1 files changed, 26 insertions, 16 deletions
diff --git a/activerecord/lib/active_record/timestamp.rb b/activerecord/lib/active_record/timestamp.rb
index 04a1c03474..a5862ae06b 100644
--- a/activerecord/lib/active_record/timestamp.rb
+++ b/activerecord/lib/active_record/timestamp.rb
@@ -59,19 +59,26 @@ module ActiveRecord
         attribute_names.index_with(time || current_time_from_proper_timezone)
       end
 
-      private
-        def timestamp_attributes_for_create_in_model
-          timestamp_attributes_for_create.select { |c| column_names.include?(c) }
-        end
+      def timestamp_attributes_for_create_in_model
+        @timestamp_attributes_for_create_in_model ||=
+          (timestamp_attributes_for_create & column_names).freeze
+      end
 
-        def timestamp_attributes_for_update_in_model
-          timestamp_attributes_for_update.select { |c| column_names.include?(c) }
-        end
+      def timestamp_attributes_for_update_in_model
+        @timestamp_attributes_for_update_in_model ||=
+          (timestamp_attributes_for_update & column_names).freeze
+      end
 
-        def all_timestamp_attributes_in_model
-          timestamp_attributes_for_create_in_model + timestamp_attributes_for_update_in_model
-        end
+      def all_timestamp_attributes_in_model
+        @all_timestamp_attributes_in_model ||=
+          (timestamp_attributes_for_create_in_model + timestamp_attributes_for_update_in_model).freeze
+      end
 
+      def current_time_from_proper_timezone
+        default_timezone == :utc ? Time.now.utc : Time.now
+      end
+
+      private
         def timestamp_attributes_for_create
           ["created_at", "created_on"]
         end
@@ -80,8 +87,11 @@ module ActiveRecord
           ["updated_at", "updated_on"]
         end
 
-        def current_time_from_proper_timezone
-          default_timezone == :utc ? Time.now.utc : Time.now
+        def reload_schema_from_cache
+          @timestamp_attributes_for_create_in_model = nil
+          @timestamp_attributes_for_update_in_model = nil
+          @all_timestamp_attributes_in_model = nil
+          super
         end
     end
 
@@ -124,19 +134,19 @@ module ActiveRecord
     end
 
     def timestamp_attributes_for_create_in_model
-      self.class.send(:timestamp_attributes_for_create_in_model)
+      self.class.timestamp_attributes_for_create_in_model
     end
 
     def timestamp_attributes_for_update_in_model
-      self.class.send(:timestamp_attributes_for_update_in_model)
+      self.class.timestamp_attributes_for_update_in_model
     end
 
     def all_timestamp_attributes_in_model
-      self.class.send(:all_timestamp_attributes_in_model)
+      self.class.all_timestamp_attributes_in_model
     end
 
     def current_time_from_proper_timezone
-      self.class.send(:current_time_from_proper_timezone)
+      self.class.current_time_from_proper_timezone
     end
 
     def max_updated_column_timestamp