1 files changed, 3 insertions, 1 deletions
diff --git a/activerecord/lib/active_record/connection_adapters/abstract/quoting.rb b/activerecord/lib/active_record/connection_adapters/abstract/quoting.rb
index f93c7cd74a..6f9f0399db 100644
--- a/activerecord/lib/active_record/connection_adapters/abstract/quoting.rb
+++ b/activerecord/lib/active_record/connection_adapters/abstract/quoting.rb
@@ -34,6 +34,7 @@ module ActiveRecord
         when Numeric    then value.to_s
         when Date, Time then "'#{quoted_date(value)}'"
         when Symbol     then "'#{quote_string(value.to_s)}'"
+        when Class      then "'#{value.to_s}'"
         else
           "'#{quote_string(YAML.dump(value))}'"
         end
@@ -71,7 +72,8 @@ module ActiveRecord
         when Date, Time then quoted_date(value)
         when Symbol     then value.to_s
         else
-          YAML.dump(value)
+          to_type = column ? " to #{column.type}" : ""
+          raise TypeError, "can't cast #{value.class}#{to_type}"
         end
       end