Fixes STI when 2+ levels deep.

PR #14052 Added a regression where it was only looking for methods in one
level up, So when the method was defined in a 2+ levels up the
inheritance chain, the method was not found as defined.

1 files changed, 13 insertions, 0 deletions

diff --git a/activerecord/test/cases/attribute_methods_test.rb b/activerecord/test/cases/attribute_methods_test.rb
index 1a1e442df0..173081cb28 100644
--- a/activerecord/test/cases/attribute_methods_test.rb
+++ b/activerecord/test/cases/attribute_methods_test.rb
@@ -746,6 +746,19 @@ class AttributeMethodsTest < ActiveRecord::TestCase
     assert "unknown attribute: hello", error.message
   end
 
+  def test_methods_override_in_multi_level_subclass
+    klass = Class.new(Developer) do
+      def name
+        "dev:#{read_attribute(:name)}"
+      end
+    end
+
+    2.times { klass = Class.new klass }
+    dev = klass.new(name: 'arthurnn')
+    dev.save!
+    assert_equal 'dev:arthurnn', dev.reload.name
+  end
+
   def test_global_methods_are_overwritten
     klass = Class.new(ActiveRecord::Base) do
       self.table_name = 'computers'