从字典的数组中CoreData存储对象

Question

我的字典对象的数组friendsArray这看起来是这样的：

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

现在我将它存储到coredata这样

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]; 

} 

这里是SQL浏览器的屏幕截图

它是存储数据，但复制这本字典，我不知道为什么。

Answer 1

试试下面的 - 它有点清洁:)

观察日志语句多少次输出，并检查它的输出对象。

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：

您也可能会更好循环结束后太（如果你有一个大的数据集）后保存，只需移动if声明外循环。