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NSTableView, NSArrayController predicate, change data exception
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NSTableView, NSArrayController predicate, change data exception


  • Subject: NSTableView, NSArrayController predicate, change data exception
  • From: Trygve Inda <email@hidden>
  • Date: Mon, 13 Jan 2014 09:04:10 -0800
  • Thread-topic: NSTableView, NSArrayController predicate, change data exception

I have an NSTableView backed by an NSArrayController.

I call setFilterPredicate on the NSArrayController to set a predicate of
"rating == 2" This does filter the table to show only those entries where
rating is 2.

The rating column is a Level Indicator and set to show star ratings in IB.
It is tied to the NSArrayController with a binding. If I edit the rating
field to change it while the table has a filter predicate, the line item
disappears (because it no longer matches the predicate), but I get this:



 *** -[__NSArrayM objectAtIndex:]: index 0 beyond bounds for empty array

    0   CoreFoundation                      0x00007fff8684fb06
__exceptionPreprocess + 198
    1   libobjc.A.dylib                     0x00007fff8edda3f0
objc_exception_throw + 43
    2   CoreFoundation                      0x00007fff867ec8ec -[__NSArrayM
objectAtIndex:] + 252
    3   AppKit                              0x00007fff8ddecf0e -[NSBinder
_setValue:forKeyPath:ofObject:mode:validateImmediately:raisesForNotApplicabl
eKeys:error:] + 568
    4   AppKit                              0x00007fff8e0eb47a -[NSBinder
setValue:forBinding:atIndex:error:] + 557
    5   AppKit                              0x00007fff8e476b83
-[_NSValueBinderPlugin
applyObjectValue:forBinding:operation:needToRunAlert:error:] + 248
    6   AppKit                              0x00007fff8e4353e8
-[NSValueBinder
_applyObjectValue:forBinding:canRecoverFromErrors:handleErrors:typeOfAlert:d
iscardEditingCallback:otherCallback:callbackContextInfo:didRunAlert:] + 107
    7   AppKit                              0x00007fff8e4358dc
-[NSValueBinder
applyDisplayedValueHandleErrors:typeOfAlert:canRecoverFromErrors:discardEdit
ingCallback:otherCallback:callbackContextInfo:didRunAlert:error:] + 612
    8   AppKit                              0x00007fff8e436633
-[NSValueBinder performAction:] + 305
    9   AppKit                              0x00007fff8e47272f
-[_NSBindingAdaptor _objectDidTriggerAction:bindingAdaptor:] + 133
    10  AppKit                              0x00007fff8e47289e
-[_NSBindingAdaptor objectDidTriggerAction:] + 196
    11  AppKit                              0x00007fff8df7179a -[NSControl
sendAction:to:] + 56
    12  AppKit                              0x00007fff8df716eb -[NSCell
_sendActionFrom:] + 138
    13  AppKit                              0x00007fff8df6f943 -[NSCell
trackMouse:inRect:ofView:untilMouseUp:] + 1199
    14  AppKit                              0x00007fff8e269514
-[NSLevelIndicatorCell trackMouse:inRect:ofView:untilMouseUp:] + 118
    15  AppKit                              0x00007fff8e376ec0 -[NSTableView
_tryCellBasedMouseDown:atRow:column:withView:] + 1650
    16  AppKit                              0x00007fff8e37833b -[NSTableView
mouseDown:] + 4540
    17  AppKit                              0x00007fff8df6650e -[NSWindow
sendEvent:] + 6853
    18  AppKit                              0x00007fff8df62644
-[NSApplication sendEvent:] + 5761
    19  AppKit                              0x00007fff8de7821a
-[NSApplication run] + 636


If there is no predicate set to filter the NSArrayController, then no error
occurs.



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