deleteObject在Realm中不起作用

Question

这是我的代码,我无法弄清楚我做错了什么.我正在按照文档中的说法 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];

并且应用程序在断点之后崩溃并出现以下错误

'只能从它所属的领域中删除一个对象.

Answer 1

问题是您正在尝试删除独立EBooks对象,而不是继承在Realm中的对象.如果您将代码更改为以下代码,它应该工作:

// 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];