ios - 当我只允许保存当前登录的用户时，如何为用户创建反向关系？

Question

我的 User 类与 Convos 类具有多对多的关系。我想将user（PFUser *不是当前登录的用户）添加到convo对象，并且我想添加convo到user对象以实现逆关系。

PFRelation *relation = [self.convo relationforKey:@"users"];
[relation addObject:user];

[self.convo save];

PFRelation *inverseRelation = [user relationforKey:@"convos"];
[inverseRelation addObject:self.convo];
[user save];

问题是我不允许保存user，因为显然我只能保存当前登录的用户。这是错误：

除非已通过登录或注册进行身份验证，否则无法保存用户

我该如何解决这个问题？

Answer 1

我能想到的最简单的方法是拥有一个单独的 PFObject ，它拥有 Convos 关系。例如

PFUser["proxy"] -> PFObject["convos"] -> PFRelation

您的代码将变为：

PFObject *relation = [self.convo relationforKey:@"users"];
[relation addObject:user];

PFObject *userProxy = [user objectForKey:@"proxy"];

// N.B. You need to make sure this object exists already, and create it if not
// N.B. Make sure you include this key when you query for the user, or you'll need to load the data here
if (userProxy == nil) NSAssert(nil, @"Need to create the users Proxy object");
if (userProxy.isDataAvailable == NO) NSAssert(nil, @"Need to include the Proxy object key in the user query");


PFRelation *inverseRelation = [userProxy relationforKey:@"convos"];
[inverseRelation addObject:self.convo];

[PFObject saveObjects:@[self.convo, userProxy]];