IOS 中的领域:插入对象后无法更改主键 [英] Realm in IOS: Primary key can't be changed after an object is inserted

问题描述

我是使用 Realm 的新手.我有一些代码:

I'm some new in using Realm. I've some code:

RLMRealm *realm = [RLMRealm defaultRealm];
            [realm transactionWithBlock:^{
                self.object.objectPrimaryKey = someValue;
            }];

此字符串出现异常:self.object.objectPrimaryKey = someValue; 原因:'插入对象后主键不能更改.'

An exception occures on this string: self.object.objectPrimaryKey = someValue; with reason: 'Primary key can't be changed after an object is inserted.'

objectPrimaryKey is a primary key. What can I do to fix it?

推荐答案

docs 关于主键，主键只能设置一次.

docs about primary key, you can set primary key only once.

密钥一旦设置就不能更改:覆盖 Object.primaryKey() 以设置模型的主键.声明主键允许有效地查找和更新对象，并强制每个值的唯一性.一旦有主键的对象被添加到 Realm 中，主键就不能更改.

You can't change key once it's set: Override Object.primaryKey() to set the model’s primary key. Declaring a primary key allows objects to be looked up and updated efficiently and enforces uniqueness for each value. Once an object with a primary key is added to a Realm, the primary key cannot be changed.

这篇关于IOS 中的领域:插入对象后无法更改主键的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！