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: readinglist_controller.rb
    path of file: ./repos/forem/app/controllers/concerns/api
    
    the code of the file until where you have to start completion: module Api
  module ReadinglistController
    extend ActiveSupport::Concern

    INDEX_REACTIONS_ATTRIBUTES_FOR_SERIALIZATION = %i[id reactable_id created_at status].freeze
    private_constant :INDEX_REACTIONS_ATTRIBUTES_FOR_SERIALIZATION

    PER_PAGE_MAX = 100
    private_constant :PER_PAGE_MAX

    def index
      per_page = (params[:per_page] || 30).to_i
      num = [per_page, PER_PAGE_MAX].min

      @readinglist = Reaction
        .select(INDEX_REACTIONS_ATTRIBUTES_FOR_SERIALIZATION)
        .readinglist
        .where(user_id: @user.id)
        .where.not(status: "archived")
        .order(created_at: :desc)
        .page(params[:page])
        .per(num)

      articles = Article
        .includes(:organization)
        .select(ArticlesCo
    
    def index
      per_page = (params[:per_page] || 30).to_i
      num = [per_page, PER_PAGE_MAX].min

      @readinglist = Reaction
        .select(INDEX_REACTIONS_ATTRIBUTES_FOR_SERIALIZATION)
        .readinglist
        .where(user_id: @user.id)
        .where.not(status: "archived")
        .order(created_at: :desc)
        .page(params[:page])
        .per(num)

      articles = Article
        .includes(:organization)
        .select(ArticlesController::INDEX_ATTRIBUTES_FOR_SERIALIZATION)
        .where(id: @readinglist.map(&:reactable_id))
        .decorate

      @users_by_id = User
        .joins(:profile)
        .select(UsersController::SHOW_ATTRIBUTES_FOR_SERIALIZATION)
        .find(articles.map(&:user_id))
        .index_by(&:id)

      articles_by_id = articles.index_by(&:id)

      @articles_by_reaction_ids = @readinglist.each_with_object({}) do |reaction, result|
        result[reaction.id] = articles_by_id[reaction.reactable_id]
      end
    end