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Q: 

NSOutlineView getting an assertion error when expanding items

Looks like my data model has some problem, so that i get this error from time to time when expanding items. Does anyone has an idea what this assert means?

2010-10-20 03:04:47.547 test_tree[60332:613] * Assertion failure in -NSOutlineView _expandItemEntry:expandChildren:startLevel:, /SourceCache/AppKit/AppKit-949.54/TableView.subproj/NSOutlineView.m:1003 2010-10-20 03:04:47.548 test_tree[60332:613] Invalid parameter not satisfying: itemEntry->children == NULL

A: 

Just a guess: make sure that your model does not let an object be a child of itself. The Outline view definitely doesn't like the same object showing up like that.

Jeff  2010-10-20 02:36:22

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