What is the best way to ensure the user document is saved when a new post is being created

Having resolved previous issues, my focus now is on populating the user document with posts. Here is the current structure of the user document:


        {
            "posts": [],
            "_id": "5e75cf827ef14514f69c6714",
            "username": "dio",
            "email": "<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="aecac7c19f9c9deec9c3cfc7c280cdc1c3">[email protected]</a>",
            "password": "$2b$10$fwV.KaZG.5tjtmMxQ9NNE.7.XAh6pzLFgf85z9BpPVOgFguR2inGO",
            "createdAt": "2020-03-21T08:25:38.459Z",
            "updatedAt": "2020-03-21T08:25:38.459Z",
            "__v": 0
        }

To achieve this, I made some modifications while creating a new post for future population purposes.

newPost: (req, res) => {

    const data = {
        title: req.body.title,
        content: req.body.content,
        user: req.user.userId
    }

    Post.create(data, (err, newPost) => {
        console.log(data, "data")
        if (err) {
            return res.status(500).json({ error: err })
        } else if (!newPost) {
            return res.status(400).json({ message: "No Post found" })
        } else if (newPost) {
            User.findById(req.user.userId, (err, user) => {
                user.Posts = user.Posts.concat(newPost._id)
                return res.status(200).json({ newPost, user })
            })
        }
    })
}

However, when retrieving user information after these changes, it shows:

{ 
    posts: [ 5e75d89fa048e321f704453b ],
    _id: 5e75cf827ef14514f69c6714,
    username: 'dio',
    email: '<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="fd999492cccfcebd9a909c9491d39e9290">[email protected]</a>',
    password: '$2b$10$fwV.KaZG.5tjtmMxQ9NNE.7.XAh6pzLFgf85z9BpPVOgFguR2inGO',
    createdAt: 2020-03-21T08:25:38.459Z,
    updatedAt: 2020-03-21T08:25:38.459Z,
    __v: 0
 }

The issue arises when creating multiple posts as only the latest post ID gets added to the array instead of retaining all created post IDs. How can I ensure that all post IDs are remembered?

In addition, I am looking to retrieve the user's posts:

        getUserPosts: async (req, res) => {
            try {
              const user = await User.findById(req.params.id).populate("posts");

              if (!user) {
                return res.status(400).json({ error: "No user" });  
              }

              return res.status(200).json({ userPosts: user.posts });
            } catch (err) {
              return res.status(500).json({ error: "Server error" });
            }
        }

As the user document in the database has an empty posts array, I am unable to populate it. Any assistance would be appreciated.

Answer №1

Once the new post's id has been added to the user's posts array, it is essential to save the user:

  Post.create(data, (err, freshPost) => {
    console.log(data, "data");
    if (err) {
      return res.status(500).json({ error: err });
    } else if (!freshPost) {
      return res.status(400).json({ message: "No Post found" });
    } else if (freshPost) {
      User.findById(req.user.userId, (err, user) => {
        user.posts.push(freshPost._id);
        user
          .save()
          .then(() => {
            return res.status(200).json({ freshPost, user });
          })
          .catch(err => {
            return res.status(500).json({ error: err });
            console.log(err);
          });
      });
    }
  });

Based on what I recall from your previous inquiries, the field name for posts should be posts instead of Posts in the user schema. Thus, this particular line is crucial, and we utilize the push method as opposed to concat:

user.posts.push(freshPost._id);

Following that, all we have to do is save the user using the save method. Since the save method returns a promise, I included then catch blocks.

Answer №2

The answer provided by SuleymanSah is accurate. However, it is important to consider using the safer version:

User.update(
    { _id: req.user.userId }, 
    { $push: { userPosts: newPost._id } },
    done
);

Using $push ensures that the operation is atomic and prevents any modifications to the user between finding and saving.

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