1 files changed, 28 insertions, 0 deletions
diff --git a/activerecord/lib/active_record/attributes/translator.rb b/activerecord/lib/active_record/attributes/translator.rb
new file mode 100644
index 0000000000..62fb874215
--- /dev/null
+++ b/activerecord/lib/active_record/attributes/translator.rb
@@ -0,0 +1,28 @@
+module ActiveRecord
+  module Attributes
+    class Translator # :nodoc:
+      def initialize(attributes, column_types)
+        @attributes   = attributes
+        @column_types = column_types
+      end
+
+      def cast_attribute(attr_name, method)
+        v = @attributes.fetch(attr_name) { yield }
+        v && send(method, attr_name, v)
+      end
+
+      def cast_serialized(attr_name, value)
+        value.unserialized_value
+      end
+
+      def cast_tz_conversion(attr_name, value)
+        value = cast_column(attr_name, value)
+        value.acts_like?(:time) ? value.in_time_zone : value
+      end
+
+      def cast_column(attr_name, value)
+        @column_types[attr_name].type_cast value
+      end
+    end
+  end
+end