CoreData many-to-many relationship NSPredicate Exceptions

Posted by user307550 on Stack Overflow See other posts from Stack Overflow or by user307550
Published on 2010-04-02T08:52:22Z Indexed on 2010/04/05 15:43 UTC
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Filed under:

objective-c

|

core-data

|

nspredicate

I'm trying to model a Person/Team relationship. It's a many to many relationship since a person can belong to multiple teams and a team can have multiple people. As suggested by the doc I created an intermediate entity called TeamMember. I am now trying to run a query to see if I have a list of people, whether a pre-existing Team already exists for them so I'm not storing duplicate Teams in the database

NSFetchRequest *request = [[[NSFetchRequest alloc] init] autorelease];
NSEntityDescription *entity =
[NSEntityDescription entityForName:@"Team"
            inManagedObjectContext:[pm managedObjectContext]];
[request setEntity:entity];

NSPredicate *predicate = nil;
predicate = [NSPredicate predicateWithFormat:@"ALL %K IN %@", @"teamMembers.person",  players];

players is an NSSet of people that I'm trying to search

I'm getting the following exception:

Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: 'Unsupported predicate ALL teamMembers.person IN { (entity: Person; id: 0x1334470 ; data: {

Ideally I would like them to match exactly and not just do an IN as well.

Any help would be greatly appreciated

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