You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: discussion_type.rb
    path of file: ./repos/gitlabhq/app/graphql/types/notes
    
    the code of the file until where you have to start completion: # frozen_string_literal: true

module Types
  module No
    
      def noteable
        noteable = object.noteable

        return unless Ability.allowed?(context[:current_user], :"read_#{noteable.to_ability_name}", noteable)

        noteable
      end