获取NSManagedObject的属性作为NSDictionary [英] Get properties of NSManagedObject as NSDictionary

问题描述

如果我有一个从一个上下文中获取的NSManagedObject，那么如何从它的动态属性创建一个NSDictionary，而不仅仅是将每个字段显式复制到字典中呢？

If I have an NSManagedObject I've fetched from a context, how can I create an NSDictionary out of its dynamic properties without just copying each field into the dictionary explicitly?

如果我的托管对象看起来像这样，例如：

If my managed object looks like this, for example:

@implementation Track

@dynamic artist;
@dynamic group;
@dynamic purchase_url;
@dynamic title;
@dynamic file_name;
@dynamic year;

@end

从数据库中提取后，需要一个NSDictionary，它具有与每个@dynamic属性相同的属性。

After fetching from the database, in this case, I need an NSDictionary with the same properties set to each of those @dynamic properties.

推荐答案

有一个更快的方法来转换NSManagedObject到NSDictionary（来自 Matthias Bauch 响应http://stackoverflow.com/a/5664745/2294824 ）：

There is a faster way to convert an NSManagedObject to an NSDictionary (from Matthias Bauch response at http://stackoverflow.com/a/5664745/2294824) :

NSArray *keys = [[[myObject entity] attributesByName] allKeys];
NSDictionary *dict = [myObject dictionaryWithValuesForKeys:keys];

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