Grails中多对多和一对多冲突问题

Question

我有以下两个领域类， 用户和帖子 并且它们之间有两个关系， 用户与帖子具有反向引用的1对多关系。 用户与他关注的帖子之间具有多对多关系： 我的关系如下：

User {
hasMany = [posts : Post, followingPosts: Post]
belongsTo = [Post] //For the many-to-many, this is the owner i'd like to have.

}

Post {
  hasMany = [followers: User]
  belongsTo = [owner: User] //For the 1-to-Many, this is my back-reference
}

现在我在Grails中遇到了冲突，我尝试通过映射来解决它，但是没有成功，这是我得到的错误：

    Domain classes [Post] and [User] cannot own each other in a many-to-many relationship. Both   contain belongsTo definitions that reference each other. (Use --stacktrace to see the full trace)

有人知道如何解决这个问题吗？

- user1847198

Answer 1

我认为你可以使用mappedBy来完成，例如：

class User{

  static hasMany = [posts : Post, followingPosts: Post]
  static mappedBy = [posts : "user"]
}


class Post{  

  User user
  static hasMany = [followers: User]
  static belongsTo = User
}

请查看this以获取有关mappedBy的更多信息。

- Tiago Farias