Mongodb.find返回空数组[重复]

Question

我有这行代码

    const comments = await db.Comment.find({post: req.params.post_id});
    return res.status(200).json({comments});

请求已成功发送到后端，但 cmets 响应为空数组

/*
  res code: 200
*/

{
 comments: []
}

我检查了其他数据库功能，它们都可以正常工作，例如添加评论、编辑等

我的评论集是这样的

{"_id":{"$oid":"605d1faeb202e4425c004be9"},"text":"Welcome to this comment","user":{"$oid":"5ff5d878dd830142686b7fd5"},"post":{"$oid":"6016f770ea76030d24688f89"},"createdAt":{"$date":{"$numberLong":"1616715694247"}},"updatedAt":{"$date":{"$numberLong":"1616715694247"}},"__v":{"$numberInt":"0"}}


--------------------------------------------------------
{"_id":{"$oid":"605d1fb8b202e4425c004bea"},"text":"Welcome to this comment2","user":{"$oid":"5ff5d878dd830142686b7fd5"},"post":{"$oid":"6016f770ea76030d24688f89"},"createdAt":{"$date":{"$numberLong":"1616715704381"}},"updatedAt":{"$date":{"$numberLong":"1616715704381"}},"__v":{"$numberInt":"0"}}

我正在尝试按在我的评论收藏中保存为帖子的帖子 ID 进行搜索

Answer 1

我认为您需要将 req.params.post_id 包装在 ObjectId 中。

像这样

const ObjectId = require('mongoose').Types.ObjectId;

const comments = await db.Comment.find({
   post: new ObjectId(req.params.post_id)
});