MongoDB - How to Update or Insert object in array - reactjs

Question

I have the following collection
{
"likes": [],
"_id": "6086f47a3e8c0411f0a66d22",
"creator": "dimer",
"picture": "",
"title": "",
"body": "hello world",
"comments": [
{
"isReady": true,
"likes": [],
"_id": "6086fcf33e8c0411f0a66d25",
"creatorId": "607e50a16e852544d41a1d9d",
"creator": "dimer",
"body": "hello world",
"replies": [],
"timestamp": 1619459315854
},
],
"createdAt": "2021-04-26T17:12:26.632Z",
"updatedAt": "2021-04-27T04:22:28.159Z",
"__v": 0
},
I want to push into comment.replies a new reply if the comment and the post exists.
How to Update or Insert object into a nested array with conditions?
I tried this:
module.exports.createReply = async (req, res) => {
const user_ID = req.body.creatorId;
const post_ID = req.params.id;
const comment_ID = req.body.commentId;
if (!ID.isValid(user_ID) && !ID.isValid(post_ID) && !ID.isValid(comment_ID)) {
return res.status(400).send("ID unknown");
}
try {
console.log("hello woorld");
const reply = {
creatorId: user_ID,
creator: req.body.creator,
body: req.body.body,
timestamp: new Date().getTime(),
};
console.log("reply", reply);
await PostModel.findById(post_ID, (err, docs) => {
console.log(comment_ID);
const comment = docs.comments.find((comment) =>
comment._id.equals(comment_ID)
);
console.log("comment", comment);
if (!comment) return res.status(404).send("comment not found" + err);
comment.replies = [...comment.replies, reply];
return docs.save((err, docs) => {
if (!err) return res.status(200).send(docs);
return res.status(400).send(err);
});
});
} catch (error) {
return res.status(400).send(err);
}
};
I think I'm not reaching the replies because I'm getting this error:
{
"errors": {
"comments.4.creator": {
"name": "ValidatorError",
"message": "Path `creator` is required.",
"properties": {
"message": "Path `creator` is required.",
"type": "required",
"path": "creator"
},
"kind": "required",
"path": "creator"
}
},
"_message": "post validation failed",
"name": "ValidationError",
"message": "post validation failed: comments.4.creator: Path `creator` is required."
}
This is my model:
const nongoose = require("mongoose");
const PostSchema = nongoose.Schema(
{
creatorId: {
type: String,
// trim: true,
// required: true,
},
creator: {
type: String,
trim: true,
required: true,
},
title: {
type: String,
maxlength: 80,
},
body: {
type: String,
trim: true,
maxlength: 250,
required: true,
},
picture: {
type: String,
},
video: {
type: String,
},
likes: {
type: [String],
require: true,
},
comments: {
required: true,
type: [
{
isReady: {
type: Boolean,
default: true,
},
creatorId: {
type: String,
required: true,
},
creator: {
type: String,
required: true,
},
timestamp: Number,
body: {
type: String,
required: true,
trim: true,
},
likes: {
type: [String],
required: true,
},
replies: {
require: true,
type: [
{
isReady: {
type: Boolean,
default: true,
},
creatorId: {
type: String,
required: true,
},
creator: {
type: String,
required: true,
},
body: {
type: String,
required: true,
trim: true,
},
timestamp: Number,
},
],
},
},
],
},
},
{
timestamps: true,
}
);
module.exports = nongoose.model("post", PostSchema);

Answer 1

Like the error says, Path creator is required.
Make sure the reply has the 'creator' field.

Answer 2

To get the updated document in the update’s return value, you need to use findOneAndUpdate 1 or findAndModify methods. Both the methods have a parameter where you can specify to return the updated document. Note that the Mongoose ODM has corresponding methods, but may have slightly different syntax.
My solution:
module.exports.createReply = async (req, res) => {
const user_ID = req.body.creatorId;
const post_ID = req.params.id;
const comment_ID = req.body.commentId;
if (!ID.isValid(user_ID) && !ID.isValid(post_ID) && !ID.isValid(comment_ID)) {
return res.status(400).send("ID unknown");
}
try {
const reply = {
creatorId: user_ID,
creator: req.body.creator,
body: req.body.body,
timestamp: new Date().getTime(),
};
const query = { _id: post_ID };
const update = { $push: { "comments.$[elem].replies": reply } };
const options = { new: true, arrayFilters: [{ "elem._id": comment_ID }] };
await PostModel.findOneAndUpdate(query, update, options);
let updated = await PostModel.findOne({ _id: post_ID });
return res.status(200).send({
data: updated.comments.find((comment) => comment._id.equals(comment_ID)),
});
} catch (err) {
return res.status(400).send({ err: err });
}
};