Remove :polymorphic from INVALID_AUTOMATIC_INVERSE_OPTIONS

This makes automatic inverse detection possible for polymorphic
:has_one & :has_many possible.

This resolves a number of issues, eg. `touch: true` on polymorphic relationships (#16446) and automatically setting inverse associations on newly built objects (#15028, #21843).

1 files changed, 2 insertions, 6 deletions

diff --git a/activerecord/test/cases/associations/inverse_associations_test.rb b/activerecord/test/cases/associations/inverse_associations_test.rb
index 287b3e9ebc..cf51f1009f 100644
--- a/activerecord/test/cases/associations/inverse_associations_test.rb
+++ b/activerecord/test/cases/associations/inverse_associations_test.rb
@@ -116,15 +116,11 @@ class AutomaticInverseFindingTests < ActiveRecord::TestCase
     assert !club_reflection.has_inverse?, "A has_many_through association should not find an inverse automatically"
   end
 
-  def test_polymorphic_relationships_should_still_not_have_inverses_when_non_polymorphic_relationship_has_the_same_name
+  def test_polymorphic_has_one_should_find_inverse_automatically
     man_reflection = Man.reflect_on_association(:polymorphic_face_without_inverse)
-    face_reflection = Face.reflect_on_association(:man)
-
-    assert_respond_to face_reflection, :has_inverse?
-    assert face_reflection.has_inverse?, "For this test, the non-polymorphic association must have an inverse"
 
     assert_respond_to man_reflection, :has_inverse?
-    assert !man_reflection.has_inverse?, "The target of a polymorphic association should not find an inverse automatically"
+    assert man_reflection.has_inverse?
   end
 end