Ios NSStoreModelVersionHash解决核心数据迁移中的错误

目前，我对核心数据的轻量级迁移存在问题。在深入研究之后，我发现模型中的一个实体上的NSStoreModelVersionHash存在问题。这实际上发生在我向核心数据模型添加模型版本之前，我通过重新创建模型来验证这一点

我使用以下两种方法以编程方式获得模型的版本哈希值：

NSDictionary *sourceMetadata = [NSPersistentStoreCoordinator metadataForPersistentStoreOfType:NSSQLiteStoreType URL:[NSURL fileURLWithPath:storePath] error:&error]; NSDictionary *hashesFromMetadata = [sourceMetadata objectForKey:@"NSStoreModelVersionHashes"]; NSDictionary*sourceMetadata=[NSPersistentStoreCoordinator metadataForPersistentStoreOfType:NSSQLiteStoreType URL:[NSURL fileURLWithPath:storePath]错误：&错误]； NSDictionary*hashesFromMetadata=[sourceMetadata objectForKey:@“NSStoreModelVersionHashes”]； 及

NSMutableArray*文件路径=[[NSMutableArray alloc]init]； NSString*directoryPath=[bundle-pathForResource:modelName of type:@“momd”]； NSDirectoryEnumerator*枚举器=[[NSFileManager defaultManager]枚举器路径：directoryPath]； NSString*文件路径； 而（（文件路径=[enumerator nextObject]）！=nil）{ 如果（[[filePath pathExtension]isEqualToString:@“mom”]）{ [filePath addObject:[directoryPath stringByAppendingPathComponent:filePath]]； } } /*Model.momd目录只包含一个“mom”文件：Model.mom“*/ NSURL*momURL=[NSURL fileURLWithPath:[filePaths objectAtIndex:0]]； NSManagedObjectModel*模型=[[NSManagedObjectModel alloc]initWithContentsOfURL:momURL]； NSDictionary*hashesFromModel=[model entityVersionHashesByName]； 令我惊讶的是，我发现我有两个不同的散列值。请注意，我还没有添加任何模型版本，也没有修改模型。请参阅下面EntityB的散列值

