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我試圖從http json資源（類別列表）中獲取內容並將其與restkit和coredata連接起來。無法使Restkit 0.20 + CoreData工作
當我沒有使用CoreData時，我的映射用於工作。然後，我決定用下面的教程：
http://www.alexedge.co.uk/portfolio/introduction-restkit-0-20/
但是，我得到一個奇怪的錯誤，我只是不能找出原因：
the entity (null) is not key value coding-compliant for the key "remoteId"
我的分類模型/實體具有映射remoteId到我的服務器上的ID，所以這不是問題。然而，從錯誤似乎Restkit或CoreData無法弄清楚，我說的是實體（他們說，這是一個空實體??）
這是請求代碼：
- (NSFetchedResultsController *)fetchedResultsController{
if (!_fetchedResultsController) {
NSFetchRequest *fetchRequest = [NSFetchRequest fetchRequestWithEntityName:NSStringFromClass([Category class])];
fetchRequest.sortDescriptors = @[[NSSortDescriptor sortDescriptorWithKey:@"name" ascending:YES]];
self.fetchedResultsController = [[NSFetchedResultsController alloc] initWithFetchRequest:fetchRequest managedObjectContext:[RKManagedObjectStore defaultStore].mainQueueManagedObjectContext sectionNameKeyPath:nil cacheName:@"Category"];
self.fetchedResultsController.delegate = self;
NSError *error;
[self.fetchedResultsController performFetch:&error];
NSLog(@"%@",[self.fetchedResultsController fetchedObjects]);
NSAssert(!error, @"Error performing fetch request: %@", error);
}
return _fetchedResultsController;
}
而且映射：
+(void) prepareMapping {
RKObjectManager *manager = [RKObjectManager sharedManager];
NSDictionary *categoryAttributes = @{
@"id" : @"remoteId",
@"created_at" : @"updatedAt",
@"created_at" : @"createdAt",
@"name" : @"name",
@"ads_count": @"adsCount",
};
RKEntityMapping *categoryMapping = [RKEntityMapping mappingForEntityForName:@"Category" inManagedObjectStore:manager.managedObjectStore];
[categoryMapping addAttributeMappingsFromDictionary:categoryAttributes];
categoryMapping.identificationAttributes = @[@"remoteId"];
[manager addResponseDescriptorsFromArray:@[
[RKResponseDescriptor responseDescriptorWithMapping:categoryMapping
pathPattern:@"neighborhoods/:neighborhoodId/categories.json"
keyPath:@"index_categories.index_category"
statusCodes:RKStatusCodeIndexSetForClass(RKStatusCodeClassSuccessful)]
]];
}