如何设计可以参考问题表或答案表的评论表？
为了说明目的，让我们考虑3个表：问题，答案和用以下ORM模型（在C＃中）进行注释。
- 一个问题可以具有零或更多答案和/或评论。
- 答案属于问题，并且可以具有零或更多评论。
- 评论属于问题或答案。
规则模仿SO/SE机制。
class Question
{
public int Id {get; set;}
public string Content {get; set;}
public IEnumerable<Answer> Answers {get; set;}
public IEnumerable<Comment> Comments {get; set;}
}
class Answer
{
public int Id {get; set;}
public string Content {get; set;}
public Question Question {get; set;}
public IEnumerable<Comment> Comments {get; set;}
}
class Comment
{
public int Id {get; set;}
public string Content {get; set;}
public ?????? For {get; set;}
}
问题
我不知道如何构造注释表，其中属性可以是问题 或答案 。 属性的类型是什么？
For illustration purposes, let's consider 3 tables: Question, Answer and Comment with the following ORM models (in C#).
- A question can have zero or more answers and/or comments.
- An answer belongs to a question and can have zero or more comments.
- A comment belongs to either a question or an answer.
The rules mimic SO/SE mechanism.
class Question
{
public int Id {get; set;}
public string Content {get; set;}
public IEnumerable<Answer> Answers {get; set;}
public IEnumerable<Comment> Comments {get; set;}
}
class Answer
{
public int Id {get; set;}
public string Content {get; set;}
public Question Question {get; set;}
public IEnumerable<Comment> Comments {get; set;}
}
class Comment
{
public int Id {get; set;}
public string Content {get; set;}
public ?????? For {get; set;}
}
Question
I have no idea how to construct the Comment table in which the property For can be either Question or Answer. What is the type of For property?
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评论（1）
没有什么！将其留在
ef上，它将管理这些关系。请注意，我可以说关系是一对多的答案和问题有自己的注释钥匙，您必须使用两个键nothing! leave it to
EF, it will manage these relations. as a note, I can say the relations are one-to-many eachAnswerandQuestionhas ownCommentso if you want to put foreign keys you must use two keys for both of them