帖子、评论、回复和点赞数据库架构

Question

我有一个网站，用户可以在其中评论帖子或回复评论。用户还可以喜欢回复或评论。但是，在回复 table 中还有另一个名为 reply_to 的字段。这是我当前的架构：

Comment
id
user (foreign key)
post (foreign key)
comment

Reply
id
user (foreign key)
reply_to (who the user is replying to)
comment (foreign key)
reply

CommentLike (Table that shows which user liked which comments)
id
comment (foreign key)
user (foreign key)
like (1 = likes, 0 = dislikes)

ReplyLike (Table that shows which user liked which replies)
id
reply (foreign key)
user (foreign key)
like (1 = likes, 0 = dislikes)

这看起来是一个很好的模式，还是有更好的方法来创建这种结构？

Answer 1

我建议结构如下，只有 2 个表：

Comment:
id
user (foreign key)
post (foreign key)
comment_text
parent_comment_id (null or -1 if a new comment and comment_id of the parent if a reply)


CommentLike (Table that shows which user liked which comments):
id
comment (foreign key)
user (foreign key)
like (1 = likes, 0 = dislikes)

• 这样做的原因是因为 reply 本身就是一个 comment，只是对某些 parent 评论的 child。因此，我不会将其作为一个单独的实体。
• 请注意，您需要注意删除操作并删除所有当前评论被删除的评论，因为它是parent_id。为此，您可以寻求 ON DELETE CASCADE 的帮助。