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: recommended_articles_lists_controller.rb
    path of file: ./repos/forem/app/controllers/api/v1
    
    the code of the file until where you have to start completion: module Api
  module V1
    class RecommendedArticlesListsController < ApiController
      before_action :authent
    
      def create
        # Actually uspert than a pure create
        # We upsert by user_id and placement_area
        # In the future we may want to allow multiple lists per user and placement_area,
        # and we will use a special param for that.
        @recommended_articles_list = RecommendedArticlesList.where(
          user_id: permitted_params[:user_id],
          placement_area: permitted_params[:placement_area],
        ).first_or_initialize
        @recommended_articles_list.assign_attributes(permitted_params)
        @recommended_articles_list.save!
        render json: @recommended_articles_list, status: :created
      end