RestKit映射對象參考ID

我有一個對象OrganizationalUnit它通過parentId屬性鏈接到父實體。 OrganizationalUnit還具有主鍵屬性或（從JSON「_id」字段映射）。RestKit映射對象參考ID

這是我的代碼：

RKManagedObjectMapping *ouMapping = [RKManagedObjectMapping mappingForClass:[OrganizationalUnit class] inManagedObjectStore:manager.objectStore]; 
[ouMapping mapAttributes:@"name",@"type", nil]; 
[ouMapping mapKeyPath:@"_id" toAttribute:@"ouId"]; 
[ouMapping setPrimaryKeyAttribute:@"ouId"]; 

[ouMapping mapKeyPath:@"parent" toAttribute:@"parentId"]; 

[ouMapping hasOne:@"parent" withMapping:ouMapping]; 
[ouMapping connectRelationship:@"parent" withObjectForPrimaryKeyAttribute:@"parentId"];

其中一期工程在RestKit中發現的例子同樣的方式：

RKManagedObjectMapping* taskMapping = [RKManagedObjectMapping mappingForClass:[Task class] inManagedObjectStore:objectStore]; 
taskMapping.primaryKeyAttribute = @"taskID"; 
[taskMapping mapKeyPath:@"id" toAttribute:@"taskID"]; 
[taskMapping mapKeyPath:@"name" toAttribute:@"name"]; 
[taskMapping mapKeyPath:@"assigned_user_id" toAttribute:@"assignedUserID"]; 
[objectManager.mappingProvider setMapping:taskMapping forKeyPath:@"task"]; 

// Hydrate the assignedUser association via primary key 
[taskMapping hasOne:@"assignedUser" withMapping:userMapping]; 
[taskMapping connectRelationship:@"assignedUser" withObjectForPrimaryKeyAttribute:@"assignedUserID"];

，應在本地創建基於IDS對象之間的關係。

不幸的是，在運行時，當接收到的數據的實際映射正在發生的事情，我得到的錯誤：

*** Terminating app due to uncaught exception 'NSUnknownKeyException', reason: '[<__NSCFString 0x6d9c6f0> valueForUndefinedKey:]: this class is not key value coding-compliant for the key _id.'

任何想法？

來源

2012-06-06 Fr4ncis

你可以發佈你試圖映射的JSON嗎？我有類似的問題與RestKit，可能會在解決方案（請參閱http://stackoverflow.com/questions/13054112/mapping-relationships-in-restkit-through-an-array-of-ids-doesnt-work ） – gummihaf

我想我已經找到了問題的根源，可能是由於孩子們不能引用父母，因爲他們還不存在。

來源

2012-06-06 14:29:58 Fr4ncis

RestKit映射對象參考ID

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