Core data 从两个NSManagedObject获取属性,并将其另存为另一个的属性
在我的应用程序的新版本中,我希望合并两个不同NSManagedObject上的两个属性,并在这两个对象的关系上使用它 例如,我有一个对象“Document”(在更新的版本中现在有“title”属性),这个对象与一个“book”和一个“约会”相关,这两个对象过去都有“title”属性 Core Data programming guide(核心数据编程指南)阅读起来非常混乱,根据我的能力,我必须执行/覆盖自定义迁移 我的模型迁移得很好,除了这段数据。有人能告诉我更新这个属性的正确方向吗 谢谢 我的意思是: 我的旧型号Core data 从两个NSManagedObject获取属性,并将其另存为另一个的属性,core-data,core-data-migration,Core Data,Core Data Migration,在我的应用程序的新版本中,我希望合并两个不同NSManagedObject上的两个属性,并在这两个对象的关系上使用它 例如,我有一个对象“Document”(在更新的版本中现在有“title”属性),这个对象与一个“book”和一个“约会”相关,这两个对象过去都有“title”属性 Core Data programming guide(核心数据编程指南)阅读起来非常混乱,根据我的能力,我必须执行/覆盖自定义迁移 我的模型迁移得很好,除了这段数据。有人能告诉我更新这个属性的正确方向吗 谢谢 我的
+--------------------+ +--------------------+ +--------------------+
| Book | | Appointment | | Document |
+--------------------+ +--------------------+ +--------------------+
| - Title | | - Title | | - Date Added |
| - Date Added | | - Date Added | | - Date Modified |
| - Date Modified | | - Date Modified | +--------------------+
+--------------------+ +--------------------+ | (Relationships) |
| (Relationships) | | (Relationships) | +--------------------+
+--------------------+ +--------------------+
+--------------------+ +--------------------+ +--------------------+
| Book | | Appointment | | Document |
+--------------------+ +--------------------+ +--------------------+
| - Date Added | | - Date Added | | - Title |
| - Date Modified | | - Date Modified | | - Date Added |
+--------------------+ +--------------------+ | - Date Modified |
| (Relationships) | | (Relationships) | +--------------------+
+--------------------+ +--------------------+ | (Relationships) |
+--------------------+
我的新车型
+--------------------+ +--------------------+ +--------------------+
| Book | | Appointment | | Document |
+--------------------+ +--------------------+ +--------------------+
| - Title | | - Title | | - Date Added |
| - Date Added | | - Date Added | | - Date Modified |
| - Date Modified | | - Date Modified | +--------------------+
+--------------------+ +--------------------+ | (Relationships) |
| (Relationships) | | (Relationships) | +--------------------+
+--------------------+ +--------------------+
+--------------------+ +--------------------+ +--------------------+
| Book | | Appointment | | Document |
+--------------------+ +--------------------+ +--------------------+
| - Date Added | | - Date Added | | - Title |
| - Date Modified | | - Date Modified | | - Date Added |
+--------------------+ +--------------------+ | - Date Modified |
| (Relationships) | | (Relationships) | +--------------------+
+--------------------+ +--------------------+ | (Relationships) |
+--------------------+
如何将旧模型中的数据移动到新模型中?不清楚您希望如何合并标题。请详细解释。一本书和一个约会都有一个标题。文档与“书籍”或“约会”相关。我想将文档标题设置为其对应的书籍或约会。用可视化格式更新了问题