class_name option doesn't seem to do anything

[ghost]

In both Rails 6 console and IRB, (and in the original AwesomePrint gem as well), the class_name option doesn't seem to have any effect.

The class name seems to always be printed as the result of calling to_s on the object, no matter what the class_name option is set to.

o = Object.new
#<Object:0x00007fed5affae48>

ap o
#<Object:0x00007fed5affae48>

ap o, class_name: :to_yaml
#<Object:0x00007fed5affae48>

The reason I'm trying to use this is, I have an ActiveRecord model with a to_s instance method, and want to print out the class/model name when I print it to console or debug log. Example:

class Member < ApplicationRecord
...
    def to_s
        full_name
    end
...
end

ap Member.first

Nathan Fahey {
               :id => "096e9d23-2c66-4e11-8110-50e60e59c05f",
         :zip_code => "10014",
       :first_name => "Nathan",
        :last_name => "Fahey",
...
}

I would like to be able to see the class name, like when I do:

ap Member
class Member < ApplicationRecord {
               :id => :uuid,
         :zip_code => :string,
       :first_name => :string,
        :last_name => :string,
  ...
}

But when I do:

ap Member.first, class_name: :class

or set class_name to any string or symbol, I get the result of Member.first.to_s for the class name.

Also, setting the option, object_id: false does not seem to help.

[HarlemSquirrel]

Hi @tgrushka and thanks for taking the time to open this issue.

I've not used this feature myself or even tried it since I forked the repo but I spent some time poking around today and it seems the :class_name option only works with the ObjectFormatter today which is only used when raw: true is set. Additionally, the class name option is only used when object_id: false option is set.

Here's an examaple of it working today:

require_relative 'lib/amazing_print'

class Person
  attr_accessor :name
  attr_reader :created_at

  def initialize
    @created_at = Time.now
  end
end

class Wizard < Person
  attr_accessor :sword
end

person = Wizard.new
person.name = 'Gandalf'
person.sword = 'Glamdring'

puts "\n Just ap"
ap person

puts "\n Now ap with class_name: :name"
ap person, class_name: :name, object_id: false, raw: true

Here's the output I get

I'm definitely open to improving this so :class_name is used in more places.
It does make sense to me to omit the object ID when using custom class names to avoid confusion about the real class name so that part may just need clarifying in our documentation.