Mongoose populate not populating - javascript

I am trying to populate my users car inventory. All the cars have a userId attached to them when they are created but when I go to populate the inventory it doesn't work and I get no errors.
Here are my models:
User.js
let UserSchema = mongoose.Schema({
username: {
type: String,
required: true,
unique: true
},
password: {
type: String,
required: true
},
inventory: [{ type: mongoose.Schema.Types.ObjectId, ref: 'Car' }]
});
let User = mongoose.model('User', UserSchema);
models.User = User;
Cars.js
let CarSchema = mongoose.Schema({
userId: {
type: mongoose.Schema.Types.ObjectId,
ref: 'User'
},
make: {
type: String,
required: true
},
model: {
type: String,
required: true
},
year: {
type: String
}
});
let Car = mongoose.model('Car', CarSchema);
models.Car = Car;
Here is the populate code:
router.route('/users/:user/inventory').get((req, res) => {
User.findById(userId)
.populate('inventory')
.exec((err, user) => {
if (err) {
console.log("ERRROORRR " + err)
return res.send(err);
}
console.log('Populate ' + user)
res.status(200).json({message: 'Returned User', data: user});
});
});
};
This is what a car object looks like in the database:
{
"_id": ObjectId("5759c00d9928cb581b5424d0"),
"make": "dasda",
"model": "dafsd",
"year": "asdfa",
"userId": ObjectId("575848d8d11e03f611b812cf"),
"__v": 0
}
Any advice would be great! Thanks!

Populate in Mongoose currently only works with _id's, though there's a long-standing issue to change this. You'll need to make sure your Car model has an _id field and that the inventory field in User is an array of these _id's.
let CarSchema = new mongoose.Schema(); //implicit _id field - created by mongo
// Car { _id: 'somerandomstring' }
let UserSchema = new mongoose.Schema({
inventory: [{
type: mongoose.Schema.Types.ObjectId,
ref: 'Car'
}]
});
// User { inventory: ['somerandomstring'] }
User.populate('inventory')

Related

Mongoose $or condition for nested array

There are my schemas
//ProjectModel
const ProjectSchema: Schema = new Schema(
owner: { type: Schema.Types.ObjectId, ref: "User" },
users: [{type: Schema.Types.ObjectId, ref: "ProjectUser", unique: true }]
);
//Project User model
const ProjectUserSchema = new Schema(
{
user: { type: Schema.Types.ObjectId, ref: "User", require: true },
role: {
type: String,
default: 'basic',
enum: ["basic", "projectuser", "moderator", "admin"]
},
project: { type: Schema.Types.ObjectId, ref: "Project", require: true },
},
{
timestamps: true,
usePushEach: true,
}
);
The User model has common fields like password, name, etc.
I want to find User of a ProjectModel either among the owner (UserSchema) or among users (ProjectUserSchema)
ProjectModel.findOne()
.or([{ owner: req.params.user }, { "users.user": req.params.user }])
.then(project => {
res.json(project);
});
But it returns null. And condition .or([{ owner: req.params.user }, { "users._id": "PROJECT USER ID" }]) doesn't work either.
What should I do?
You need to convert the incoming req.params.user from string to ObjectId. Try this:
const mongoose = require('mongoose');
const getProjectByUser = (req, res) => {
let userId = mongoose.Types.ObjectId(req.params.user);
ProjectModel
.findOne({
$or: [
{ "owner": userId },
{ "users": userId }
]
})
.then(project => {
res.json(project);
})
.catch(e => {
res.json({ error: "Error!" });
});
}

posts.populate is not a function

I'm trying to populate my post's author fields (which is are object ids) with the corresponding author objects which are in a separate collection.
My controller code is as follows:
exports.readPosts = async (req, res) => {
try {
const posts = await Post.find({ board: req.params.board });
await posts.populate("author").execPopulate();
res.send(posts);
} catch (err) {
res.status(400).send(err.message);
}
};
I'm at a loss as to why this isn't working as I have very similar code in another controller method that is working just fine.
All help greatly appreciated.
Below is the relevant Model file:
const mongoose = require("mongoose");
const postSchema = new mongoose.Schema(
{
title: {
type: String,
required: true,
trim: true,
},
content: { type: String, required: true, trim: true },
comments: [
{
comment: {
type: String,
required: true,
trim: true,
},
user: {
type: mongoose.Schema.Types.ObjectId,
ref: "User",
},
date: {
type: Date,
default: Date.now(),
},
},
],
author: {
type: mongoose.Schema.Types.ObjectId,
required: true,
ref: "User",
},
board: {
type: mongoose.Schema.Types.ObjectId,
required: true,
ref: "Board",
},
},
{ timestamps: true }
);
const Post = mongoose.model("Post", postSchema);
module.exports = Post;
posts is an array of models. populate must be called on a model. The preferred way to do this is at query time. It probably works on your other controller because you are using a findOne so it is returning the model, not the Array.
const posts = Post
.find({ board: req.params.board })
.populate('author')
.exec();

Why mongoose populate doesn't work when populating an array?

