1 files changed, 2 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 44ac37c498..60a9eee7c7 100644
--- a/activerecord/lib/active_record/connection_adapters/abstract/quoting.rb
+++ b/activerecord/lib/active_record/connection_adapters/abstract/quoting.rb
@@ -31,9 +31,10 @@ module ActiveRecord
           # BigDecimals need to be put in a non-normalized form and quoted.
         when nil        then "NULL"
         when BigDecimal then value.to_s('F')
-        when Numeric    then value.to_s
+        when Numeric, ActiveSupport::Duration 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