Javascript 如何从另一个模型中获取和查找另一个模型值？

我希望找到用户模型值，并希望将该值存储在我当前的博客模型中

exports.getAllBlogs = async (req, res) => {
  try {
    const blogs = await Blog.find()
      .sort({ created_at: -1 })
      .populate({
        path: "comments"
      })
      .exec();
    const myblogs = blogs.map(async blog => {
      const user = await User.findOne({ _id: blog.author });
      return (blog.authorName = user.name);
    });
    console.log(myblogs);

    if (blogs.length === 0) {
      return res.status(404).json({ message: "No Blogs Found" });
    }

    return res.status(200).json(myblogs);
  } catch (error) {
    console.log(error);

    res.status(500).json({ error: "Something went wrong" });
  }
};

但这是在回报我[承诺{}] 每件收藏品

---

如何实现这一点？有更好的方法吗？

因为在映射中使用异步。这将返回一系列承诺

试试这个

const myblogs=wait Promise.all(
blogs.map（异步blog=>{
const user=await user.findOne（{u id:blog.author}）；
blog.authorName=user.name；
返回博客；
})
);您可以使用“填充”获取所有相关信息，而无需地图

exports.getAllBlogs=async（req，res）=>{
试一试{
const blogs=wait Blog.find（{}）
.sort（{created_at:-1}）
.populate（“作者”，“密码”）
.填充({
路径：“评论”，
填充：{
路径：“用户”，
选择：“-密码”
}
});
返回res.status（200）.json（blogs）；
}捕获（错误）{
console.log（错误）；
json（{error:“出错了”}）；
}
};

这将给出如下示例结果：

[
    {
        "_id": "5e53b2896f41c765fc4defa1",
        "title": "Blog2 Title",
        "body": "Blog2 Body",
        "author": {
            "_id": "5e53b1726f41c765fc4def9c",
            "email": "user1@gmail.com",
            "name": "User1",
            "created_at": "2020-02-24T11:20:18.343Z",
            "updated_at": "2020-02-24T11:20:18.343Z",
            "id": "5e53b1726f41c765fc4def9c"
        },
        "created_at": "2020-02-24T11:24:57.078Z",
        "updated_at": "2020-02-24T11:24:57.078Z",
        "__v": 0,
        "comments": [
            {
                "_id": "5e53b34c6f41c765fc4defa5",
                "body": "Comment3 (user2 on user1's blog2)",
                "user": {
                    "_id": "5e53b1906f41c765fc4def9d",
                    "email": "user2@gmail.com",
                    "name": "User2",
                    "created_at": "2020-02-24T11:20:48.070Z",
                    "updated_at": "2020-02-24T11:20:48.070Z",
                    "__v": 0,
                    "id": "5e53b1906f41c765fc4def9d"
                },
                "blog": "5e53b2896f41c765fc4defa1",
                "created_at": "2020-02-24T11:28:12.551Z",
                "updated_at": "2020-02-24T11:28:12.551Z"
            }
        ],
        "id": "5e53b2896f41c765fc4defa1"
    },
    {
        "_id": "5e53b26c6f41c765fc4def9f",
        "title": "Blog1 Title",
        "body": "Blog1 Body",
        "author": {
            "_id": "5e53b1726f41c765fc4def9c",
            "email": "user1@gmail.com",
            "name": "User1",
            "created_at": "2020-02-24T11:20:18.343Z",
            "updated_at": "2020-02-24T11:20:18.343Z",
            "id": "5e53b1726f41c765fc4def9c"
        },
        "created_at": "2020-02-24T11:24:28.895Z",
        "updated_at": "2020-02-24T11:24:28.895Z",
        "__v": 0,
        "comments": [
            {
                "_id": "5e53b2f86f41c765fc4defa3",
                "body": "Comment1 (user2 on user1's blog1)",
                "user": {
                    "_id": "5e53b1906f41c765fc4def9d",
                    "email": "user2@gmail.com",
                    "name": "User2",
                    "created_at": "2020-02-24T11:20:48.070Z",
                    "updated_at": "2020-02-24T11:20:48.070Z",
                    "id": "5e53b1906f41c765fc4def9d"
                },
                "blog": "5e53b26c6f41c765fc4def9f",
                "created_at": "2020-02-24T11:26:48.506Z",
                "updated_at": "2020-02-24T11:26:48.506Z"
            },
            {
                "_id": "5e53b3246f41c765fc4defa4",
                "body": "Comment2 (user3 on user1's blog1)",
                "user": {
                    "_id": "5e53b1996f41c765fc4def9e",
                    "email": "user3@gmail.com",
                    "name": "User3",
                    "created_at": "2020-02-24T11:20:57.488Z",
                    "updated_at": "2020-02-24T11:20:57.488Z",
                    "id": "5e53b1996f41c765fc4def9e"
                },
                "blog": "5e53b26c6f41c765fc4def9f",
                "created_at": "2020-02-24T11:27:32.305Z",
                "updated_at": "2020-02-24T11:27:32.305Z"
            }
        ],
        "id": "5e53b26c6f41c765fc4def9f"
    }
]

这是可行的，但现在我只获取名称，然后我更改了一些代码`const myblogs=await Promise.all（blogs.map（async blog=>{const user=await user.findOne（{u id:blog.author}）；blog.author=user.name；return blog；}）`但是它并没有返回值，而是返回相同的值。有没有更好的方法来实现这一点，比如查询或者其他可以获取每个博客作者姓名和id的方法？
blog.authorName=user.name
不是相同的
blog.author=user.name；返回博客。可能是错了吧？您需要
blog.**authorName**=user.name；返回博客