I have 2 schemas:
const mongoose = require('mongoose');
const PinSchema = new mongoose.Schema({
title: String,
content: String,
image: String,
latitude: Number,
longitude: Number,
author: {
type: mongoose.Schema.ObjectId,
ref: "User"
},
comments: [
{
text: String,
createdAt: {
type: Date,
default: Date.now,
author: {
type: mongoose.Schema.ObjectId,
ref: "User"
}
}
}
]
}, { timestamps: true });
module.exports = mongoose.model("Pin", PinSchema);
and
const mongoose = require('mongoose');
const UserSchema = new mongoose.Schema({
name: String,
email: String,
picture: String
});
module.exports = mongoose.model("User", UserSchema);
As you can see author field in Pin is the same as the _id in User schema.
I then try to populate the comments author field in the Pin schema like this:
const pinUpdated = await Pin.findOneAndUpdate(
{ _id: pinId },
{ $push: { comments: "some comment" } },
{ new: true }
).populate("author")
.populate("comments.author");
however the result object has author field set to null so population doesn't work.
I'm not against doing this with native mongo syntax using $lookup but in my case it's not just looking up an array it's looking up a field of an objects array:
db.pins.aggregate([
{
$lookup:
{
from: "users",
localField: "comments._id", // this won't work
foreignField: "_id",
as: "authorOutput"
}
}
])
what am I missing in populate()?
It looks like your author field in the comments array is nested inside the createdAt object, which is likely unintentional. Changing PinSchema to the following (closing curly brace before author) should fix it:
const PinSchema = new mongoose.Schema({
...
comments: [
{
text: String,
createdAt: {
type: Date,
default: Date.now,
},
author: {
type: mongoose.Schema.ObjectId,
ref: "User"
}
}
]
}, { timestamps: true });

how to populate users object with field

These the response for user that Im getting from get request to profile API
"user": "5cc3a4e8d37a7259b45c97fe"
What I'm looking for instead is
"user":{
"_id": "5cc3a4e8d37a7259b45c97fe",
"name":"Jhon Doe",
}
Here is my code:
Profile.findOne({
user: req.user.id
})
.populate('user',['name']) // I added this line to populate user object with name
.then(profile=>{
if(!profile){
errors.noprofile = 'There is no profile for this user'
return res.status(404).json(errors);
}
res.json(profile)
})
.catch(err => res.status(404).json(err));
However, Im getting these error:
{
"message": "Schema hasn't been registered for model \"users\".\nUse mongoose.model(name, schema)",
"name": "MissingSchemaError"
}
What am I missing
Profile Schema
const ProfileSchema = new Schema({
user:{
type: Schema.Types.ObjectId,
ref: 'users'
},
handle: {
type: String,
required: true,
max: 40
},
company: {
type: String
},
website: {
type: String,
}
})
Here is how my Users schema looks like
const mongoose = require('mongoose');
const Schema = mongoose.Schema;
// Create Schema
const UserSchema = new Schema({
name:{
type: String,
required: true,
},
email:{
type: String,
required: true,
},
password:{
type: String,
required: true,
},
avator:{
type: String,
},
date:{
type: Date,
default: Date.now,
}
});
module.exports = User = mongoose.model('Users', UserSchema)
Schema that you are referencing in Profile schema is users, but you have saved your user schema as Users. So I would say that you need to update your Profile schema:
const ProfileSchema = new Schema({
user:{
type: Schema.Types.ObjectId,
ref: 'Users'
},
handle: {
type: String,
required: true,
max: 40
},
company: {
type: String
},
website: {
type: String,
}
})
Name under which is saved your User schema can be found in this line
module.exports = User = mongoose.model('Users', UserSchema)
The error says you don't have Schema for Users. You reference it from Profile Schema, but you don't have it. It can be this way:
const Users = new Schema({
name: String
})

Mongoose schema : SubDocument field only unique per Document

I have a little question. I have a User schema which contains a table fields redirecting to the Table schema.
A Table element can contain a name, I want this name to be unique per User but not between User.
Example:
User1 -> Table1.name: "foo"
User2 -> Table1.name: "foo"
But this User1 -> Table2.name: "foo" cannot be possible.
This is the User Schema:
var UserSchema = new mongoose.Schema({
username: { type: String, required: true, index: {
unique: true } },
email: { type: String, required: true, index: {unique: true } },
password: { type: String, required: true },
tables: [{ type: Schema.Types.ObjectId, ref: 'Table' }],
resetPasswordToken: String,
resetPasswordExpires: Date,
uuid: String,
});
This is the Table schema:
var TableSchema = Schema({
name: { type: String, required: true, index: { unique: true }},
logos: [{ type: Schema.Types.ObjectId, ref: 'Logo'}],
});
And this is where I do the queries:
app.post('/newTab', function(req, res){
var use = req.user.username;
var newTab = new Table({
name: req.body.name,
});
newTab.save(function(err, docs){
if (err)
{
console.error(err);
res.writeHead(500);
res.end();
}
else
{
User.findOne({username: req.user.username}, function(err, docs) {
if(err) {throw (err);}
else
{
docs.tables.push(newTab);
docs.save(function(err, docs){
if (err) return console.error(err);
res.writeHead(200);
res.end(userId);
});
}
});
}
});
For now, I cannot add the same table name for two different User ..
I also tried something with sparse index but can't figure how it works

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