![relationships]( "relationships")
本文介绍了删除不会nulled直到保存：是真的吗？的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我的情况：我在核心数据中有复杂的（24个实体，许多关系和许多有序到多个关系）模型。
现在让我们说，我有一个实体 PlayList 和实体 Song ，在 PlayList 与 Song 的有序对多关系。这个关系有一个逆，并且都有一个 nullify 删除规则。
我注意到，当我删除属于 PlayList的 Song （让我们称为 gangnam c>，这首歌不会从关系中删除！我尝试用以下方法解决这个问题：
- 我修复了与多对有序关系相关的Apple的错误， a href =https://github.com/CFKevinRef/KCOrderedAccessorFix =nofollow> KCOrderedAccessorFix 。顺便说一下，如果你使用其他解决方案，要小心，因为错误不仅是对于
addAnObject 部分，而且对于 removeAnObject 部分。 结果：好多了，但仍然无法工作：我的关系还指 gangnam ：（
- ：
processPendingChanges ：无效。
，
因此，我的问题是：
如果我想要 save > nullify 关系？
或者我缺少某些东西？
我试图重现bug一个较小的模型，但在这种情况下，调用 processPendingChanges 就足以 nullify 同样的问题/情况，我很高兴地知道，我不是唯一一个与核心数据;）
战斗 =h2_lin>解决方案由于一个原因，实体的图形是不一致的（ CoreData 的一个错误）它们的逆不被适当地保持）。所以，它拒绝删除对象。如果我保存，它首先使图形一致，然后可以删除该对象。
My situation : I have complex (24 entities, many relationships and many ordered to-many relationships) model in Core Data.
Now let's say, I have an entity PlayList and an entity Song, and in PlayList an ordered to-many relationship to Song. This relationship has an inverse, and both have a nullify delete-rule.
I have remarked that when I delete a Song (let's call it gangnam) that belongs to a PlayList, this song is not removed from the relationship !! I tried to fix this with the following :
- I fixed the Apple's bug related to the to-many ordered relationships, using the excellent : KCOrderedAccessorFix. By the way, be careful if you use other solutions, because the bug is not only for the
addAnObject part but also for the removeAnObject part. Result : much better but still not working : my relationship still refers to gangnam :( - I tried :
processPendingChanges : not working.
Now,
- If I
save my context, the Song gangnam is removed.
So, my question is :
Do I have to save my context if I want to nullify the relationships ?Or am I missing something ?
I tried to reproduce the "bug" with a smaller model, but in this case, calling processPendingChanges is enough to nullify the relationship. So, if anyone has encountered the same problem/situation, I would be happy to know that I am not the only one to fight with Core Data ;)
解决方案
For a reason, the graph of the entities was not coherent (some bug of CoreData I guess, the relations and their inverse are not properly maintained). So, it refuses to delete the object. If I save, it first makes the graph coherent and then it is possible to remove the object.
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