我有一个“i”项目,在这个项目中,我有一系列在主要应用线内的经控物体。 在一条单独的路上,我从一个网络服务器进口新的物体,进入第二个受控物体。
如果进口不出现错误,我就没有进口环境。 这引发背景 DidSave from which 我请jointChangesFromContextDidSaveNotification/code>。 这两种情况混在一起。 迄今为止,情况良好。
我所希望的功用是,删除原MOC但进口的MOC中的任何物体(其想法是用户正在更新数据,因此旧数据应当删除),但合并似乎只是把2个MOC合并。
请告诉你,是否有办法管理2个摩托车的合并,以便删除其中1个。
当你制造新 mo时,它能够接触所有旧物体,以便你能够处理作为进口一部分的背景删除。
你描述的不是真正的进口。 确定哪些物体为“更新”的逻辑是具体适用的。 你们可以通过 objects取这些物体并更新这些物体,而不是制造新的事例,或者你在会后能够做这些工作,来应对进口问题。 在这两种选择中,我倾向于第一个选择,因为它更符合核心数据方法。
What I do in such situation, is a method "prepareForDelet" that marks a property "delete" to YES. Then when I import my objects, if one exists already, I mark as delete NO. When my thread is over, I can delete every objects whose delete is YES
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我希望我与四舍五入的累进角进行网上讨论。
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