保存後CoreData objectID始終相同

這是我的問題。我創建了一個coreData NSMAnagedObject，保存它，並且它始終使用相同的對象ID創建一個新的對象...這對我沒有任何敏感，因爲我認爲objectID將是唯一的。我必須失去一樣大，在房間裏的大象的東西，但我不能看到它... ...保存後CoreData objectID始終相同

這裏是我的代碼部分：

- (Conversation *) saveImagesToCore:(NSData *)userImage andOtherImage:(NSData *)otherImage { 

NSManagedObjectContext *moc = [(AppDelegate*)[[UIApplication sharedApplication] delegate] managedObjectContext]; 

Message *topMessage = [self saveImageToCore:otherImage 
           andCloudID:self.otherCloudIDsmall 
            andUser:_friendShaker]; 
Message *bottomMessage = [self saveImageToCore:userImage 
            andCloudID:_userCloudID 
             andUser:_currentUser]; 

NSSet *messages = [NSSet setWithArray:@[topMessage, bottomMessage]]; 


NSEntityDescription *entityDescription = [NSEntityDescription entityForName:@"Conversation" 
                inManagedObjectContext:moc]; 

Conversation *newConversation = (Conversation *)[[NSManagedObject alloc] initWithEntity:entityDescription 
                 insertIntoManagedObjectContext:moc]; 

newConversation.dateStarted = [NSDate date]; 
newConversation.isHost = [NSNumber numberWithBool:_currentUserIsCalling]; 
newConversation.user = (User *) _friendShaker.userCoreData; 
[newConversation addMessage:messages]; 

NSError *error = nil; 

if (![newConversation.managedObjectContext save:&error]) { 
    NSLog(@"Unable to save managed object context."); 
    NSLog(@"%@, %@", error, error.localizedDescription); 
} else { 
    NSLog(@"Conversation saved *******"); 
    NSLog(@"Conversation ID %@",[newConversation objectID]); 

    NSDictionary *userInfo = [NSDictionary dictionaryWithObject:newConversation forKey:@"conversation"]; 
    [[NSNotificationCenter defaultCenter] postNotificationName:@"ConversationSaved" object:self userInfo:userInfo]; 
} 

return (Conversation *) newConversation;}

感謝您的幫助。我要瘋了。

這裏是newConversation對象的打印輸出：

<Conversation: 0x16758cd0> (entity: Conversation; id: 0x165073b0 <x-coredata://E31BE071-9ED6-4624-8440-2DC619535A00/Conversation/p7> ; data: { 
allowShareOther = 0; 
allowShareSelf = 0; 
dateLastModified = nil; 
dateStarted = "2015-07-05 15:03:24 +0000"; 
isHost = 1; 
message =  (
    "0x165b1780 <x-coredata://E31BE071-9ED6-4624-8440-2DC619535A00/Message/p14>", 
    "0x165caa00 <x-coredata://E31BE071-9ED6-4624-8440-2DC619535A00/Message/p13>" 
); 
preview = nil; 
type = nil; 
user = "0x16687110 <x-coredata://E31BE071-9ED6-4624-8440-2DC619535A00/User/p3>";})

你會發現我的問題：newConversation對象ID實際上是用戶對象ID。所以每次我創建一個對話時，都有用戶的ObjectID。

來源

2015-07-04 GrandSteph

很抱歉，如果我是鈍的，但我看不到的問題。 'newConversation'打印輸出中顯示它的'objectID'實際上是用戶'objectID'？ – pbasdf

沒錯！我正在讀取ObjectID的錯誤方式。 – GrandSteph

嘗試「提神」的的objectID：

NSPersistentStoreCoordinator *coordinator = [(AppDelegate*)[[UIApplication sharedApplication] delegate] persistentStoreCoordinator]; 
NSURL *uriRep = [newConversation.objectID URIRepresentation]; 
NSManagedObjectID *realID = [coordinator managedObjectIDForURIRepresentation:uriRep]; 

NSLog(@"Conversation ID %@",realID);

來源

2015-07-04 20:47:13 Stavash

同樣的結果。我知道只要NSManaged對象沒有保存，它就有一個臨時ObjectID。但它應該每次創建一個具有相同ObjectID的新實體。 – GrandSteph

保存後CoreData objectID始終相同

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