如何删除具有用户定义的ID的CoreData对象？ [英] How to delete the CoreData Objects with user-defined id?

问题描述

我有这样的对象

@interface Clubs : NSManagedObject

@property (nonatomic, retain) NSString * catname;
@property (nonatomic, retain) NSString * clubdescription;
@property (nonatomic, retain) NSString * clubid;
@property (nonatomic, retain) NSString * clubname;
@property (nonatomic, retain) NSString * distance;
@property (nonatomic, retain) NSString * logopath;
@property (nonatomic, retain) NSString * phone;
@property (nonatomic, retain) NSString * clubtype;

@end

我要删除的对象只有特定的clubid ？

I want to delete only those object have are particular clubid?

假设CoreData中有20个俱乐部，只有这些对象需要删除，其clubid为120.

Suppose there are twenty clubs are added to CoreData, only these object I want to delete whose clubid is 120.

感谢

推荐答案

    -(void)deleteClubsEntity:(NSString*)clubId // pass the value 120
    {
        NSError *error = nil;
        NSManagedObjectContext *context = [self managedObjectContext];

        NSFetchRequest * fetch = [[NSFetchRequest alloc] init];

       [fetch setEntity:[NSEntityDescription entityForName:@"Clubs" inManagedObjectContext: context]];
       [fetch setPredicate:[NSPredicate predicateWithFormat:@"(clubid
 contains[cd] %@)",clubId]];

       NSArray * records = [context executeFetchRequest:fetch error:&error];
           for (NSManagedObject * record in records) {
                [context deleteObject:record];
            }
       [context save:&error];
    }

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