什么是一个双向定向1时务请插入一个新的对象变成绿色的DAO DB的正确方法：？m关系

what is the correct way to insert a new object into a Green-DAO DB when dealing with a Bi Directional 1:m relation?

可以说，我有一个谈话实体和消息实体的聊天应用程序。每次谈话都有消息的列表，每一个消息有一个父对话。

Lets say, I have a chat application that has a conversation entity and a message Entity. every conversation has a list of messages, and every message has a parent conversation.

我做什么截至目前是：

Conversation conv = new Conversation();
ConversationDao.insert(conv);
List<Message> list = conv.getMessageList();

Message msg = new Message();
MessageDao.insert(msg);

msg.setParent(conv.getId());
list.add(msg);
// SHOULD I UPDATE THE CONVERSATION IN THE DB???

在我看来，像我这样做并不是正确的，我很想得到一些指导广告正确的方式做到这一点。

it seems to me like I'm not doing this correctly and I would love to get some guidance ad to the correct way to do this.

在此先感谢...

编辑：的 这可以从我的评论中可以看出，试图实现code我写到这里的方式后，我收到了空而不是谈话，我试图链接我改变了我的codeA位，现在它看起来是这样的：

as can be seen from my comment, after trying to implement code the way I wrote here, I get a null instead of the conversation I was trying to link.I changed my code a bit and now it looks like this:

private static void linkMessageToAuthorAndParent(Message messageObj, Thread parent) {
    List<Message> threadsMessages = parent.getMessageList();
    messageObj.setThread(parent);

    messageDao.insert(messageObj);

    threadsMessages.add(messageObj);
    Log.d("DtabaseHelper.parseMessage", "message was inserted");
}

但同样，我的问题是，我不知道该连接现在是双向的。我现在应该更新threadsDao？

but again, my problem is that I'm not sure the connection is now bi-directional. should I now update the threadsDao?

推荐答案

尝试这种方式：

Conversation conv = new Conversation();
ConversationDao.insert(conv);
List<Message> list = conv.getMessageList();

Message msg = new Message();
msg.setParent(conv.getId()); // Set FK *before* inserting
MessageDao.insert(msg);

list.add(msg);

在href=\"http://greendao-orm.com/documentation/relations/\" rel=\"nofollow\">官方文档上的关系的是有部分解决和更新到许多