Question

我想在帖子中检索评论以进行编辑。我不确定如何处理这个问题。希望我在这里提出正确的问题。

下面＆＃39;我的发布文档是什么样的。

{
    "title" : "First Node.js App",
    "body" : "testing 123",
    "status" : "public",
    "user" : "John Doe",
    "date" : ISODate("2017-12-21T18:30:09.779Z"),
    "comments" : [ 
        {
            "commentBody" : "This is awesome! ",
            "commentUser" : ObjectId("5a3bfd5a9e65351f9c18ba18"),
            "_id" : ObjectId("5a3c02379e65351f9c18ba1a"),
            "commentDate" : ISODate("2017-12-21T18:49:27.620Z")
        },
        {
            "commentBody" : "This is second comment.",
            "commentUser" : ObjectId("5a3bfd5a9e65351f9c18gt19"),
            "_id" : ObjectId("5a3c02379e65351f9c18ba1b"),
            "commentDate" : ISODate("2017-12-21T18:49:27.620Z")
        }
    ],
    "allowComments" : true
}

如何检索评论ID ObjectId（＆＃34; 5a3c02379e65351f9c18ba1a＆＃34;）？

我尝试过以下但没有运气。

const post = await Post.findById(req.params.id);
const comment =  post.comments.find({"_id": req.params.commentid});

感谢您的帮助！

Answer 1

您需要将回调传递给Array#find：

const comment = post.comments.find((el) => el._id === req.params.commentid);

在mongoDB文档中通过ID获取嵌套对象

1 个答案: