I am trying to get @distinctUnionOfArrays to work with bindings.
I have a Master NSArrayController. This contains an array of
NSMutableDictionary objects. Each Dictionary has three NSString keys/fields:
Genre, Artist, Album.
I set the content of the Master Controller to my NSMutableArray and all is
well - the array shows up in an NSTableView.
I then have a single-column TableView "Genre" I have Genre NSArrayController
and I try to bind this array controller to the Master Controler with IB:
Genre, bound to Master
Controller key: arrangedObjects
Model Key Path: @distinctUnionofArrays.Genre
My goal is to get a list of all the Genres in the Master array with no
duplicates... But I get a crash:
abort() called
*** Terminating app due to uncaught exception 'NSInvalidArgumentException',
reason: '-[NSCFString count]: unrecognized selector sent to instance
0x10045cc20'
*** Call stack at first throw:
(
0 CoreFoundation 0x00007fff86827444
__exceptionPreprocess + 180
1 libobjc.A.dylib 0x00007fff818b00f3
objc_exception_throw + 45
2 CoreFoundation 0x00007fff868801c0
+[NSObject(NSObject) doesNotRecognizeSelector:] + 0
3 CoreFoundation 0x00007fff867fa08f
___forwarding___ + 751
4 CoreFoundation 0x00007fff867f61d8
_CF_forwarding_prep_0 + 232
5 CoreFoundation 0x00007fff867d3a47
-[NSMutableArray addObjectsFromArray:] + 71
6 Foundation 0x00007fff859fdba4
-[NSArray(NSKeyValueCoding) _unionOfArraysForKeyPath:] + 112
7 Foundation 0x00007fff859fda74
-[NSArray(NSKeyValueCoding) _distinctUnionOfArraysForKeyPath:] + 28
8 Foundation 0x00007fff8598d4d7
-[NSArray(NSKeyValueCoding) valueForKeyPath:] + 566
9 Foundation 0x00007fff85930db6
-[NSObject(NSKeyValueCoding) valueForKeyPath:] + 376
Any ideas?
I tired binding in code (rather than IB) and while I made sure to bind Genre
to Master after Master already had it setContent, got the same result.
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