从必需变量到可为空的领域迁移 [英] Realm migration from a required variable to nullable

问题描述

从必需变量到可空变量的领域迁移

Realm migration from a required variable to nullable

我有一个变量，它是我以前版本的领域中的必需字段.但是对于较新的版本，我希望它不是必需的，而是可以为空的.我如何通过领域迁移来做到这一点?

I had a variable which was a REQUIRED field in my previous version of realm. But for the newer version i want it to be not required but a nullable one. How do i do it through realm migration?

推荐答案

您可以查看 migrationExample 由 Realm 团队提供

You can check the example in migrationExample provided by Realm team

if (oldVersion == 2) {
   RealmObjectSchema personSchema = schema.get("ClassName");
   personSchema.setNullable("nullableFielName", true);
}

如果您已经与 Realm Object Server 同步，请检查:https://realm.io/docs/java/latest/#syncing-migrations

If you have already synced with Realm Object Server, please check this: https://realm.io/docs/java/latest/#syncing-migrations

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