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Problem with fetching relational data

Hi, using the Event and Invitation exemple I have this code:



Model headers:



@interface Event : NSObject

@property (nonatomic, copy) NSString* entityId; //Kinvey entity _id

@property (nonatomic, copy) NSString* name;

@end



@interface Invitation : NSObject

@property (nonatomic, retain) Event* event;

@property (nonatomic, retain) NSString* objectId; //Kinvey entity _id

@end



Model implementations:



@implementation Event

- (NSDictionary *)hostToKinveyPropertyMapping {

return @{

@"entityId" : KCSEntityKeyId, //the required _id field

@"name" : @"name",

};

}

@end



@implementation Invitation

- (NSDictionary *)hostToKinveyPropertyMapping

{

return @{

@"objectId" : KCSEntityKeyId,

@"event" : @"event"

};

}



+ (NSDictionary *)kinveyPropertyToCollectionMapping {

return @{@"event" /* backend field name */ : @"Events" /* collection name for invitations */};

}

@end



The code for fetching is here:



KCSCollection *invitationCollection = [KCSCollection collectionFromString:@"Invitations" ofClass:[Invitation class]];

KCSLinkedAppdataStore *store = [KCSLinkedAppdataStore storeWithCollection:invitationCollection options:nil];



[store queryWithQuery:[KCSQuery query] withCompletionBlock:^(NSArray *objectsOrNil, NSError *errorOrNil) {

if (errorOrNil == nil && objectsOrNil != nil) { //Code for success fetching }

else { //Code for error fetching }

} withProgressBlock:nil];



I always get this error: *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '*** -[__NSPlaceholderDictionary initWithObjects:forKeys:count:]: attempt to insert nil object from objects[1]'



What am I doing wrong? If no Event is related to any of the Invitations stored on Kinvey, I don't have this error. Do I have to implement any other method for translating the KinveyRef dictionary for the original Event entity? Thanks

Hi, this problem is a bug of kinvey ios framework. If you are having problems with that, downgrade KinveyKit to version 1.22.0.
I am getting the exact same error every time I try to resolve a kref as well.
Another information I think it is important: I already save my Invitation object on kinvey with the kinveyRef dictionary for Events collection, but something is wrong when I fetch the Invitation object and the kinveyRef dictionary with the reference for Event property inside Invitation object. I just can't translate this reference:



{"_type":"KinveyRef","_collection":"Events","_id":"52a8c78cdbac155e43eec899"}



to the Event NSObject.
I simply got an error before the data is really dowloaded. Here's the stack:



2013-12-12 14:59:15.477 Zepig[1962:70b] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '*** -[__NSPlaceholderDictionary initWithObjects:forKeys:count:]: attempt to insert nil object from objects[1]'

