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: items_controller.rb
    path of file: ./repos/coursemology2/app/controllers/course/lesson_plan
    
    the code of the file until where you have to start completion: # frozen_string_literal: tr
    
  def render_json_response
    @items = @items.with_actable_types(@item_settings.actable_hash).
             preload(:actable).
             with_reference_times_for(current_course_user, current_course).
             with_personal_times_for(current_course_user).
             select { |item| can?(:show, item.actable) }

    @milestones = current_course.lesson_plan_items.where(actable_type: Course::LessonPlan::Milestone.name).
                  preload(:actable).ordered_by_date.
                  with_reference_times_for(current_course_user, current_course).
                  with_personal_times_for(current_course_user).
                  map(&:actable)

    @folder_loader = Course::Material::PreloadService.new(current_course)

    assessment_tabs_titles_hash
    visibility_hash
    render 'index'
  end