1 files changed, 18 insertions, 0 deletions
diff --git a/activerecord/lib/active_record/type/helpers/mutable.rb b/activerecord/lib/active_record/type/helpers/mutable.rb
new file mode 100644
index 0000000000..dc37f4a885
--- /dev/null
+++ b/activerecord/lib/active_record/type/helpers/mutable.rb
@@ -0,0 +1,18 @@
+module ActiveRecord
+  module Type
+    module Helpers
+      module Mutable # :nodoc:
+        def type_cast_from_user(value)
+          type_cast_from_database(type_cast_for_database(value))
+        end
+
+        # +raw_old_value+ will be the `_before_type_cast` version of the
+        # value (likely a string). +new_value+ will be the current, type
+        # cast value.
+        def changed_in_place?(raw_old_value, new_value)
+          raw_old_value != type_cast_for_database(new_value)
+        end
+      end
+    end
+  end
+end