RestKit与DjangoTastypi的集成

Question

这是我第一个使用RestKit的项目，我试图使我的简单iOS应用程序与Django应用程序使用tastype包提供的API集同步。我的iOS应用程序基于核心数据默认Xcode应用程序。在

我试图从一个简单的模型中检索对象：

Car（名称（字符串）、public（布尔值）、id（整数）、created（datetime））

我的API看起来像：

http://www.example.com/api/v1/car/?format=json

{"meta": {"limit": 20, "next": null, "offset": 0, "previous": null, "total_count": 1}, "objects": [{"created": "2012-07-04T13:47:37+00:00", "id": "1", "name": "BMW", "public": true, "resource_uri": "\/api\/v1\/car\/1\/",}]}

对于1个对象：

http://www.example.com/api/v1/car/1/?format=json

^{pr2}$

在这种情况下，在iOS应用程序中，我已经在我的应用程序委托中配置了我的存储

-(void)configureObjectStore { 
// Initialize the RestKit Object Manager
RKObjectManager *objectManager = [RKObjectManager objectManagerWithBaseURL:[[NSURL alloc] initWithString:@"http://www.example.com/api/v1"]];
objectManager.client.requestQueue.showsNetworkActivityIndicatorWhenBusy = YES;

// Initialize object store
objectManager.objectStore = [RKManagedObjectStore objectStoreWithStoreFilename:@"database.sqlite"];

[self coreDataMapping];
}

并通过应用程序委托在内部设置映射（不确定是否应该在这里…）

- (void)coreDataMapping {
// Now for the object mappings
NSEntityDescription *entity = [NSEntityDescription entityForName:@"Car" inManagedObjectContext:self.managedObjectContext];
RKManagedObjectMapping* carMapping = [RKManagedObjectMapping mappingForEntity:entity inManagedObjectStore:[RKObjectManager sharedManager].objectStore];
[carMapping mapKeyPath:@"id" toAttribute:@"carId"];
[carMapping mapAttributes:@"name", nil];
[carMapping mapKeyPath:@"public" toAttribute:@"public"];
[carMapping mapKeyPath:@"created" toAttribute:@"created"];
carMapping.primaryKeyAttribute = @"carId";

[[RKObjectManager sharedManager].mappingProvider addObjectMapping:carMapping];
}

然后在我的主控制器中，我想在一个表视图中加载我所有的对象（所有的汽车）

- (void)loadData { 
// Load the object model via RestKit
RKObjectManager* objectManager = [RKObjectManager sharedManager];
[objectManager loadObjectsAtResourcePath:@"/car/1/?format=json" usingBlock:^(RKObjectLoader *loader) {
loader.objectMapping = [objectManager.mappingProvider objectMappingForClass:[Car class]];
loader.delegate = self;
}];
}

当我启动我的应用程序并尝试加载对象列表时，它会从委托中触发didFailWithError方法，我有以下堆栈：

I restkit.core_data:RKInMemoryManagedObjectCache.m:34 Creating thread-local entity cache for managed object context: <NSManagedObjectContext: 0x887f1b0>
I restkit.core_data:RKInMemoryManagedObjectCache.m:50 Caching instances of Entity 'Car' by primary key attribute 'carId'
E restkit.core_data:RKManagedObjectStore.m:262 Core Data Save Error
                                NSLocalizedDescription: (null)
                                NSValidationErrorKey: (null)
                                NSValidationErrorPredicate: (null)
                                NSValidationErrorObject: (null)
E restkit.core_data:RKManagedObjectLoader.m:167 Failed to save managed object context after mapping completed: The operation couldn’t be completed. (Cocoa error 134020.)
Hit error: Error Domain=NSCocoaErrorDomain Code=134020 "The operation couldn’t be completed. (Cocoa error 134020.)" UserInfo=0x89612c0 {NSAffectedObjectsErrorKey=<Car: 0x6c85670> (entity: Car; id: 0x6c65790 <x-coredata:///Car/t318CE65F-E4FE-44E1-813B-GEZG54> ; data: {
    created = "2012-07-04 13:47:37 +0000";
    favorites = (); (Note this relation is not mapped in the API but it is not required)
    carId = 1;
    modified = nil;
    name = BMW;
    public = 1;
}), NSUnderlyingException=Store <NSSQLCore: 0x88848c0> (URL: file://localhost/Users/me/Library/Application%20Support/Documents/database.sqlite) cannot hold instances of entity (<NSEntityDescription: 0x886f650>) name Car, managedObjectClassName Car, renamingIdentifier Car, isAbstract 0, superentity name (null), properties {
created = "(<NSAttributeDescription: 0x886dce0>), name created, isOptional 1, isTransient 0, entity Car, renamingIdentifier created, validation predicates (\n), warnings (\n), versionHashModifier (null)\n userInfo {\n}, attributeType 900 , attributeValueClassName NSDate, defaultValue (null)";
favorites = "(<NSRelationshipDescription: 0x886e900>), name favorites, isOptional 1, isTransient 0, entity Car, renamingIdentifier favorites, validation predicates (\n), warnings (\n), versionHashModifier (null)\n userInfo {\n}, destination entity Favorite, inverseRelationship list, minCount 0, maxCount 0, isOrdered 0, deleteRule 1";
carId = "(<NSAttributeDescription: 0x886dd80>), name carId, isOptional 1, isTransient 0, entity Car, renamingIdentifier carId, validation predicates (\n), warnings (\n), versionHashModifier (null)\n userInfo {\n}, attributeType 100 , attributeValueClassName NSNumber, defaultValue 0";
name = "(<NSAttributeDescription: 0x886de20>), name name, isOptional 1, isTransient 0, entity Car, renamingIdentifier name, validation predicates (\n), warnings (\n), versionHashModifier (null)\n userInfo {\n}, attributeType 700 , attributeValueClassName NSString, defaultValue (null)";
public = "(<NSAttributeDescription: 0x886de70>), name public, isOptional 1, isTransient 0, entity Car, renamingIdentifier public, validation predicates (\n), warnings (\n), versionHashModifier (null)\n userInfo {\n}, attributeType 800 , attributeValueClassName NSNumber, defaultValue (null)";
}, subentities (null), userInfo {
}, versionHashModifier (null)}

我试过很多东西，但我觉得我在这里绕圈子。欢迎任何建议。在

感谢您的时间和支持， 谨致问候

PS：我们应该能够排除与RestKit无关的错误，因为在集成之前应用程序运行得很顺利。在

Answer 1

既然这个问题没有得到回答，我将自己回答我是如何处理这些问题的。在

实际上，我已经放弃了RestKit，它当然非常强大，但是我不能充分利用它，因此它可以与Django-tastype一起工作，而我选择了AFNetworking这是不太高级的，但允许我自己对核心数据后端进行API，结果非常方便。在

我希望这能帮助其他失去灵魂的人。 谨致问候