ios - 迁移多个 Realm - Realm 版本大于架构版本异常

Question

为什么抛出这个异常(当我尝试迁移多个 Realm 时)？

bool ObjectStore::is_schema_at_version(Group *group, uint64_t version) {
    uint64_t old_version = get_schema_version(group);
    if (old_version > version && old_version != NotVersioned) {
        throw ObjectStoreException(ObjectStoreException::Kind::RealmVersionGreaterThanSchemaVersion,
                                   {{"old_version", to_string(old_version)}, {"new_version", to_string(version)}});
    }
    return old_version != version;
}

Answer 1

首先，我需要以正确的方式实例化 realmconfig。

RLMRealmConfiguration *someOtherConfig = [[RLMRealmConfiguration defaultConfiguration] copy];

代替:

RLMRealmConfiguration *someOtherConfig = [[RLMRealmConfiguration alloc] init];

我需要删除额外的 schemaVersion 配置和冗余的迁移 block :

config.schemaVersion = migrationVersion;

在执行实际迁移之前:

[RLMRealm migrateRealm:someOtherConfig];