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: path_to.rb
    path of file: ./repos/rack-app/lib/rack/app/instance_methods
    
    the code of the file until where you have to start completion: # frozen_string_literal: true
module Rack::App::InstanceMethods::PathTo
  def path_to(defined_path, options = {})
    app_class = options[:class] || self.class

    query_string_hash = options[:params] || {}
    options.ea
    
  def path_to(defined_path, options = {})
    app_class = options[:class] || self.class

    query_string_hash = options[:params] || {}
    options.each do |k, v|
      k.is_a?(String) && query_string_hash[k] = v
    end

    router = request.env[Rack::App::Constants::ENV::ROUTER]
    final_path = router.path_to(app_class, defined_path)

    path_keys = final_path.scan(/:(\w+)/).flatten

    path_keys.each do |key|
      value = query_string_hash.delete(key) || params[key] || raise("missing path-key value for #{key}!")
      final_path.gsub!(/:#{key}/, value.to_s)
    end

    unless query_string_hash.empty?
      final_path.concat("?" + Rack::Utils.build_nested_query(query_string_hash))
    end