objective-c - RestKit 手动保存对象

Question

我花了几个小时尝试插入/添加对象，但发生了重复的记录。事件记录已重新插入，即使它已经存在。我错过了什么吗？

下面是我的代码:

广告系列.h

@interface Campaign : NSManagedObject

@property (nonatomic, strong) NSNumber* campaignId;
@property (nonatomic, strong) NSString* title;

@end

Card.h

@class Campaign;

@interface Card : NSManagedObject

@property (nonatomic, strong) NSNumber* cardId;
@property (nonatomic, strong) NSString* name;
@property (nonatomic, strong) Campaign* campaign;

@end

ViewController.m

...

Campaign* campaign = [Campaign object];
campaign.campaignId = [NSNumber numberWithInt:1];
campaign.title = @"Hello world";

Card* card = [Card object];
card.cardId = @"1234567890";
card.campaign = campaign;

[[[RKObjectManager sharedManager] objectStore] save:nil];

已编辑 ViewController.m

...
RKManagedObjectMapping* cardMapping = [RKManagedObjectMapping mappingForClass:[Card class] inManagedObjectStore:[RKObjectManager sharedManager].objectStore];
[cardMapping mapKeyPath:@"id" toAttribute:@"cardId"];
[campaignMapping mapKeyPath:@"name" toAttribute:@"name"];
cardMapping.primaryKeyAttribute = @"cardId";

RKManagedObjectMapping* campaignMapping = [RKManagedObjectMapping mappingForClass:[Campaign class] inManagedObjectStore:[RKObjectManager sharedManager].objectStore];
[campaignMapping mapKeyPath:@"id" toAttribute:@"campaignId"];
[campaignMapping mapKeyPath:@"title" toAttribute:@"title"];
campaignMapping.primaryKeyAttribute = @"campaignId";

Campaign* campaign = [Campaign object];
campaign.campaignId = [NSNumber numberWithInt:1];
campaign.title = @"Hello world";

Card* card = [Card object];
card.cardId = @"1234567890";
card.campaign = campaign;

[[[RKObjectManager sharedManager] objectStore] save:nil];

Answer 1

是的，将 .primaryKeyAttribute 添加到您的映射中。当您通过 rest kit 导入数据时，这将为您完成 pk 工作。如果你只是用 Restkit 做“正常”的核心数据，你需要自己处理引用完整性等。