聊天，对话，消息 - CoreData模型 [英] Chat, conversation, messaging - CoreData model

问题描述

在将问题标记为此问题的重复之前， a>请阅读说明。我不需要在评论中继续讨论。

所以我想为消息应用创建 CoreData 模型。像我在本主题中说的，我有三个实体：

1. 用户
>

2. 对话实体使用邮件定义对话用户。

好，所以我的数据模型是：


但是一切都在这里相互连接。上述答案与我的解决方案之间的唯一区别是 User 和 Message - 多种关系。我想我需要，因为没有，这是不可能知道谁在对话中写了什么。

但是，就我所知道的数据模型，当一切都互相连接没有意义。

因此，这里的主要目标是：

2. 在一个会话中可以加入至少两个用户


3. 该消息仅支持短信


4. 用户必须能够列出他的所有会话。

就是这样。

请验证当前解决方案，随时批评。

解决方案

，实际上不需要 User 和 Conversation 之间的多对多关系。
/ p>

如果用户喜欢获取其所有对话，他可以使用此提取请求：

  User * user = //获取一些用户你喜欢的对话
 NSFetchRequest * r = [NSFetchRequest fetchRequestWithEntityName：@Conversation]; 
 r.predicate = [NSPredicate predicateWithFormat：@ANY messages.author =％@，user]; 
  

以同样的方式，您可以获得给定会话的所有用户。

您可以将其建模为每个实体上的提取属性（ User 和 code>）。

您应该考虑将聊天关系更改为 messages

Before you mark a question as a duplicate of this question please read a description. I don't need to continue discussion there in the comment.

So I want to create CoreData model for messaging app. Like said in this topic did i mentioned - i've had three entities:

1. User entity define a author of message and participant in a conversation.
2. Message entity define every text sending with app.
3. Conversation entity defines conversation beetwen users using messages.

OK so my data model is like:

But everything is connected to each other here. The only difference between mentioned answer and my solution is that User and a Message are connected using one-to-many relationship. I think i need that, becouse without that it's impossible to know who wrote what in a conversation.

But as far as i know data model when everything is connected to each other have no sense.

So the key goals here is:

1. In conversation screen i want to know who wrote what
2. In one conversation can participate at least two users
3. The message is text-only
4. User have to be able to list all his conversations.

That's it.

Please validate the current solution and feel free to criticize.

解决方案

As far as I can tell, there is no real need for the many-to-many relationship between User and Conversation.

If a user like to get all of its conversations he could use this fetch request:

User* user = //get some user you like conversations for
NSFetchRequest* r = [NSFetchRequest fetchRequestWithEntityName:@"Conversation"];
r.predicate = [NSPredicate predicateWithFormat:@"ANY messages.author = %@",user];

In the same fashion you could get all users of a given conversation.

You could model this as a fetched property on each of these entities (User and Conversation).

You should really consider changing the chat relationship to messages

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