將一個對象映射到兩個類的CoreData

因此，這是我第一次嘗試將對象映射到CoreData中，我認爲它是正確的，但我沒有幾個問題。首先，我只是不知道我是否以正確的方式進行了映射，其次是我得到了成功響應，但沒有映射對象。將一個對象映射到兩個類的CoreData

我有2個對象DbRestError & DbRestCategory。 DbRestError包含來自服務器的錯誤，並且DbRestCategory包含類別本身。都是從相同的響應回來，但RestKit似乎無法映射它們。

這些都是對象：

DbRestError

@interface DbRestError : NSManagedObject 

@property (nonatomic, retain) NSNumber * statusCode; 
@property (nonatomic, retain) NSString * errorTitle; 

@end

DbRestCategory

@interface DbRestCategory : NSManagedObject 

@property (nonatomic, retain) NSString * title; 
@property (nonatomic, retain) NSNumber * idNum; 

@end

這是我初始化我CoreData與RestKit：

- (void)setup 
{ 
    self.objectStore = [[RKManagedObjectStore alloc] initWithManagedObjectModel:[self managedObjectModel]]; 

    NSString *path = [RKApplicationDataDirectory() stringByAppendingPathComponent:@"database.sqlite"]; 
    NSLog(@"Setting up store at %@", path); 
    [self.objectStore addSQLitePersistentStoreAtPath:path 
           fromSeedDatabaseAtPath:nil 
            withConfiguration:nil 
              options:@{ NSInferMappingModelAutomaticallyOption: @YES, NSMigratePersistentStoresAutomaticallyOption: @YES } 
               error:nil]; 

    [self.objectStore createManagedObjectContexts]; 
}

這是我初始化我RestKit客戶端：

- (void)initRestClient 
{ 
    NSURL *baseURL = [NSURL URLWithString:kWebServiceBaseURL]; 
    self.manager = [RKObjectManager managerWithBaseURL:baseURL]; 
    [self.manager setRequestSerializationMIMEType:RKMIMETypeJSON]; 
    [self.manager setAcceptHeaderWithMIMEType:RKMIMETypeJSON]; 
    [self.manager addResponseDescriptorsFromArray:[RKObjectManager sharedManager].responseDescriptors]; 
    [self.manager addRequestDescriptorsFromArray:[RKObjectManager sharedManager].requestDescriptors]; 
    [self.manager.HTTPClient.operationQueue setMaxConcurrentOperationCount:MAX_CONCURRENT_OPERATION_COUNT]; 
    [self.manager setManagedObjectStore:[[MainDb sharedDb] objectStore]]; 

    [RKObjectManager setSharedManager:self.manager]; 

    self.requestMethod = RKRequestMethodGET; 
    self.statusCode = RKStatusCodeIndexSetForClass(RKStatusCodeClassSuccessful); 

    RKRoute *categoriesRoute = [RKRoute routeWithClass:[DbRestCategory class] pathPattern:kGetCategories method:self.requestMethod]; 
    categoriesRoute.shouldEscapePath = YES; 
    [self.manager.router.routeSet addRoute:categoriesRoute]; 

    // @@yosi -- Error Mapping 
    // 
    // 
    RKEntityMapping *errorMapping = [RKEntityMapping mappingForEntityForName:@"DbRestError" inManagedObjectStore:[[MainDb sharedDb] objectStore]]; 
    [errorMapping addAttributeMappingsFromDictionary:@{ @"statusCode" : @"statusCode", @"description" : @"errorTitle" }]; 

    // @@yosi -- Categories Mapping 
    // 
    // 
    RKEntityMapping *categoryMapping = [RKEntityMapping mappingForEntityForName:@"DbRestCategory" inManagedObjectStore:[[MainDb sharedDb] objectStore]]; 
    [categoryMapping addAttributeMappingsFromDictionary:@{ @"id" : @"idNum", @"name" : @"title" }]; 

    RKObjectMapping *categoriesMapping = [RKObjectMapping mappingForClass:[RestCategories class]]; 
    [categoriesMapping addRelationshipMappingWithSourceKeyPath:@"categories" mapping:categoryMapping]; 
    [categoriesMapping addPropertyMapping:[RKRelationshipMapping relationshipMappingFromKeyPath:@"error" toKeyPath:@"error" withMapping:errorMapping]]; 

    [[RKObjectManager sharedManager] addResponseDescriptor:[RKResponseDescriptor responseDescriptorWithMapping:categoriesMapping 
                             method:self.requestMethod 
                            pathPattern:kGetCategories 
                             keyPath:nil 
                            statusCodes:self.statusCode]]; 
}

這就是我正在做的請求本身：

[[RKObjectManager sharedManager] getObject:[[DbRestCategory alloc] init] path:nil parameters:nil success:^(RKObjectRequestOperation *operation, RKMappingResult *mappingResult) { 

} failure:^(RKObjectRequestOperation *operation, NSError *error) { 

}];

這是怎樣的JSON看起來像：

{ 
error: { 
statusCode: 10, 
description: "success" 
}, 
categories: [ 
    { 
     id: "3", 
    name: "cate 3" 
    }, 
    { 
     id: "4", 
    name: "cate 4" 
    }, 
    { 
     id: "5", 
    name: "cate 5" 
    }, 
    { 
     id: "1", 
    name: "cate 1" 
    }, 
    { 
     id: "6", 
    name: "cate 6" 
    }, 
    { 
     id: "2", 
    name: "cate 2" 
    } 
      ] 
}

有人可以幫我理解爲什麼我沒有任何物體得到迴應嗎？

來源

2014-09-25 Yossi Tsafar

'error'和'categories'正在相同的響應。你爲什麼使用方法'getObject'而不是'getObjectsAtPath'？您可以添加兩個響應描述符映射這兩個實體。 – 2014-09-26 06:47:35

@AnushaK是的，我做到了，但仍然無法正常工作。現在我收到了這個錯誤：https：//groups.google.com/forum/#!topic/restkit/2u5Ke_FnaZU – 2014-09-26 11:03:27

嘗試請求映射像這樣，

// Request Mapping 

// Map error 
RKEntityMapping *errorMapping = [RKEntityMapping mappingForEntityForName:@"DbRestError" inManagedObjectStore:[[MainDb sharedDb] objectStore]]; 
[errorMapping addAttributeMappingsFromDictionary:@{ @"statusCode" : @"statusCode", @"description" : @"errorTitle" }]; 
[[RKObjectManager sharedManager] addResponseDescriptor:[RKResponseDescriptor responseDescriptorWithMapping:errorMapping method:self.requestMethod pathPattern:kGetCategories keyPath:@"error" statusCodes:self.statusCode]]; 

// Map Category 
RKEntityMapping *categoryMapping = [RKEntityMapping mappingForEntityForName:@"DbRestCategory" inManagedObjectStore:[[MainDb sharedDb] objectStore]]; 
[categoryMapping addAttributeMappingsFromDictionary:@{ @"id" : @"idNum", @"name" : @"title" }]; 

[[RKObjectManager sharedManager] addResponseDescriptor:[RKResponseDescriptor responseDescriptorWithMapping:categoriesMapping method:self.requestMethod pathPattern:kGetCategories keyPath:@"categories" statusCodes:self.statusCode]];

來源

2014-09-29 10:56:33

將一個對象映射到兩個類的CoreData

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