Mention and test has_object with multiple names

README.md

@@ -56,6 +56,9 @@ end
 > [!TIP]
 > `has_object` only requires a namespace and an initializer that takes a single argument. The above `Post::Publisher` is perfectly valid as an Associated Object — same goes for `class Post::Publisher < Data.define(:post); end`.
 
+> [!TIP]
+> You can pass multiple names too: `has_object :publisher, :classified, :fortification`. I recommend `-[i]er`, `-[i]ed` and `-ion` as the general naming conventions for your Associated Objects.
+
 See how we're always expecting a link to the model, here `post`?
 
 Because of that, you can rely on `post` from the associated object:

test/active_record/associated_object/object_association_test.rb

@@ -2,20 +2,20 @@
 
 require "test_helper"
 
-class ActiveRecord::AssociatedObject::ObjectAssociationTest < Minitest::Test
-  def setup
-    super
-    @post = Post.first
-  end
+class ActiveRecord::AssociatedObject::ObjectAssociationTest < ActiveSupport::TestCase
+  test "standard PORO can be accessed" do
+    assert_kind_of Post::Mailroom, Post.first.mailroom
 
-  def test_standard_PORO_can_be_accessed
-    assert_kind_of Post::Mailroom, @post.mailroom
+    author = Author.first
+    assert_kind_of Author::Archiver,      author.archiver
+    assert_kind_of Author::Classified,    author.classified
+    assert_kind_of Author::Fortification, author.fortification
   end
 
-  def test_callback_passing_for_standard_PORO
+  test "callback passing for standard PORO" do
     Post::Mailroom.touched = false
 
-    @post.touch
-    assert @post.mailroom.touched
+    Post.first.touch
+    assert Post.first.mailroom.touched
   end
 end

test/boot/active_record.rb

@@ -26,7 +26,7 @@ class Author < ApplicationRecord
   has_many :posts,    dependent: :destroy
   has_many :comments, dependent: :destroy, class_name: "Post::Comment"
 
-  has_object :archiver
+  has_object :archiver, :classified, :fortification
 end
 
 class Post < ApplicationRecord

test/boot/associated_object.rb

@@ -11,6 +11,9 @@ class ApplicationRecord::AssociatedObject < ActiveRecord::AssociatedObject; end
 class Author::Archiver < ApplicationRecord::AssociatedObject
 end
 
+Author::Classified    = Data.define(:author)
+Author::Fortification = Data.define(:author)
+
 class Post::Publisher < ApplicationRecord::AssociatedObject
   mattr_accessor :performed,      default: false
   mattr_accessor :captured_title, default: nil