集合和amp;amp;lt;NSCFSet:0x1b0b30和amp;gt;在枚举时发生了突变.确定哪个集合?

我正在做一堆核心数据插入，在 20k 左右插入后每 1-2k 保存一次，我收到此错误:

I'm doing a bunch of core data inserts and after 20k or so inserts with saves every 1-2k I get this error:

Terminating app due to uncaught exception 'NSGenericException', reason: '*** Collection <NSCFSet: 0x1b0b30> was mutated while being enumerated.'

我想弄清楚是哪个 NSSet 导致了这种情况.我进行了搜索，我的代码中唯一的 NSSet 是处理核心数据关系的自动生成的.

I'm trying to figure out which NSSet is causing this. I've done a search and the only NSSets in my code are the autogenerated ones that handle the Core Data relationships.

我正在使用 NSXMLParser 并为找到的每个元素创建一个新实体(如果匹配的实体尚不存在).

I'm using NSXMLParser and for each element found creating a new entity (if a matching one doesn't already exist).

所以我将创建一个状态实体，然后填充所有城市实体，然后进行保存.这意味着一个州的 NSSet *cities 正在被添加，但我不明白你为什么不能这样做.

So I will create a state entity and then populate all the city entities and then do a save. This means that a state's NSSet *cities is getting added to but I don't see why you can't do that.