Ios 领域迁移失败：“；“需要迁移”；

我正在向模型添加新属性，但一些领域错误使我感到困惑。 我尝试的第一件事是将regDate属性（NSString）更改为NSDate类型

RLMRealmConfiguration *config = [RLMRealmConfiguration defaultConfiguration];
config.schemaVersion = 2;

config.migrationBlock = ^(RLMMigration *migration, uint64_t oldSchemaVersion) {
    NSLog(@"========== Migration executed ==========");
    if (oldSchemaVersion < 2) {
        [migration enumerateObjects:Track.className block:^(RLMObject *oldObject, RLMObject *newObject) {
            NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
            [dateFormatter setDateFormat:@"yyyy-MM-dd HH:mm:ss"];
            newObject[@"regDate"] = [dateFormatter dateFromString:oldObject[@"regDate"]];
        }];
    }
};
[RLMRealmConfiguration setDefaultConfiguration:config];
[RLMRealm defaultRealm];

原因是需要迁移。但是，从未执行过迁移块

我认为除了从旧对象创建新属性并接受这个无用的regDate属性之外，别无选择

所以我改变了migrationBlock：

config.migrationBlock = ^(RLMMigration *migration, uint64_t oldSchemaVersion) {
    if (oldSchemaVersion < 2) {
        // Note: Even if you don't have to convert placeholder values,
        // you still have to provide at least an empty migration block
        // when your schema has changes to nullability of properties.
        [migration enumerateObjects:Track.className block:^(RLMObject *oldObject, RLMObject *newObject) {
            NSLog(@"========== Migration executed ==========");
            NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
            [dateFormatter setDateFormat:@"yyyy-MM-dd HH:mm:ss"];
            newObject[@"n_regDate"] = [dateFormatter dateFromString:oldObject[@"n_regDate"]];
        }];
    }
};

这次迁移块也不起作用

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我好像错过了什么。文档和错误对理解正在发生的事情没有帮助。

我通过将领域3.1.1更新为3.5.0解决了这个问题

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我不知道这是否是一个错误。但是，如果有人正在使用3.1.1版，我建议进行更新。

这段代码是否在AppDelegate的

ApplicationIDFinishLaunching

函数中调用？您何时收到迁移错误，是否在第

[RLMRealm defaultRealm]行？@DávidPászor首先，是的。第二，是的。你知道吗？那么我想到的另一个可能的原因是你没有更新
schemaVersion
。你确定它不应该是3而不是2吗？我再次检查，我确定
schemaVersion
是2，
oldSchemaVersion
是1。所以迁移块被执行了？或者你怎么知道
oldSchemaVersion
是1？
config.migrationBlock = ^(RLMMigration *migration, uint64_t oldSchemaVersion) {
    if (oldSchemaVersion < 2) {
        // Note: Even if you don't have to convert placeholder values,
        // you still have to provide at least an empty migration block
        // when your schema has changes to nullability of properties.
        [migration enumerateObjects:Track.className block:^(RLMObject *oldObject, RLMObject *newObject) {
            NSLog(@"========== Migration executed ==========");
            NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
            [dateFormatter setDateFormat:@"yyyy-MM-dd HH:mm:ss"];
            newObject[@"n_regDate"] = [dateFormatter dateFromString:oldObject[@"n_regDate"]];
        }];
    }
};

*** Terminating app due to uncaught exception 'RLMException', reason: 'Migration is required due to the following errors:
- Property 'Track.n_regDate' has been added.