Persistent Store 在大量迁移中找不到迁移策略类

Posted 2023-03-04

【中文标题】Persistent Store 在大量迁移中找不到迁移策略类

【英文标题】：Persistent Store can't find migration policy class in heavy migration

【发布时间】：2015-12-29 08:21:10

【问题描述】：

我收到此错误：

2015-12-29 03:13:41.603 n-back project[21345:474175] CoreData: error: -addPersistentStoreWithType:SQLite configuration:(null) URL:file:///Users/Nathan/Library/Developer/CoreSimulator/Devices/EC2C60E2-9FC8-40D7-B16F-15960AA6B42A/data/Containers/Data/Application/8F8132B0-76E9-491E-BA1B-27A5D78CE7D0/Documents/data.sqlite options:
    NSMigratePersistentStoresAutomaticallyOption = 1;
 ... returned error Error Domain=NSCocoaErrorDomain Code=134110 "(null)" UserInfo=NSUnderlyingException=Couldn't create mapping policy for class named (BTRPolicy) with userInfo dictionary 
    NSUnderlyingException = "Couldn't create mapping policy for class named (BTRPolicy)";

2015-12-29 03:13:41.608 n-back project[21345:474175] Unresolved error Error Domain=YOUR_ERROR_DOMAIN Code=9999 "Failed to initialize the application's saved data" UserInfo=NSLocalizedDescription=Failed to initialize the application's saved data, NSUnderlyingError=0x7b14eef0 Error Domain=NSCocoaErrorDomain Code=134110 "(null)" UserInfo=NSUnderlyingException=Couldn't create mapping policy for class named (BTRPolicy), NSLocalizedFailureReason=There was an error creating or loading the application's saved data., [NSLocalizedDescription: Failed to initialize the application's saved data, NSUnderlyingError: Error Domain=NSCocoaErrorDomain Code=134110 "(null)" UserInfo=NSUnderlyingException=Couldn't create mapping policy for class named (BTRPolicy), NSLocalizedFailureReason: There was an error creating or loading the application's saved data.]

在我看来，它在查找 BTRPolicy 类时遇到了问题。它存在于名为 BTRPolicy 的文件 BTRPolicy 中。它在实用程序窗格的自定义策略选择中被正确地分类并引用为“BTRPolicy”。有什么想法吗？

【参考方案1】：

如果其他人有这个问题并且这与您的谷歌搜索匹配：我想通了，由于某种原因，自定义策略现在需要以模块名称作为前缀。

【讨论】：

是只适用于 Swift 还是也适用于 Objective-C？

仅适用于 Swift。