EDIT added mongoose.model.
I'm pretty new to mongodb and mongoose. I'm not able to populate books to authors in mongoose. Can anyone help me with that? Here is my code. I removed unnecessary fields
const authorSchema = mongoose.Schema({
_id:{
type: String,
required: true,
unique: true,
trim: true
},
name: {
type: String,
required: true,
trim: true
},
books: [{
type: String,
ref: "Book"
}]
}, {_id:false})
const Author = mongoose.model('Author', authorSchema)
module.exports = {Author}
And my books schema looks as following
const bookSchema = mongoose.Schema({
_id:{
type:String,
required:true,
unique:true,
trim: true
},
name: {
type: String,
required: true,
trim: true,
unique: true
},
description:{
type: String,
trim: true,
default: 'No description specified'
},
datePublished: {
type: Date,
trim: true,
default: '01/01/2001'
},
author:{
type: String,
ref: 'Author',
required: true
}
}, {_id:false})
const Book = mongoose.model('Book', bookSchema)
module.exports = {Book}
Here is the route to populate them together
AuthorRouter.get('/authors/:id', async(req, res)=>{
const authorID = req.params.id
try {
const author = await Author.findById(authorID)
try {
const populated = await author.populate({path: 'books.book', select: 'name description -_id'})
console.log(populated);
res.status(201).send(populated)
} catch (e) {
res.status(401).send(`${e}\n Unable to populate categories`)
}
} catch (error) {
res.status(401).send('Unable to find author')
}
})
Output is following with empty books array:
{
"_id": "123",
"name": "testuser",
"books": [],
"__v": 0
}
Populating an arrays of refs works the same way as a single ref. Just call the populate method on the query and an array of documents will be returned in place of the original _id's.
In your case that would be:
const populated = await author.populate({path: 'books', select: 'name description -_id'});
Hey i have modify your code , try to use this one
This is your author schema file
const Schema = mongoose.Schema;
const authorSchema = mongoose.Schema({
_id:{
type: String,
required: true,
unique: true,
trim: true
},
name: {
type: String,
required: true,
trim: true
},
books: [{
type: Schema.Types.ObjectId,
ref: "bookSchema"
}]
}, {_id:false})
const Author = mongoose.model('Author', authorSchema)
module.exports = {Author}
And this is your route
AuthorRouter.get('/authors/:id', async(req, res)=>{
const authorID = req.params.id
try {
const author = await Author.findById(authorID)
try {
const populated = await author.find().populate('books');
console.log(populated);
res.status(201).send(populated)
} catch (e) {
res.status(401).send(`${e}\n Unable to populate categories`)
}
} catch (error) {
res.status(401).send('Unable to find author')
}
})