I have a property, 'meaning' on my objects in a core data model. It's optional.
I need to find all the meanings which contain a certain string (not terribly
efficient but a fairly rare search).
I started out with this predicate
[ NSPredicate predicateWithFormat:@"meaning CONTAINS %@", searchString
];
but it crashes with a EXC_BAD_ACCESS deep down in the SQLLite execution trying
to evaluate CFStringGetLength on a zero pointer. My assumption here is that
it's finding an object with a null meaning, so I want to filter them out. So I
tried
[ NSPredicate predicateWithFormat:@"( meaning != NULL ) AND ( meaning
CONTAINS %@ )", searchString ];
and a few variants thereof, but they crash the same way, leading me to think
perhaps both parts of the AND are evaluated whether or not the first part
succeeds, ie not like C's guaranteed shortcut, and perhaps I shouldn't expect
it to be.
I could split this into two, and will try that, but I was trying to figure out
how to use the SUBQUERY() syntax to do it in one. The documentation is a little
weak on this, does anyone have some serious NSPredicate skills and knows how to
do it?
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