Fix `automatic_inverse_of` not to be disabled if extension block is given

If an association has a scope, `automatic_inverse_of` is to be disabled.
But extension block is obviously not a scope. It should not be regarded
as a scope.

Fixes #28806.

1 files changed, 9 insertions, 0 deletions

diff --git a/activerecord/test/cases/associations/inverse_associations_test.rb b/activerecord/test/cases/associations/inverse_associations_test.rb
index da3a42e2b5..669e176dcb 100644
--- a/activerecord/test/cases/associations/inverse_associations_test.rb
+++ b/activerecord/test/cases/associations/inverse_associations_test.rb
@@ -8,6 +8,7 @@ require "models/zine"
 require "models/club"
 require "models/sponsor"
 require "models/rating"
+require "models/post"
 require "models/comment"
 require "models/car"
 require "models/bulb"
@@ -62,6 +63,14 @@ class AutomaticInverseFindingTests < ActiveRecord::TestCase
     assert_equal rating_reflection, comment_reflection.inverse_of, "The Comment reflection's inverse should be the Rating reflection"
   end
 
+  def test_has_many_and_belongs_to_should_find_inverse_automatically_for_extension_block
+    comment_reflection = Comment.reflect_on_association(:post)
+    post_reflection = Post.reflect_on_association(:comments)
+
+    assert_predicate post_reflection, :has_inverse?
+    assert_equal comment_reflection, post_reflection.inverse_of
+  end
+
   def test_has_many_and_belongs_to_should_find_inverse_automatically_for_sti
     author_reflection = Author.reflect_on_association(:posts)
     author_child_reflection = Author.reflect_on_association(:special_posts)