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PORestkit 0.20 pre4 core data issue
 

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    <pre><code>{"status":"ok", "count":5, "count_total":165, "pages":33, "posts":[{ "id":2971, "status":"publish", "title":"title1", "content":"", "date":"date", "categories":[{"id":5, "title":"category1"}, {"id":7, "title":"category2"}], "thumbnail":"url", "custom_fields":{"wpcf-content":["content"], "wpcf-audio":["url"]} }, { "id":2974, "status":"publish", "title":"title2", "content":"", "date":"date2", "categories":[{"id":5, "title":"category1"}, {"id":5, "title":"category3"} ], "thumbnail":"url", "custom_fields":{"wpcf-content":["content"], "wpcf-audio":["url"]} } ] } posts.h @interface posts : NSManagedObject @property (nonatomic, retain) NSString* title; @property (nonatomic, retain) NSArray* wpcf-content; @property (nonatomic, retain) NSArray* wpcf-audio; @property (nonatomic, retain) NSString* id; @property (nonatomic, retain) NSArray* categories; @end categories.h @interface categories : NSManagedObject @property (nonatomic, retain) NSString* title; @end Model.xcdatamodeld entities Posts : title (string), id (integer 64),wpcf-audio (transformable),wpcf-content (transformable) Categories : title (string) NSManagedObjectModel *managedObjectModel = [NSManagedObjectModel mergedModelFromBundles:nil]; RKManagedObjectStore *managedObjectStore = [[RKManagedObjectStore alloc] initWithManagedObjectModel:managedObjectModel]; NSString *path = [RKApplicationDataDirectory() stringByAppendingPathComponent:@"Model.sqlite"]; [managedObjectStore addSQLitePersistentStoreAtPath:path fromSeedDatabaseAtPath:nil withConfiguration:nil options:nil error:nil]; [managedObjectStore createManagedObjectContexts]; RKEntityMapping *categoryMapping = [RKEntityMapping mappingForEntityForName:@"Categories" inManagedObjectStore:managedObjectStore]; [categoryMapping addAttributeMappingsFromDictionary:@{ @"title":@"title"}]; RKEntityMapping *mapping = [RKEntityMapping mappingForEntityForName:@"Posts" inManagedObjectStore:managedObjectStore]; NSArray *identification =[[NSArray alloc]initWithObjects:@"id", nil]; mapping.identificationAttributes= identification; [mapping addAttributeMappingsFromArray:@[@"title",@"id",@"custom_fields.wpcf-content",@"custom_fields.wpcf-audio"]]; NSIndexSet *statusCodes = RKStatusCodeIndexSetForClass(RKStatusCodeClassSuccessful); // Anything in 2xx RKResponseDescriptor *responseDescriptor = [RKResponseDescriptor responseDescriptorWithMapping:mapping pathPattern:nil keyPath:@"posts" statusCodes:statusCodes]; [mapping addPropertyMapping:[RKRelationshipMapping relationshipMappingFromKeyPath:@"categories" toKeyPath:@"categories" withMapping:categoryMapping]]; NSURLRequest *request = [NSURLRequest requestWithURL:[NSURL URLWithString:@"http://my.url/json"]]; RKManagedObjectRequestOperation *operation = [[RKManagedObjectRequestOperation alloc] initWithRequest:request responseDescriptors:@[responseDescriptor]]; operation.managedObjectContext = managedObjectStore.mainQueueManagedObjectContext; [operation setCompletionBlockWithSuccess:^(RKObjectRequestOperation *operation, RKMappingResult *result) { posts *article = [result firstObject]; categories *catego =[article.categories objectAtIndex:0]; NSLog(@"Mapped the article: %@", article.title); NSLog(@"Mapped the article: %@", catego.title); } failure:^(RKObjectRequestOperation *operation, NSError *error) { NSLog(@"Failed with error: %@", [error localizedDescription]); }]; RKObjectManager *manager = [RKObjectManager managerWithBaseURL:[NSURL URLWithString:@"http://my.url/"]]; [manager enqueueObjectRequestOperation:operation]; </code></pre> <p>I get this error W restkit.core_data:RKManagedObjectMappingOperationDataSource.m:157 Performing managed object mapping with a nil managed object cache:</p> <p>Unable to update existing object instances by identification attributes. Duplicate objects may be created.</p>
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