使用RestKit序列化一個對象與子對象[發佈] - 解決

Question

我有以下對象設置：

RKObjectMapping* geoPointMapping = [RKObjectMapping mappingForClass:[CRGeoPoint class]]; 

geoPointMapping.setDefaultValueForMissingAttributes = YES; 
[geoPointMapping mapKeyPathsToAttributes: 
    @"longitude", @"longitude", 
    @"latitude", @"latitude", 
    nil]; 
[objectManager.mappingProvider registerMapping:geoPointMapping withRootKeyPath:@"geometry"]; 

RKObjectMapping* criteriaMapping = [RKObjectMapping mappingForClass:[CRCriteria class]]; 

criteriaMapping.setDefaultValueForMissingAttributes = YES; 
[criteriaMapping mapKeyPathsToAttributes: 
    @"type", @"type", 
    @"geometry", @"geometry", 
    @"fromDate", @"fromDate", 
    @"toDate", @"toDate", 
    @"radius", @"radius", 
    nil]; 
[objectManager.mappingProvider registerMapping:criteriaMapping withRootKeyPath:@"criteria"]; 

但是當我嘗試併發送查詢（用幾何對象）。我保留 得到此錯誤：

收到錯誤錯誤域= JKErrorDomain代碼= -1「無法序列化 對象類CRGeoPoint。」

--------- SOLUTION ----------

該解決方案是雙重的。首先，我必須指定下面指出的Sixten的逆映射，其次我必須指定用於CRCriteria對象上的CRGeoPoint類的映射。以下代碼：

RKObjectMapping* geoPointMapping = [RKObjectMapping mappingForClass:[CRGeoPoint class]]; 

    geoPointMapping.setDefaultValueForMissingAttributes = YES; 

    [objectManager.mappingProvider registerMapping:geoPointMapping withRootKeyPath:@"geometry"]; 

    // Build a serialization mapping by inverting our object mapping. Includes attributes and relationships 
    RKObjectMapping* geoPointSerializationMapping = [geoPointMapping inverseMapping]; 
    // You can customize the mapping here as necessary -- adding/removing mappings 
    [[RKObjectManager sharedManager].mappingProvider setSerializationMapping:geoPointSerializationMapping forClass:[CRGeoPoint class]]; 

    RKObjectMapping* criteriaMapping = [RKObjectMapping mappingForClass:[CRCriteria class]]; 

    criteriaMapping.setDefaultValueForMissingAttributes = YES; 
    [criteriaMapping mapKeyPathsToAttributes: 
    @"type", @"type", 
    @"fromDate", @"fromDate", 
    @"toDate", @"toDate", 
    @"radius", @"radius", 
    nil]; 
    [criteriaMapping mapKeyPath:@"geometry" toRelationship:@"geometry" withMapping:geoPointMapping]; 
    [objectManager.mappingProvider registerMapping:criteriaMapping withRootKeyPath:@"criteria"]; 

    // Build a serialization mapping by inverting our object mapping. Includes attributes and relationships 
    RKObjectMapping* criteriaSerializationMapping = [criteriaMapping inverseMapping]; 
    // You can customize the mapping here as necessary -- adding/removing mappings 
    [[RKObjectManager sharedManager].mappingProvider setSerializationMapping:criteriaSerializationMapping forClass:[CRCriteria class]]; 

Answer 1

入站和出站映射信息由RKObjectMappingProvider單獨處理。您已經在該代碼中配置了入站映射（從您的服務器下載數據）。但是 - RestKit組上的as pointed out by Shane Zatezalo - 您還需要添加RestKit的序列化映射，以瞭解如何將對象轉換爲JSON（或任何其他可能使用的序列化格式）。

查看有關對象序列化的Object Mapping tutorial's部分。看看source for the mapping provider，以確保你自己這些東西是分開的。