Inspect Objects in Rails Using PP

This

<%= debug @freebox %>

brings

--- !ruby/object:Freebox 
attributes: 
  name: Shiny Skateboards
  home_page: 
  country: USA
  id: "1"
  street_and_house: Everyone's Lane
  phone: "36365"
  user_id: "1"
  opening_hours: Mon-Fri 10am-8pm, Sat 10am-6pm
  city_and_zip: Detroit
  state: Michigan

That's OK, but the format is different than what I'm used to, and nil is not shown. So in config/environments/development.rb I added require 'pp', and in app/helpers/application_helper.rb I have

def pp_debug(obj)
  '<pre>' +
  h(obj.pretty_inspect) +
  '</pre>'
end

Now, this

<%= pp_debug @freebox %>

brings

#<Freebox:0x410347c4
 @attributes=
  {"name"=>"Shiny Skateboards",
   "home_page"=>nil,
   "country"=>"USA",
   "id"=>"1",
   "street_and_house"=>"Everyone's Lane",
   "phone"=>"36365",
   "user_id"=>"1",
   "opening_hours"=>"Mon-Fri 10am-8pm, Sat 10am-6pm",
   "city_and_zip"=>"Detroit",
   "state"=>"Michigan"}>