问题描述
文件说明：
看来我对我的上下文做了一些改变后，调用这两个方法将做同样的事情：discard changes并将更新的对象恢复到其上次提交的值。那么 -reset 实际上是做什么的？
- （void）reset; 会给你一个干净的 NSManagedObjectContext 它和文档状态任何 NSManagedObject '你应该被丢弃，因为他们不再有效。
- （void）rollback 将只是将 NSManagedObject 恢复为它们的持久值
The documentation says:
It seems that after I make some change to my context, calling these two method will do exactly the same thing: discard changes and restore updated objects to their last committed values. So what does -reset actually do?
The key part is in the quote
- (void)reset; will give you a clean NSManagedObjectContext with no objects in it and as the docs state any NSManagedObject's you have around should be discarded as they are no longer valid.
- (void)rollback will just restore the NSManagedObject's to their persisted values
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