restkit：映射to_many与核心数据的关系

Question

我正在创建我的第一个RestKit应用程序。我试图映射to_many与核心数据的关系。

扬声器JSON

{ 
id: 1, 
session_ids: [1,87] 
}, 
{ 
id: 2, 
session_ids: [2,88] 
}, 

映射

sessionEntitiyMapping = [RKEntityMapping mappingForEntityForName:@"Session" inManagedObjectStore:self.managedObjectStore]; 
[sessionEntitiyMapping addAttributeMappingsFromDictionary:@{ 
@"id":    @"session_id", 
}]; 
sessionEntitiyMapping.identificationAttributes = @[ @"session_id" ]; 

speakerEntityMapping = [RKEntityMapping mappingForEntityForName:@"Speaker" inManagedObjectStore:self.managedObjectStore]; 
[speakerEntityMapping addAttributeMappingsFromDictionary:@{ 
@"name":   @"name", 
@"id":    @"speaker_id", 
}]; 

[speakerEntityMapping addPropertyMapping:[RKRelationshipMapping relationshipMappingFromKeyPath:@"session_ids" 
                        toKeyPath:@"sessions" 
                        withMapping:sessionEntitiyMapping]]; 


speakerEntityMapping.identificationAttributes = @[ @"speaker_id" ]; 

错误

终止应用程序由于未捕获的异常 'NSUnknownKeyException'，原因：“[< __NSCFNumb er 0x8569690> valueForUndefinedKey：]：此类不是密钥值，它是密钥id的密钥编码。

Answer 1

我认为问题在于你在模型中使用了一个原语，即session_id有NSInteger类型。不幸的是，您不能使用它，请改用NSNumber。