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-rw-r--r--activerecord/lib/active_record/type/helpers/mutable.rb18
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..88a9099277
--- /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 cast(value)
+ deserialize(serialize(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 != serialize(new_value)
+ end
+ end
+ end
+ end
+end