NSData as value in NSManagedObject
NSData as value in NSManagedObject
- Subject: NSData as value in NSManagedObject
- From: Mikkel Eriksen <email@hidden>
- Date: Fri, 19 Feb 2010 10:04:39 +0100
I've put a small NSXMLDocument into a Core Data binary property like this:
code:
NSManagedObject *object = /* ... */
NSXMLDocument *xmlDoc = /* ... */
[object setValue:[xmlDoc XMLData] forKey:@"xml"];
When I go to retrieve it, it's wrapped in an array:
(gdb) print-object [object valueForKey:@"xml"]
<NSCFArray 0x12c6460>(
<3c3f786d 6c207665 7273696f 6e3d2231 2e302220 656e636f 64696e67
3d225554 462d3822 3f3e3c6a 6e6c7020 73706563 3d22312e 302b2220
636f6465 62617365 3d226874 74703a2f 2f777777
...etc...
So I end up having to use lastObject to get the actual data:
code:
NSData *xmlData = (NSData *)[[object valueForKey:@"xml"] lastObject];
NSXMLDocument *xmlDoc = [[NSXMLDocument alloc] initWithData:xmlData
options:NSXMLDocumentTidyXML
error:nil];
If I don't use lastObject, I get an exception:
2010-02-17 20:46:47.590 AO[7954:813] *** -[NSCFArray length]:
unrecognized selector sent to instance 0x1371170
I can't find anything in the docs for NSManagedObject or NSData that
would explain this, where do I look?
Regards,
Mikkel
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