设置一对多关系核心数据和神奇记录 [英] Setting one-to-many relationship Core Data and Magical Record

问题描述

如果我有一个对话与消息具有一对多关系的实体（即一个对话可以有很多消息），我创建一个新的消息实体，如下：

If I have a Conversation entity with a one-to-many relationship to Messages (i.e. one conversation can have many messages) and I create a new message entity like so:

_message = [Message MR_createInContext:_managedObjectContext];
_message set properties ...

// Use this method to set relationship?
[_conversation addToMessageObject:(Message *)] 

如果我已经有一个_conversation对象，

If I already have a _conversation object, how do I add this new message to the conversation (in other words, how do I establish the relationship)?

推荐答案

我将这个新消息添加到会话中（换句话说，如何建立关系） ve还有一个问题，你需要在 _message 上创建关系：

I've had a problem with this too, you need to create the relationship on the _message instead:

_message.conversation = _conversation;

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