[bug #22565] EOKeyValueCoding: Support modern Cocoa KVC semantics for NSArray aggregate functions

[Tim McIntosh]

Follow-up Comment #4, bug #22565 (project gnustep):

I attached a contrived but concrete example in KVC.zip, which I ran on Mac OS
10.5 and OPENSTEP 4.2 + EOF 2.1.  The results are somewhat surprising--EOF 2.1
gives the same results as Cocoa for valueForKeyPath: when a key path is used
with an aggregate operator.  I don't have WO4.5 so I can't test that version
of EOF (I could test the WO4 version if I could get Mac OS X Server going
again).

Note that the behavior of valueForKey: appears to be different between EOF
and Cocoa.  In EOF, valueForKey: implemented the aggregate operators, but in
Cocoa they appear to be implemented only in valueForKeyPath:.

In Cocoa, @sum.x.y.z appears to mean different things depending on whether it
is interpreted as a key or a key path.  The valueForKey: method of NSArray and
NSSet appears to work as documented in NSDictionary with respect to keys
starting with "@" (though I don't see this documented for NSArray and NSSet):

  "If key does start with “@”, strips the “@” and invokes [super
valueForKey:] with the rest of the key."


(file #15262)
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Additional Item Attachment:

File name: KVC.zip                        Size:42 KB


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