The manuals for this give the following example:
NSPredicate *inPredicate =
[NSPredicate predicateWithFormat: @"attribute IN %@", aCollection];
It looks like you are missing the attribute... If attribute can vary, you can
use a %K and a NSString value representing the attribute name (it is not
automatically enclosed in quotes as %@ values are).
HTH,
Fred
On May 2, 2010, at 8:27 AM, Rick Mann wrote:
> Hi.
>
> I have two entities: Mission and Favorite. Favorite has a single relation to
> Mission. I need to fetch all Mission objects that exist in Favorite. I'm
> using an NSFetchResultsController.
>
> I created an array with all the Mission objects found in the Favorite entity.
> Then I tried to create a predicate like this:
>
> NSPredicate* pred = [NSPredicate predicateWithFormat: @"in %@",
> favoriteMissions];
>
> and use that on a fetch of Mission objects. But it complains that it can't
> parse that format string.
>
> Clearly, this approach isn't going to work. I could store the Mission's key
> in the Favorite table instead, but that's less elegant. Might be the only way
> to go.
>
> Any suggestions?
>
> tia,
> Rick
>
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