核心数据对象唯一ID [英] core data object unique ID

问题描述

我想为我的托管对象实体模型添加一个唯一的ID字段。

我知道Core Data不使用ID关系， 。我需要一种方法来传递线程安全的数据到不同的线程，这样新的线程然后可以从该数据获取管理对象。

它可以是任何格式，但最好只有一个对象/变量/值。

我可以添加一个CFUUID作为NSString对象，但我不知道这是否理想？我应该做其他的事吗？

欢迎任何选择，或者只是确认CFUUID是要走的路。

as @Carl Veazey提到它：
NSManagedObjectID 正是你正在搜索的！ p>

这里是一个简短的代码片段：

  NSManagedObject * objectInMainContext = .. ..; 
 
 NSManagedObjectID * objectID = objectInMainContext.objectID; 
 dispatch_async（dispatch_get_global_queue（DISPATCH_QUEUE_PRIORITY_DEFAULT，0），^ {
 
 NSManagedObjectContext * newThreadContext = [[NSManagedObjectContext alloc] initWithConcurrencyType：...]; 
 [newThreadContext objectWithID：objectID]; 
 .... 
 .... 
}）; 
  

I'd like to add a unique ID field to my managed object entity model.

I know that Core Data doesn't use ID relationships but this is different. I need a way of passing thread safe data to a different thread so that the new thread can then fetch the managed object from that data.

It can be in any format but ideally just a single object/variable/value.

I could add a CFUUID to the object as an NSString but I'm not sure if this is ideal? Should I be doing something else?

Any alternatives are welcome, or even just confirmation that CFUUID is the way to go.

解决方案

as @Carl Veazey mention it: The NSManagedObjectID is exactly what are you searching for!

and here ist a short snippet:

  NSManagedObject *objectInMainContext = ....;

  NSManagedObjectID *objectID = objectInMainContext.objectID;
  dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{

    NSManagedObjectContext *newThreadContext = [[NSManagedObjectContext alloc] initWithConcurrencyType: ... ];    
    [newThreadContext objectWithID: objectID];
    ....
    ....
  });

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