Merge pull request #16059 from jenncoop/json-serialized-attr

Fixed issue with ActiveRecord serialize object as JSON

Conflicts:
	activerecord/CHANGELOG.md
	activerecord/lib/active_record/attribute_methods/serialization.rb

1 files changed, 6 insertions, 1 deletions

diff --git a/activerecord/lib/active_record/attribute_methods/serialization.rb b/activerecord/lib/active_record/attribute_methods/serialization.rb
index 734d94865a..264ce2bdfa 100644
--- a/activerecord/lib/active_record/attribute_methods/serialization.rb
+++ b/activerecord/lib/active_record/attribute_methods/serialization.rb
@@ -37,7 +37,12 @@ module ActiveRecord
         #     serialize :preferences, Hash
         #   end
         def serialize(attr_name, class_name_or_coder = Object)
-          coder = if [:load, :dump].all? { |x| class_name_or_coder.respond_to?(x) }
+          # When ::JSON is used, force it to go through the Active Support JSON encoder
+          # to ensure special objects (e.g. Active Record models) are dumped correctly
+          # using the #as_json hook.
+          coder = if class_name_or_coder == ::JSON
+                    Coders::JSON
+                  elsif [:load, :dump].all? { |x| class_name_or_coder.respond_to?(x) }
                     class_name_or_coder
                   else
                     Coders::YAMLColumn.new(class_name_or_coder)