*** First throw call stack:

(

0 CoreFoundation 0x022705e4 __exceptionPreprocess + 180

1 libobjc.A.dylib 0x01ff38b6 objc_exception_throw + 44

2 CoreFoundation 0x022364c6 -[__NSPlaceholderDictionary initWithObjects:forKeys:count:] + 390

3 CoreFoundation 0x02264029 +[NSDictionary dictionaryWithObjects:forKeys:count:] + 73

4 Zepig 0x0009f30e -[KCSEntityPersistence updateWithEntity:route:collection:] + 1502

5 Zepig 0x00096274 __71-[KCSObjectCache updateObject:entity:route:collection:collectionCache:]_block_invoke + 68

6 libdispatch.dylib 0x032c74b0 _dispatch_client_callout + 14

7 libdispatch.dylib 0x032b4778 _dispatch_barrier_sync_f_invoke + 58

8 libdispatch.dylib 0x032b4422 dispatch_barrier_sync_f + 89

9 libdispatch.dylib 0x032b4943 dispatch_sync + 37

10 Zepig 0x000961a1 -[KCSObjectCache updateObject:entity:route:collection:collectionCache:] + 321

11 Zepig 0x000957cc -[KCSObjectCache setObjects:forQuery:route:collection:] + 956

12 Zepig 0x0006049b -[KCSCachedStore cacheQuery:value:error:policy:] + 347

13 Zepig 0x00060917 __76-[KCSCachedStore queryNetwork:withCompletionBlock:withProgressBlock:policy:]_block_invoke + 103

14 Zepig 0x0005a48b __72-[KCSAppdataStore queryWithQuery:withCompletionBlock:withProgressBlock:]_block_invoke_2 + 43

15 Zepig 0x0005863c __51-[KCSAppdataStore makeProcessDictBlockForNewObject]_block_invoke + 1308

16 Zepig 0x0005a43b __72-[KCSAppdataStore queryWithQuery:withCompletionBlock:withProgressBlock:]_block_invoke + 251

17 Zepig 0x0001cd75 __49-[KCSAsyncConnection connectionDidFinishLoading:]_block_invoke + 885

18 Zepig 0x0001c531 -[KCSAsyncConnection runBlockInForeground:] + 161

19 Zepig 0x0001c9e0 -[KCSAsyncConnection connectionDidFinishLoading:] + 112

20 Foundation 0x01dbdb59 ___NSURLConnectionDidFinishLoading_block_invoke + 40

21 Foundation 0x01d543e1 __65-[NSURLConnectionInternal _withConnectionAndDelegate:onlyActive:]_block_invoke + 62

22 Foundation 0x01bdca6e -[NSURLConnectionInternalConnection invokeForDelegate:] + 119

23 Foundation 0x01bdc9d6 -[NSURLConnectionInternal _withConnectionAndDelegate:onlyActive:] + 208

24 Foundation 0x01bdc8e8 -[NSURLConnectionInternal _withActiveConnectionAndDelegate:] + 76

25 Foundation 0x01bdcc98 _NSURLConnectionDidFinishLoading + 43

26 CFNetwork 0x02709e6f ___ZN27URLConnectionClient_Classic26_delegate_didFinishLoadingEU13block_pointerFvvE_block_invoke + 111

27 CFNetwork 0x02707bac ___ZN27URLConnectionClient_Classic18_withDelegateAsyncEPKcU13block_pointerFvP16_CFURLConnectionPK33CFURLConnectionClientCurrent_VMaxE_block_invoke_2 + 104

28 CFNetwork 0x027520ef ___ZNK17CoreSchedulingSet13_performAsyncEPKcU13block_pointerFvvE_block_invoke + 25

29 CoreFoundation 0x02211d59 CFArrayApplyFunction + 57

30 CFNetwork 0x026715af _ZN19RunloopBlockContext7performEv + 139

31 CFNetwork 0x027526d2 _ZThn16_N19RunloopBlockContext24multiplexerClientPerformEv + 20

32 CFNetwork 0x026713dd _ZN17MultiplexerSource7performEv + 299

33 CFNetwork 0x026711f2 _ZN17MultiplexerSource8_performEPv + 76

34 CoreFoundation 0x021f983f __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 15

35 CoreFoundation 0x021f91cb __CFRunLoopDoSources0 + 235

36 CoreFoundation 0x0221629e __CFRunLoopRun + 910

37 CoreFoundation 0x02215ac3 CFRunLoopRunSpecific + 467

38 CoreFoundation 0x022158db CFRunLoopRunInMode + 123

39 GraphicsServices 0x02ceb9e2 GSEventRunModal + 192

40 GraphicsServices 0x02ceb809 GSEventRun + 104

41 UIKit 0x00d61d3b UIApplicationMain + 1225

42 Zepig 0x0000dddd main + 141

43 libdyld.dylib 0x0355970d start + 1

)

libc++abi.dylib: terminating with uncaught exception of type NSException

(lldb)





Does this method [KCSLinkedAppStore queryWithQuery: withCompletionBlock: withProgressBlock:] is deprecated? There is a warning saying that it is now to use other method:

KCS_DEPRECATED(KCSResourceStore deprecated -- use +[KCSFileStore downloadFileByQuery:completionBlock:progressBlock:] instead, 1.18.0);
What does your data look like? Does it have any malformed relationships? How do you create the reference dictionaries? Also can you provide the whole stack trace?
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