CoreData：从未保存的上下文中获取对象 [英] CoreData: Fetching an Object from an unsaved Context

问题描述

在我插入一个ManagedObject到上下文中，我想在稍后但在保存上下文之前提取它（我会在所有对象插入后保存）。看起来，如果上下文之前未保存，则稍后使用关于这些对象的提取查询上下文不会返回任何内容。
有没有办法只保存到最后？（我想我可以保存我的对象在数组或字典和查询，但我认为coredata会为我这样做）

after I insert a ManagedObject into a context I'd like to fetch it later but before saving the context (I'd save after all objects are inserted). It appears that querying the context later with a fetch concerning those objects returns nothing if the context wasn't previously saved. Is there a way to save only in the end ?(I guess i can save my objects in an array or dictionary and query that but i thought coredata would do this for me)

推荐答案

尝试：

[myFetchRequest setIncludesPendingChanges:YES];

从文档：

设置当执行提取时，是否与托管对象上下文中当前未保存的更改匹配。

Sets if, when the fetch is executed, it matches against currently unsaved changes in the managed object context.

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