hashesFromMetadata: { EntityA = "8fc59055 bd81d862 198a4cf8 160ab711 84191bd4 2340eb4b 1ceeb19b 4643f7d6"; EntityB = "bf73667d 19a25289 cd013e23 fc4524ce fb1095f9 6ad13aec f978ae1a 321388ed"; EntityC = "4a55d875 fdb54969 c56d7add 201cb2c3 e244a5f1 b4950a74 55af1372 fa4f79b8"; EntityD = "60fe2d8c e0061e78 c43f10aa 58cf1b5e 4cbb52a3 351ac83f 144ade9d 8687b22b"; EntityE = "75c68768 31ef472b 567df030 36f99100 f52aa84e 7c8e2e81 1d070f07 cfd922be"; EntityF = "53823f0a 94745434 d9076b5c c8f8b153 b74a2f9c 06f15576 e5878527 d1309d4f"; } hashesFromModel: { EntityA = "8fc59055 bd81d862 198a4cf8 160ab711 84191bd4 2340eb4b 1ceeb19b 4643f7d6"; EntityB = "c671f2ef 52eb91b1 73e4e9f2 92b70eed 9b09da23 ef66c016 4d684047 9d7b1efe"; EntityC = "4a55d875 fdb54969 c56d7add 201cb2c3 e244a5f1 b4950a74 55af1372 fa4f79b8"; EntityD = "60fe2d8c e0061e78 c43f10aa 58cf1b5e 4cbb52a3 351ac83f 144ade9d 8687b22b"; EntityE = "75c68768 31ef472b 567df030 36f99100 f52aa84e 7c8e2e81 1d070f07 cfd922be"; EntityF = "53823f0a 94745434 d9076b5c c8f8b153 b74a2f9c 06f15576 e5878527 d1309d4f"; } hashesFromMetadata：{ EntityA=“8fc59055 bd81d862 198a4cf8 160ab711 84191bd4 2340eb4b 1ceeb19b 4643f7d6”； EntityB=“bf73667d 19a25289 cd013e23 fc4524ce fb1095f9 6ad13aec f978ae1a 321388ed”； EntityC=“4a55d875 fdb54969 C56D7添加201cb2c3 e244a5f1 b4950a74 55af1372 fa4f79b8”； EntityD=“60fe2d8c e0061e78 c43f10aa 58cf1b5e 4cbb52a3 351ac83f 144ade9d 8687b22b”； EntityE=“75c68768 31ef472b 567df030 36f99100 f52aa84e 7c8e2e81 1d070f07 cfd922be”； EntityF=“53823f0a 94745434 d9076b5c c8f8b153 b74a2f9c 06f15576 e5878527 d1309d4f”； } hashesFromModel：{ EntityA=“8fc59055 bd81d862 198a4cf8 160ab711 84191bd4 2340eb4b 1ceeb19b 4643f7d6”； EntityB=“c671f2ef 52eb91b1 73e4e9f2 92b70eed 9b09da23 ef66c016 4d684047 9D7B1FE”； EntityC=“4a55d875 fdb54969 C56D7添加201cb2c3 e244a5f1 b4950a74 55af1372 fa4f79b8”； EntityD=“60fe2d8c e0061e78 c43f10aa 58cf1b5e 4cbb52a3 351ac83f 144ade9d 8687b22b”； EntityE=“75c68768 31ef472b 567df030 36f99100 f52aa84e 7c8e2e81 1d070f07 cfd922be”； EntityF=“53823f0a 94745434 d9076b5c c8f8b153 b74a2f9c 06f15576 e5878527 d1309d4f”； } 我还检查了VersionInfo.plist文件的内容，发现散列值与hashesFromModel中的值相同

显然，这种差异总是会导致核心数据迁移失败，并出现错误：“找不到源存储的模型”

以前有人遇到过这个问题吗？知道如何在这种情况下执行轻量级迁移吗？非常感谢您的输入/反馈

非常感谢

hashesFromMetadata: { EntityA = "8fc59055 bd81d862 198a4cf8 160ab711 84191bd4 2340eb4b 1ceeb19b 4643f7d6"; EntityB = "bf73667d 19a25289 cd013e23 fc4524ce fb1095f9 6ad13aec f978ae1a 321388ed"; EntityC = "4a55d875 fdb54969 c56d7add 201cb2c3 e244a5f1 b4950a74 55af1372 fa4f79b8"; EntityD = "60fe2d8c e0061e78 c43f10aa 58cf1b5e 4cbb52a3 351ac83f 144ade9d 8687b22b"; EntityE = "75c68768 31ef472b 567df030 36f99100 f52aa84e 7c8e2e81 1d070f07 cfd922be"; EntityF = "53823f0a 94745434 d9076b5c c8f8b153 b74a2f9c 06f15576 e5878527 d1309d4f"; } hashesFromModel: { EntityA = "8fc59055 bd81d862 198a4cf8 160ab711 84191bd4 2340eb4b 1ceeb19b 4643f7d6"; EntityB = "c671f2ef 52eb91b1 73e4e9f2 92b70eed 9b09da23 ef66c016 4d684047 9d7b1efe"; EntityC = "4a55d875 fdb54969 c56d7add 201cb2c3 e244a5f1 b4950a74 55af1372 fa4f79b8"; EntityD = "60fe2d8c e0061e78 c43f10aa 58cf1b5e 4cbb52a3 351ac83f 144ade9d 8687b22b"; EntityE = "75c68768 31ef472b 567df030 36f99100 f52aa84e 7c8e2e81 1d070f07 cfd922be"; EntityF = "53823f0a 94745434 d9076b5c c8f8b153 b74a2f9c 06f15576 e5878527 d1309d4f"; }