build_column_serializer

# File activerecord/lib/active_record/attribute_methods/serialization.rb, line 228
          def build_column_serializer(attr_name, coder, type, yaml = nil)
            # 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 = Coders::JSON if coder == ::JSON

            if coder == ::YAML || coder == Coders::YAMLColumn
              Coders::YAMLColumn.new(attr_name, type, **(yaml || {}))
            elsif coder.respond_to?(:new) && !coder.respond_to?(:load)
              coder.new(attr_name, type)
            elsif type && type != Object
              Coders::ColumnSerializer.new(attr_name, coder, type)
            else
              coder
            end
          end