NSError *err;
BOOL result = [moc save: &err];
Make sure you initialize err:
NSError *err = nil;
Otherwise, you may be dealing with a bogus error object, since
method-scope
variables are not automatically initialized to 0. (Instance
variables are
initialized, btw.) I don't think that would affect the return value
of
save, but it's a good habit either way.
It doesn't and the initial value of err is irrelevant unless your code
is broken.
You should *never* assume *anything* about the value of err across a
call to -save: or any other similar method *unless* the result
indicates an error.
Similarly, you should *never* pass an instance of NSError into
something like save: and assume that you'll get it back in the case of
an error.
(I have seen both bugs a number of times.)
b.bum
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