_username, user_for_metadata) if r.valid?
    end
  end
end