Re: Predicate expressions
Re: Predicate expressions
- Subject: Re: Predicate expressions
- From: "Hamish Allan" <email@hidden>
- Date: Sun, 1 Jun 2008 20:40:17 +0100
On Sun, Jun 1, 2008 at 8:26 PM, Kyle Sluder
<email@hidden> wrote:
> On Sat, May 31, 2008 at 4:57 PM, Fabian <email@hidden> wrote:
>> NSArray *arrayB = [self getObjects] ;
>>
>> NSArray *titles = [arrayB arrayByApplyingSelector:@selector(title)];
>> NSArray *subtitles = [arrayB arrayByApplyingSelector:@selector(subtitle)];
>>
>> NSPredicate *predicate = [NSPredicate predicateWithFormat:@"(title IN
>> %@) AND (subtitle IN %@)", titles, subtitles];
>> NSArray *result = [arrayA filteredArrayUsingPredicate:predicate];
>
> I am *really* confused as to what you're trying to do here. You have
> asked the NSArray for all objects from array B whose title is in the
> collection of all titles of objects in array B and whose subtitle is
> in the collection of all subtitles of objects in array B. Basically,
> you have said "give me all the objects."
He's asking for all objects of array *A* whose titles and subtitles
are in the collections from array B (see the target of
'filteredArrayUsingPredicate: above).
Hamish
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