The core data programming guide say this about transformable attributes:
... Core Data uses an instance of NSValueTransformer to convert the
attribute to and from an instance of NSData. Core Data then stores
the data instance to the persistent store. By default, Core Data
uses the NSKeyedUnarchiveFromDataTransformerName transformer,
however you can specify your own transformer if you want.
... If you specify a custom transformer, it must transform an
instance of the non-standard data type into an instance of NSData
and support reverse transformation.
The first paragraph (and the description of
NSKeyedUnarchiveFromDataTransformerName) says that the forward
transformation is NSData->SomeClass.
The second paragraph says that the forward transformation is SomeClass-
>NSData.
Anyone know which is the correct answer?
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