Mongoose population issue at express.js - express

Question

Hello evryone i have issue last 2 days tryin to populate reviews on company list.
Im trying to get list of all companys with their reviews.
Every review is assigned to company Id.
On postman response i get empty array : []
Here is the code im having isuses with;
Company Model:
var mongoose = require("mongoose");
var Schema = mongoose.Schema;
var slug = require("mongoose-slug-generator");
mongoose.plugin(slug);
var CompanySchema = new Schema({
title: {type: String, required: true},
slug: { type: String, slug: "title" },
address: {type: String, required: true},
totalRating: {type: Number, required: false},
description: {type: String, required: false},
facebookLink: {type: String, required: false},
twitterLink: {type: String, required: false},
googleLink: {type: String, required: false},
linkedIn:{type: String, required: false},
instagramLink:{type: String, required: false},
contactNumber:{type: Number, required: false},
website:{type: String, required: false},
email:{type: String, required: false},
review: [{type: Schema.Types.ObjectId, ref: "Review"}],
user: { type: Schema.ObjectId, ref: "User", required: true },
}, {timestamps: true});
module.exports = mongoose.model("Company", CompanySchema);
Review Model :
var mongoose = require("mongoose");
var Schema = mongoose.Schema;
var ReviewSchema = new Schema({
title: {type: String, required: true},
description: {type: String, required: true},
rating: {type: String, required: true},
user: { type: Schema.ObjectId, ref: "User", required: true },
company: {type: Schema.ObjectId, ref:"Company"}
}, {timestamps: true});
module.exports = mongoose.model("Review", ReviewSchema);
And where i populate it :
exports.companyList = [
function (req, res) {
try {
Company.
find({id: req._id}).
populate("review").
then((companies)=>{
if(companies.length > 0){
return apiResponse.successResponseWithData(res, "Uspješno 1", companies);
}else{
return apiResponse.successResponseWithData(res, "Uspješno 2", []);
}
});
} catch (err) {
//Baci error 500...
return apiResponse.ErrorResponse(res, err);
}
}
];
Ive tryed evrything thanks infront.

Answer 1

Try changing in your Company Model
review: [{type: Schema.Types.ObjectId, ref: "Review"}]
to
review: {type: Schema.Types.ObjectId, ref: "Review"}
Then when you try to populate, I assume you either pass the _id of the company in your params or body of the request, so most likely:
req.params.id
or
req.body.id
the actual function:
module.exports = {
fncName: (req, res) => {
Company.findById(req.params.id)
.populate({
path: 'review',
})
.exec((err, company) => {
if (!err) {
if(companies.length > 0){
return apiResponse.successResponseWithData(res, "Uspješno 1", companies);
}else{
return apiResponse.successResponseWithData(res, "Uspješno 2", []);
}
}else {
console.log(err)
}
})
}
}
I am not sure how you register the router but it could look something like this:
const router = require ('express-promise-router')();
router.get('/get-company', nameOfTheController.fncName);
Note: to populate review from Company Model you do not necessarily need this line in your Review Model:
company: {type: Schema.ObjectId, ref:"Company"}