CoreData: NSPredicate with to-many relationships [duplicate]

Question

This question already has an answer here:

Core Data NSPredicate with to-Many Relationship (1 answer)

Closed 9 years ago.

Please help me make right fetch request. I want to fetch all Requests where rates.identRater!='someIdent' I try with predicates:

1

[NSPredicate predicateWithFormat:@"!(ANY rates.identRater == %@)", identRater]

2

[NSPredicate predicateWithFormat:@"NONE rates.identRater == %@", identRater]

3

[NSPredicate predicateWithFormat:@"!(%@ IN rates.identRater)", identRater]

Requests properties

@property (nonatomic, retain) NSString * additionalInfo;
@property (nonatomic, retain) NSNumber * duplicate;
@property (nonatomic, retain) NSDecimalNumber * date;
@property (nonatomic, retain) NSDecimalNumber * dateAccept;
@property (nonatomic, retain) NSDecimalNumber * dateCreate;
@property (nonatomic, retain) NSDecimalNumber * dateChanged;
@property (nonatomic, retain) NSDecimalNumber * dateOfSale;
@property (nonatomic, retain) NSString * fio;
@property (nonatomic, retain) NSString * ident;
@property (nonatomic, retain) NSString * identChanger;
@property (nonatomic, retain) NSString * identOwner;
@property (nonatomic, retain) NSString * identSelectedRate;
@property (nonatomic, retain) NSString * phone;
@property (nonatomic, retain) NSString * status;
@property (nonatomic, retain) Rates *selectedRate;
@property (nonatomic, retain) RequestCar *car;
@property (nonatomic, retain) RequestExterior *exterior;
@property (nonatomic, retain) RequestBundling *bundling;
@property (nonatomic, retain) RequestInterior *interior;
@property (nonatomic, retain) RequestNewCar *theNewCar;
@property (nonatomic, retain) RequestTestdrive *testDrive;
@property (nonatomic, retain) RequestFinalRate *finalRate;
@property (nonatomic, retain) Users *owner;
@property (nonatomic, retain) NSSet *viewedToRate;
@property (nonatomic, retain) NSSet *hiddenToRate;
@property (nonatomic, retain) NSSet *photos;
@property (nonatomic, retain) NSSet *diagnosticPhotos;
@property (nonatomic, retain) NSSet *rates;

Rates properties

@property (nonatomic, retain) NSDecimalNumber * cost;
@property (nonatomic, retain) NSDecimalNumber * costOfSale;
@property (nonatomic, retain) NSString * securityComment;
@property (nonatomic, retain) NSDecimalNumber * dateChanged;
@property (nonatomic, retain) NSString * ident;
@property (nonatomic, retain) NSString * identManager;
@property (nonatomic, retain) NSString * identRater;
@property (nonatomic, retain) NSString * identRequest;
@property (nonatomic, retain) NSDecimalNumber * date;
@property (nonatomic, retain) Requests *request;
@property (nonatomic, retain) Users *rater;
@property (nonatomic, retain) ViewedToRateRequests *viewed;
@property (nonatomic, retain) HiddenToRateRequests *hidden;
@property (nonatomic, retain) Requests *selectedInRequest;

Trying to fetch

NSFetchRequest *fetch = [[NSFetchRequest alloc] init];
[fetch setEntity:[NSEntityDescription entityForName:@"Requests" inManagedObjectContext:moc]];
[fetch setPredicate:[NSPredicate predicateWithFormat:@"!(ANY rates.identRater == %@)", @"someIdent"]];
[fetch setSortDescriptors:@[[[NSSortDescriptor alloc] initWithKey:@"dateChanged" ascending:YES]]];

If I use any of predicate listed above, CoreData return 0 rows.. but I want to see 1 row..

Please, help me..

Answer 1

This should work:

[NSPredicate predicateWithFormat:@"SUBQUERY(rates, $r, $r.identRater == %@).@count == 0", identRater]

It would appear that other options are not working correctly so a subquery is the only solution: Core Data NSPredicate with to-Many Relationship

Answer 2

You're on the right track. It's the string comparison operator that needs adjustment. And I think your idea number 2 is the most direct way to state your intent.

[NSPredicate predicateWithFormat:@"NONE rates.identRater LIKE %@", identRater];

(I haven't tested this).