Hi Alan,

The crash may be a bug in the way we compile calls to variadic functions (such as predicateWithFormat:). Could you locate the crash report and copy/paste the backtrace information?

Laurent

On Jan 6, 2011, at 11:14 AM, Alan Skipp wrote:

Hi everyone,

Has anyone had any trouble with NSPredicate causing occasional crashes when used with NSArrayController? Well actually about 50% of the time. 

What I have is a subclass of NSArrayController which is a data source for an NSTableView that accepts drag and drop operations. In 'awakeFromNib' a NSPredicate is defined, sometimes the error is just, “EXC_BAD_ACCESS”, other times there's a bit more info:

data_source.rb:20:in `awakeFromNib': NSInvalidArgumentException: Unable to parse the format string "AND" (RuntimeError)

This is the offending line:

@filter_predicate = NSPredicate.predicateWithFormat("file_type == 'NSFileTypeRegular'")

The crash doesn't always occur, when it doesn't my app works without any problems. I've tried the predicate in macirb and the crash doesn't occur!?

Best regards,

Alan

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