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: plugin.rb
    path of file: ./repos/refinerycms/core/lib/refinery
    
    the code of the file until where you have to start completion: module Refinery
  class Plugin

    at
    
    def url
      @url ||= build_url

      if @url.is_a?(Hash)
        { only_path: true }.merge(@url)
      elsif @url.respond_to?(:call)
        @url.call
      else
        @url
      end