Update array in subdocument dynamically with Mongoose

Question

I need to update array field in subdocument and that works

User.findOne({ _id: id }, (err, user) => {
    if (!user) res.json({ error: "Email has not be found" });
    user.set({ "files.0.approved": isApproved });
    user.save((err, updatedUser) => {
      return res.send(updatedUser);
    });
 });

Nevertheless, I wonder how can I make it dynamic ? Since here I'm passing index manually - files.0.approved.

I tried using template strings, but it complains.

I also tried referring here, but could not figure it out.

If we assume that I can get index of array with req.body.index, how to prevent it from being hard-coded ?

How does it complaint while using template strings? Which error are you getting? — Volodymyr
– Volodymyr, Commented Oct 27, 2018 at 14:06

Seinfeld · Accepted Answer · 2018-10-27 14:13:58Z

1

I managed to do it this way.

 User.findOneAndUpdate(
    { _id: id, "files._id": file_id },
    { $set: { "files.$.approved": isApproved } },
    (err, updatedUser) => {
      if (err) res.json({ error: "Something went wrong" });
      res.json({ message: "success" });
    }
  );

Apparently, you initially find the file you need to update and then mongoose has $ operator that points to the index that has been found.

answered Oct 27, 2018 at 14:13

Seinfeld

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