ios - deleteObject 在 Realm 中不起作用

Question

这是我的代码，我不知道我做错了什么。我正在按照文档中的说明进行操作 http://realm.io/docs/cocoa/0.91.1/#deleting-objects

       // Delete Current Object
        RLMRealm *realm = RLMRealm.defaultRealm;

        [realm beginWriteTransaction];
        EBooks *eBookdb = [[EBooks alloc]init];
        eBookdb.eBook_ID = [NSString stringWithFormat:@"%@",self.eBookID];
        eBookdb.status = @"canceled";
        [EBooks createOrUpdateInRealm:realm withObject:eBookdb];

        [realm commitWriteTransaction];

        //=> break point here before crash      

        [realm beginWriteTransaction];
        [realm deleteObject:eBookdb];
        [realm commitWriteTransaction];

应用程序在断点后崩溃并出现以下错误

'Can only delete an object from the Realm it belongs to.'

Answer 1

问题是您正在尝试删除独立的 EBooks 对象，而不是 Realm 中持久存在的对象。如果您将代码更改为以下内容，它应该可以工作:

// Delete Current Object


RLMRealm *realm = RLMRealm.defaultRealm;

[realm beginWriteTransaction];
EBooks *eBookdb = [[EBooks alloc]init];
eBookdb.eBook_ID = [NSString stringWithFormat:@"%@",self.eBookID];
eBookdb.status = @"canceled";
eBookdb = [EBooks createOrUpdateInRealm:realm withObject:eBookdb];

[realm commitWriteTransaction];  

[realm beginWriteTransaction];
[realm deleteObject:eBookdb];
[realm commitWriteTransaction];