如何将NSManagedObject转换为NSDictionary [英] How to convert NSManagedObject to NSDictionary

问题描述

我试图将 NSManagedObject 转换为 NSDictionary 这是我尝试：

I am trying to convert NSManagedObject to NSDictionary this is what I tried:

var keys:NSArray = order?.entity.attributesByName.keys
var dict:NSDictionary = order?.dictionaryWithValuesForKeys(keys)

但我收到错误：

 LazyForwardCollection<MapCollectionView<Dictionary<NSObject,
 AnyObject>, NSObject>>? is not convertible to NSArray.

我在这里做错了什么？

推荐答案

字典的键属性返回 LazyForwardCollection 转换为实数数组。

The keys property of a dictionary returns a LazyForwardCollection which has to be converted to a real array.

另一个问题是， order 显然是一个可选项，因此需要
才能解开。可选绑定。

Another problem is that order is apparently an optional, so it needs to be unwrapped, e.g. with optional binding.

if let theOrder = order {
    let keys = Array(theOrder.entity.attributesByName.keys)
    let dict = theOrder.dictionaryWithValuesForKeys(keys)
} else {
    // order is nil
}

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