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: category_indexing.rb
    path of file: ./repos/picky/server/lib/picky
    
    the code of the file until where you have to start completion: module Picky

  #
  #
  class Category

    include Helpers::Indexing

    attr_reader :exact,
                :partial

    # In
    
    def prepare scheduler = Scheduler.new
      categories = Categories.new
      categories << self
      with_data_snapshot do
        scheduler.schedule do
          indexer.prepare categories, scheduler
          nil # Note: Needed so procrastinate is happy.
        end
      end
    end