Question

我目前在Post和Comment之间存在一对多的关系。一个Post可以包含多个Comments。我想要做的是为评论创建多对多关系。我在User和Comment之间也有一对多的关系。

即每个Comment应该能够包含Comment的集合。例如。一个用户可以评论另一个用户的评论。我想保留注释的顺序，以便可以正确的顺序显示它们。

public class Comment
    {
        [Key]
        public Guid Id { get; set; }

        [Required, MaxLength(1000)]
        public string Message { get; set; }

        [Required]
        public DateTime Created { get; set; }

        //need to set this up
        public ICollection<Comment> ChildComments { get; set; }

        [Required]
        public Guid PostId { get; set; }

        [Required]
        public Post CommentForPost { get; set; }

        [Required]
        public Guid UserId { get; set; }

        [Required]
        public User CreatedBy { get; set; }
    }

在保持与其他实体的一对多关系的同时，建立这种关系的正确方法是什么？我最终会创建联接表吗？我不太确定如何建立我的EF关系以实现上述情况。

Answer 1

每个评论应能够包含评论的集合

for i in range (2,351):  # changing 1 to 2 fixed the error for me.
    if (2 << i-2) % i == 1:  # this will check if it's true, then only print
        print i, [(2 << i - 2) % i == 1]

然后进行配置。您可以这样做：

public class Comment
{
 [Key]
        public Guid Id { get; set; }

        [Required, MaxLength(1000)]
        public string Message { get; set; }

        [Required]
        public DateTime Created { get; set; }

        //need to set this up
        public ICollection<Comment> ChildComments { get; set; }

        [Required]
        public Guid PostId { get; set; }

        [Required]
        public Post CommentForPost { get; set; }

        [Required]
        public Guid UserId { get; set; }

        [Required]
        public User CreatedBy { get; set; }

   //this comment can be a child comment for (if is set) 
   // ParentCommentId is optional
           public string ParentCommentId {get;set;}
           public Comment ParentComment {get;set;}    
   //this comment can have many comments
           public ICollection<Comment> ChildComments {get;set;}

}

EF Core-如何为已经存在一对多关系的同一实体设置多对多

1 个答案: