从Dictionary对象数组存储Core数据

Question

我有一个数组friendsArray的字典对象，看起来像这样：

(
        {
        name = "james p";
        phone = 345345345;
    },
        {
        name = "sam b";
        phone = 345345345;
    },
        {
        name = "aaron s";
        phone = 346346456;
    }
)

现在我将它存储到像这样的coredata

 NSMutableDictionary *friends = [[NSMutableDictionary alloc] init];

   for (int count = 0; count <[friendsArray count]; count++) {
    NSError *error;
    NSEntityDescription *entityDesc = [NSEntityDescription entityForName:@"FriendContacts" inManagedObjectContext:context];
    NSManagedObject *friendsObject  = [[NSManagedObject alloc] initWithEntity:entityDesc insertIntoManagedObjectContext:context];

    NSFetchRequest *request         = [[NSFetchRequest alloc] init];
    [request setEntity:entityDesc];

    friends = [friendsArray objectAtIndex:count];
    [friendsObject setValue:[friends objectForKey:@"name"] forKey:@"name"];
    [friendsObject setValue:[friends objectForKey:@"phone"] forKey:@"phone"];
    [context save:&error];

 }

以下是SQL Browser

的屏幕截图

它存储数据但是复制了这本字典，我不知道为什么。

Answer 1

尝试以下方法 - 它有点清洁：）

观察输出日志语句的次数并检查它输出的对象。

 NSEntityDescription *entityDesc = [NSEntityDescription entityForName:@"FriendContacts" inManagedObjectContext:context];
 for (NSDictionary *friend in friendsArray) {

    NSManagedObject *friendsObject  = [[NSManagedObject alloc] initWithEntity:entityDesc insertIntoManagedObjectContext:context];

    [friendsObject setValue:[friend objectForKey:@"name"] forKey:@"name"];
    [friendsObject setValue:[friend objectForKey:@"phone"] forKey:@"phone"];

    NSLog(@"Created new friends object: %@", friendsObject);

    if ([context hasChanges]) {
        NSError *error;
        if (![context save:&error]) {
            NSLog(@"Problem saving changes: %@", error);
        }
    }
 }

编辑：

在循环结束后你也可能更好地保存（如果你有一个大数据集），只需将if语句移到循环之外。