迁移多个领域 - 领域版本大于模式版本异常 [英] Migrating multiple realms - Realm Version Greater Than Schema Version exception

问题描述

为什么会抛出此异常（当我尝试迁移多个域时）？

Why this exception is thrown (when I'm trying to migrate multiple realms)?

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;
}

推荐答案

首先我需要以正确的方式实例化realmconfig。

First of all I needed to instantiate realmconfig in the right way.

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

而不是：

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

我需要删除额外的schemaVersion配置和冗余迁移块：

And I needed to remove the additional schemaVersion config and redundant migrationblocks:

config.schemaVersion = migrationVersion;

在执行实际迁移之前：

[RLMRealm migrateRealm:someOtherConfig];

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