Rails RestKit POST 请求 json 的根类丢失

Question

我之前遇到过这个问题，但我已经修复了，但我知道修复方法肯定没有正确完成。有人可以指出我正确的方向以进行正确的修复吗？

基本上，我通过 RESTkit postObject 使用 iOS sim 创建一个对象，然后收到以下消息：

Processing PeopleController#create (for 127.0.0.1 at 2012-01-13 03:55:46) [POST]
  Parameters: {"name"=>"data"}

Person Create (0.4ms)   INSERT INTO "people" ("created_at", "updated_at", "name")
VALUES('2012-01-13 11:55:46', '2012-01-13 11:55:46', NULL)
Completed in 27ms (View: 1, DB: 0) | 200 OK 

一位好心的绅士指出，我的 create 函数中的类仅接受 :person我忽略的班级。

def create
@person = Person.new(params[:person]) , thus looking for {"person" => {"name"=>"data"}}

我通过执行

@person =Person.new(name:=>params[:name]) 解决了这个问题，因为我只发送 {"name"=>"data"}< /代码> 现在它创建好了，我可以在我的 ios sim 上看到该条目。但我知道这不是正确的方法。正确的方法应该是 {"person" =>; {"name"=="data"}} 发送到原始函数。另外，我收到错误无法找到 keyPath 的对象映射：“。有什么想法吗？

这是我的 xcode：

@interface Data: NSObject{// imaginary over arching class
   Person * person;
   NSArray *dog;
@property (nonatomic, retain) Person * person;
@property (nonatomic, retain) NSArray * dog;

@interface Data : NSObject {
Person *person;
NSArray *dogs;
}
@property (nonatomic ,retain) Person *person;
@property (nonatomic ,retain) NSArray *dogs;
@end

@interface Person : NSObject {

NSString *name;
NSNumber *personId;
NSDate   *updatedAt;
NSDate   *createdAt;

}

@property (nonatomic , retain) NSDate * createdAt;
@property (nonatomic , retain) NSDate * updatedAt;
@property (nonatomic , retain) NSNumber  *personId;
@property (nonatomic , retain) NSString *name;
@end

RKObjectMapping* userMapping = [RKObjectMapping mappingForClass:[Person class]];

[userMapping mapKeyPath:@"created_at" toAttribute:@"createdAt"];
[userMapping mapKeyPath:@"updated_at" toAttribute:@"updatedAt"];
[userMapping mapKeyPath:@"name" toAttribute:@"name"]; 
[userMapping mapKeyPath:@"id" toAttribute:@"personId"];

RKObjectMapping* dogMapping = [RKObjectMapping mappingForClass:[Dog class]];
[dogMapping mapKeyPath:@"created_at" toAttribute:@"createdAt"]; 
[dogMapping mapKeyPath:@"person_id" toAttribute:@"spersonId"]; 
[dogMapping mapKeyPath:@"name" toAttribute:@"name"]; 
[dogMapping mapKeyPath:@"updated_at" toAttribute:@"updatedAt"]; 
[dogMapping mapKeyPath:@"id" toAttribute:@"dogId"]; 

RKObjectMapping *dataMapping = [RKObjectMapping mappingForClass:[Data class]]; 
[dataMapping mapKeyPath:@"dog" toAttribute:@"dogs"]; 
[dataMapping mapKeyPath:@"person" toRelationship:@"person" withMapping:userMapping]; 
[[RKObjectManager sharedManager].mappingProvider addObjectMapping:dataMapping]; 

[[RKObjectManager sharedManager] loadObjectsAtResourcePath:@"/people"       
objectMapping:dataMapping delegate:self]; 

RKObjectRouter * router = [RKObjectManager sharedManager].router;
[router routeClass: [Person class] toResourcePath:@"/people/:personId"];
[router routeClass: [Person class] toResourcePath:@"/people"          
forMethod:RKRequestMethodPOST];

RKObjectMapping *personSerializationMapping = [RKObjectMapping mappingForClass:
[NSMutableDictionary class]];
[personSerializationMapping attribute:@"name", nil];
[RKObjectManager sharedManager].mappingProvider 
setSerializationMapping:personalSerializationMapping forClass: [Person class]];

Person *dave = [[Person alloc]init];
dave.name = @"Dave";
[[RKObjectManager sharedManager] postObject:dave delegate:self];
}

Answer 1

以 Person 为例：

RKObjectMapping* userMapping = [RKObjectMapping mappingForClass:[Person class]];

[userMapping mapKeyPath:@"created_at" toAttribute:@"createdAt"];
[userMapping mapKeyPath:@"updated_at" toAttribute:@"updatedAt"];
[userMapping mapKeyPath:@"name" toAttribute:@"name"]; 
[userMapping mapKeyPath:@"id" toAttribute:@"personId"];

要将 RestKit 配置为带有根路径的 POST，请将： 替换

[[[RKObjectManager sharedManager] mappingProvider] 
         setSerializationMapping:personalSerializationMapping 
                        forClass:[Person class]];

为：

[[[RKObjectManager sharedManager] mappingProvider]
                 registerMapping:objectMapping 
                 withRootKeyPath:@"person"];

现在 Rails 将收到 {"人”=> {"name"=>"data"}} 而不是 {"name"=>"data"}。

作为参考，这里是 registerMapping 的魔力：

- (void)registerObjectMapping:(RKObjectMapping *)objectMapping withRootKeyPath:(NSString *)keyPath {
    // TODO: Should generate logs
    objectMapping.rootKeyPath = keyPath;
    [self setMapping:objectMapping forKeyPath:keyPath];
    RKObjectMapping* inverseMapping = [objectMapping inverseMapping];
    inverseMapping.rootKeyPath = keyPath;
    [self setSerializationMapping:inverseMapping forClass:objectMapping.objectClass];
}

它通过巧妙的 实现 setMapping 和 setSerializationMapping [objectMapping inverseMapping] 技巧。

Answer 2

是的，终于想通了。映射是错误的。它应该是 userMapping 和 keyPath person，而不是 addObjectMapping: dataMapping，即 userMapping。顺便说一句，thnx @favo 编辑我的鸡抓痕 =] 现在它可以 GET 和 POST 很好！

Answer 3

为了完成，关于“无法找到关键路径''的映射”的错误似乎是Rails创建操作的问题。

这个问题有一个很好的答案：如何使用 RESTKit 将对象发布到 Rails