How to link documents on mongoose - express

Question

I am new to express development and i am trying to build a blog. I have built two models, one for posts and one for uses. On users schema i have an attribute posts to save the post when a user creates a post. On the controller, before i create a post first i am taking the user's id from the req.params and after that i retrive the user by findbyid function and try to save the post on user's posts attribute, but with no succeful.
const mongoose = require("mongoose");
UserSchema = new mongoose.Schema({
name: {
type: String,
required: true
},
email: {
type: String,
required: true,
unique: true
},
password: {
type: String,
required: true
},
posts: [{type: mongoose.Schema.Types.ObjectId, ref: "Post"}]
})
module.exports = mongoose.model("User", UserSchema);
const Post = require("../model/post");
const User = require("../model/user");
module.exports = {
new: (req, res) => {
res.render("new_post");
},
post_new: (req, res) => {
const title = req.body.title;
const article = req.body.article;
const id = req.params.id;
const post = new Post({
title: title,
article: article,
})
User.findById(id)
.then(user => {
user.posts.push(post);
})
//post.created_by.push(id);
post.save()
.then(result => {
console.log("Post has created");
res.redirect("/");
});
}
};

Answer 1

I see a few problems.
You user schema should not have array of posts. Instead, your post schema should have a field named user/userId to store user ID.
Example:
const PostSchema = new mongoose.Schema({
title: { type: String },
....,
userId: {type: mongoose.Schema.Types.ObjectId, ref: "User"}
});
Now your post_new function should be like this.
post_new: async (req, res) => {
const title = req.body.title;
const article = req.body.article;
const id = req.params.id;
const post = await Post.create({
title: title,
article: article,
userId: id
});
console.log("Post has created");
res.redirect("/");
}
If you want to stick with your way then the create_new function should be like this.
post_new: async (req, res) => {
const title = req.body.title;
const article = req.body.article;
const id = req.params.id;
const post = new Post({
title: title,
article: article,
});
const {_id} = await post.save();
const user = await User.findById(id);
user.posts.push(_id);
await user.save();
console.log("Post has created");
res.redirect("/");
}