Andreas,
That predicate syntax (and block predicates) won't work in my case because I'm
using them in a Core Data NSFetchRequest. I did, however, manage to solve this
issue by using subpredicates:
NSPredicate *basePredicate = [NSPredicate predicateWithFormat:@"(name
CONTAINS[cd] $QUERY) OR (artist.name CONTAINS[cd] $QUERY)"];
NSMutableArray *andPredicates = [NSMutableArray array];
for (NSString *term in terms) {
NSDictionary *substitution = [NSDictionary
dictionaryWithObjectsAndKeys:term, @"QUERY", nil];
NSPredicate *andPredicate = [basePredicate
predicateWithSubstitutionVariables:substitution];
[andPredicates addObject:andPredicate];
}
NSPredicate *finalPredicate = [NSCompoundPredicate
andPredicateWithSubpredicates:andPredicates];
On 2011-03-12, at 6:17 AM, Andreas Grosam wrote:
>
> 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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