java - Grails 多对多和一对多冲突

Question

我有以下两个域类，用户和帖子我在他们之间有两种关系，用户与带有反向引用的帖子一对多。用户与他关注的帖子具有多对多关系:我得到的关系如下:

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
}

现在我遇到了与 Grails 的冲突，我尝试通过映射解决它但没有成功，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)

有人知道怎么解决吗？

Answer 1

我认为您可以使用 ma​​ppedBy 来做到这一点，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
}

看看this有关 ma​​ppedBy 的更多信息。