Restkit：从核心数据获取到服务器的 POST 对象数组

Posted 2023-03-05

【中文标题】Restkit：从核心数据获取到服务器的 POST 对象数组

【英文标题】：Restkit: POST array of objects fetched from Core Data to server

【发布时间】：2012-06-18 21:52:28

【问题描述】：

我似乎在将一组核心数据对象发布到服务器时遇到了一些问题。 RestKit 使 GET 请求变得非常容易，但在发布时就不那么容易了。

这是服务器想要 JSON 的方式

   "myThingList":[
      
       "id":"0",
       "code":"8406014415007DC8",
       "timestamp":"2012-05-11-12.30.15.505000",
       "status":"0",
       "userId":"8000000",

      
  ]

我在 Core Data 中有一个 THING 类，它最多可以容纳 200 个东西。我需要一次将所有这些发送到服务器。当然，我从 CD 获取后的 NSArray 只是一个 Array of THINGS。

下面是我的代码。我得到 [valueForUndefinedKey:]: 这个类不符合键 theId 的键值编码。'

RKManagedObjectMapping *thingMapping = [ RKManagedObjectMapping mappingForClass:[thingMapping class] 
                                                                      inManagedObjectStore:self.objectManager.objectStore ];
[thingMapping mapKeyPath:@"id" toAttribute:@"theId"];
[thingMapping mapKeyPath:@"code" toAttribute:@"code"];
...... the rest of the fields in Thing

[self.objectManager.mappingProvider setMapping:thingMapping forKeyPath:@"myThingList"];

attendReadMapping.primaryKeyAttribute = @"theId";


[self.objectManager.mappingProvider setSerializationMapping:[thingMapping inverseMapping] forClass:[Things class]];

//now, we create mapping for the MySyncEntity
RKObjectMapping *syncEntityMapping = [RKObjectMapping mappingForClass:[MySyncEntity class]];
[syncEntityMapping mapKeyPath:@"mySyncArray" toRelationship:@"mySyncArray" withMapping:thingMapping];
[[self.objectManager mappingProvider] setSerializationMapping:[syncEntityMapping inverseMapping]
                                          forClass:[MySyncEntity class]];




MySyncEntity *mySyncInstance = [[MySyncEntity alloc] init];
mySyncInstance.mySyncArray = things;


NSString *url = [NSString stringWithFormat:@"things];

if ( [things count] > 0 ) 
    [self.objectManager sendObject:mySyncInstance toResourcePath:url usingBlock:^(RKObjectLoader* postLoader) 
        postLoader.delegate = aDelegate;
        postLoader.method = RKRequestMethodPOST;
        postLoader.userData = @"howdy";
        postLoader.serializationMIMEType = RKMIMETypeJSON; 
        [postLoader setUsername:[prefs objectForKey:@"me"]];
        [postLoader setPassword:[prefs objectForKey:@"me"]];


        postLoader.targetObject = nil;  // Map the results back onto a new object instead of self
];

【参考方案1】：

发现问题。下面需要改一下

** OLD **
 [syncEntityMapping mapKeyPath:@"mySyncArray" toRelationship:@"mySyncArray" withMapping:thingMapping];


** NOW **
[syncEntityMapping mapKeyPath:@"myThingList" toRelationship:@"myThingList" withMapping:thingMapping];

MySyncEntity 类还需要将其 NSArray Prop 更改为同名“myThingList”而不是“mySyncArray”

还有这个

mySyncInstance.mySyncArray = things;

需要

mySyncInstance.myThingList = things;