On Mar 12, 2011, at 3:36 AM, Indragie Karunaratne wrote:
> I have an NSManagedObject that has the following string attributes:
>
> artist, albumArtist, composer, comments, and lyrics
>
> I need to write an NSPredicate that will take an array of search terms, and
> check if all of the above string attributes COMBINED contains every term in
> the search term array. I tried the following predicate format:
>
> NSArray *searchTerms = [NSArray arrayWithObjects:@"testing", @"search", nil];
> NSPredicate *predicate = [NSPredicate predicateWithFormat:@"ALL %@ IN {
> artist, albumArtist, composer, comments, lyrics }", searchTerms];
>
> This triggered a parsing error and would not run. Is there any way I can do
> this in an NSPredicate, aside from creating a "search string" attribute in my
> data model containing a concatenated string of the above attributes?
You should not include the object where the predicate is run against into the
parameters of the format string. Otherwise, you would get a constant
expression, rather a predicate.
Furthermore, when specifying an embedded string-list you need to quote the
string elements.
This should work then:
NSArray* terms = ...
NSPredicate* pred = [NSPredicate predicateWithFormat:@"ALL self IN {'artist',
'albumArtist', 'composer', 'comments'}"];
BOOL test = [pred evaluateWithObject:terms];
Note: you can use a ^block for the predicate as well.
Regards
Andreas_______________________________________________
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