On 28-May-09, at 10:39 AM, Keary Suska wrote:
On May 28, 2009, at 7:03 AM, Rick Hoge wrote:
I have a core data (doc-based) app in which one of the entities
includes a custom object as a persistent attribute. The custom
object class implements NSCoding, and these objects are saved to
the core data store with no problem (they are read back correctly
etc). Instance variables of the custom object are exposed in the
user interface, and can be edited by the user.
The problem I have is that changes to instance variables of these
custom objects are not reported to the managed object context, so
the core data document is not flagged as dirty and, even if I force
a save by adding an entity and invoking save, the modified custom
object is not saved (if I quit and reload the old ivar values are
loaded).
http://developer.apple.com/documentation/Cocoa/Conceptual/CoreData/Articles/cdNSAttributes.html#/
/apple_ref/doc/uid/TP40001919
Thanks - I'd looked at this, and following the information there is
what allowed me to insert and display custom object attributes. The
documentation shows examples in which an attribute of type NSColor can
be set and archived. My problem is that I'm dealing with a complex
object type (I have what I think are good reasons for doing this) and
I need to flag the context as dirty if an ivar of the custom object is
modified.
Specifically my entity has a 'transformable' attribute for which the
values are a custom object class, and this object class has an ivar
that is an NSMutableDictionary. The user can modify entries in this
dictionary, and I would like this to cause the context to be flagged
as dirty and to have the custom object flagged to be updated in the
persistent store.
Hope this clarifies things, and thanks again for the suggestion.
Rick
Keary Suska
Esoteritech, Inc.
"Demystifying technology for your home or business"
(43092.6825)
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