ios - 在 Core Data 中添加新的独立实体是否需要模型版本控制？

我想在我的项目中添加一个新的核心数据实体。我是否需要为此添加新的核心数据模型版本，否则它将在现有版本中工作？该实体是独立的，它将与其他先前定义的实体没有任何关系。

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Best Answer-推荐答案

确实，它需要添加一个新的模型版本。但是，添加新实体可以由 lightweight migration 处理。 ，因此至少您不必创建映射模型/编写自定义迁移代码。

更新:

来自关于轻量级迁移的文章:

In addition, Core Data supports: ... Changing the entity hierarchy

• You can add, remove, rename entities
• You can create a new parent or child entity and move properties up and down the entity hierarchy
• You can move entities out of a hierarchy
• You cannot, however, merge entity hierarchies; if two existing entities do not share a common parent in the source, they cannot share a common parent in the destination

如果你不使用版本控制，你会得到这样的错误:

Error Domain=NSCocoaErrorDomain Code=134100 "(null)" UserInfo={metadata={ NSPersistenceFrameworkVersion = 641; NSStoreModelVersionHashes = { TestEntity1 = ; }; NSStoreModelVersionHashesVersion = 3; NSStoreModelVersionIdentifiers = ( "" ); NSStoreType = SQLite; NSStoreUUID = "F16AD345-02FE-4E94-B11E-3BC337B16568"; "_NSAutoVacuumLevel" = 2; }, reason=The model used to open the store is incompatible with the one used to create the store} with userInfo dictionary { metadata = { NSPersistenceFrameworkVersion = 641; NSStoreModelVersionHashes = { TestEntity1 = ; }; NSStoreModelVersionHashesVersion = 3; NSStoreModelVersionIdentifiers = ( "" ); NSStoreType = SQLite; NSStoreUUID = "F16AD345-02FE-4E94-B11E-3BC337B16568"; "_NSAutoVacuumLevel" = 2; }; reason = "The model used to open the store is incompatible with the one used to create the store"; }

这对我来说似乎是使用版本控制的好理由)

关于ios - 在 Core Data 中添加新的独立实体是否需要模型版本控制？，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/36261757/