Merge pull request #31475 from shioyama/reset_column_information_redefine_child_attribute_methods

Undefine attribute methods of descendants when resetting column information

activerecord/CHANGELOG.md

+*   Undefine attribute methods on descendants when resetting column
+    information.
+
+    *Chris Salzberg*
+
 *   Log database query callers
 
     Add `verbose_query_logs` configuration option to display the caller

activerecord/lib/active_record/model_schema.rb

@@ -425,7 +425,7 @@ def content_columns
       #  end
       def reset_column_information
         connection.clear_cache!
-        undefine_attribute_methods
+        ([self] + descendants).each(&:undefine_attribute_methods)
         connection.schema_cache.clear_data_source_cache!(table_name)
 
         reload_schema_from_cache

activerecord/test/cases/persistence_test.rb

@@ -1106,13 +1106,18 @@ def test_save_touch_false
   end
 
   def test_reset_column_information_resets_children
-    child = Class.new(Topic)
-    child.new # force schema to load
+    child_class = Class.new(Topic)
+    child_class.new # force schema to load
 
     ActiveRecord::Base.connection.add_column(:topics, :foo, :string)
     Topic.reset_column_information
 
-    assert_equal "bar", child.new(foo: :bar).foo
+    # this should redefine attribute methods
+    child_class.new
+
+    assert child_class.instance_methods.include?(:foo)
+    assert child_class.instance_methods.include?(:foo_changed?)
+    assert_equal "bar", child_class.new(foo: :bar).foo
   ensure
     ActiveRecord::Base.connection.remove_column(:topics, :foo)
     Topic.reset_column_information