RestKit手動保存對象

我花了幾個小時嘗試插入/添加對象，但發生了重複的記錄。廣告系列記錄重新插入，即使它已經存在。我錯過了什麼嗎？RestKit手動保存對象

下面是我的代碼：

Campaign.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];

EDITED 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];

來源

2012-04-30 Teon

是，添加.primaryKeyAttribute到您的映射。當你通過休息套件導入數據時，這將爲你做pk的東西。如果你只是用Restkit做'普通'核心數據的東西，你需要自己處理引用的整合性等。

來源

2012-04-30 14:33:09

我已經用.primaryKeyAttribute更新了我的代碼（請參閱上面的編輯），但是我仍然在活動實體中獲得重複的記錄。它適用於RKObjectManager的loadObjectsAtResourcePath，但不是當我嘗試手動添加對象時。 – Teon

是的。如果你只是在做核心數據的東西，你將需要自己生成id（如果你想要的話）。你不需要它們，因爲設置card.campaign會存儲關係，而核心數據有它自己的內部id，除非你查看sqlite數據庫，否則你不會看到它。您可能需要的唯一原因是您要同步到遠程數據庫並且想與其同步，但是如果您按照我所說的那樣執行操作，則需要自己在代碼中執行該操作。 –

另請參閱http://stackoverflow.com/questions/10264224/auto-index-for-a-coredata-in-objective-c –

RestKit手動保存對象

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