Question

I’m trying to find an object matching a string and a set of objects. My predicate looks like this:

NSPredicate *predicate = [NSPredicate predicateWithFormat:@"name == %@ and individuals CONTAINS %@", name, individuals];

I’m not getting any hits. Although I know there is an entity matching the name and individuals set.

What is wrong with my predicate?

EDIT: I’ve managed to do some progress. The problem now is if I try to find a group which has an existing group name and existing contacts ie groupname = “test” and individuals.name = “john doe” and individuals.contactInfo = “123” it will find me this group correctly but if I have a group with the same groupname and same contact + another contact it will also find me this group which I do not want.

I only want the group which matches exactly the predicate.

I’m now using subpredicates by doing this:

NSMutableArray *subPredicates = [NSMutableArray initWithCapacity:5];
// Add group name to predicate
[subPredicates addObject:[NSPredicate predicateWithFormat:@"name == %@", name]];

for (NSDictionary *contactInfo in individuals) {

    NSString *name = [contactDict objectForKey:@"name"];
    NSString *contactInfo = [contactDict objectForKey:@"contactInfo"];

    NSPredicate *individualPredicate = [NSPredicate predicateWithFormat:@"ANY individuals.name LIKE %@ AND any individuals.contactInfo LIKE %@", name, contactInfo];

    [subPredicates addObject:individualPredicate];
}

NSPredicate *individualsPredicate = [NSCompoundPredicate andPredicateWithSubpredicates:subPredicates];

Group *group = // do the fetch with the predicate

Answer 1

I am typing this on the phone and cannot verify it, but the following predicate might work for you:

[NSPredicate predicateWithFormat:@"name == %@ AND SUBQUERY(individuals, $x, $x IN %@).@count == %d", 
    name, individuals, individuals.count];

It searches for objects with the given name whose individuals are a superset of the given set.