CODEWITHSUNDEEP
node.jsmongodbmongoose
PieterJan
PieterJan

Reputation: 105

NodeJS Mongoose mapping of data

I'm making a hire platform for cars. Now i used mongoose, setup my models and found out i can't populate a reference that's too deep.

I got 2 models: Cars and Types and Customers. I'm trying to receive everything from my Customers like placed orders. The response i'm getting currently is the one below.

"slug": "myslug",
"note": "",
"isReturned": false,
"includedKM": "0",
"price": "0",
"car": {
  "type": "_id"
}

I got the car to populate but i can't seem to get the type to populate. I tried things like .populate('car.type') but with no result. I looked this up and apparently it's too deep to populate so i came up with a solution to bypass this. 

const customer = req.customer;

Order.find({'customer': customer.slug}).populate('car').then(function(orders){

        Car.find(orders).populate('type').then(function(types){
            return res.json(types);
        });


    });

The types i'm getting now are the populated types from the cars. Now i want to swap the content of the car.type to this result and generate my own populated response.

Anyone any clue how to do this? It's probably pretty easy since i have the type_id in both. Just need to map the data from one to the other.

Thanks in advance!

Upvotes: 0

Views: 2390

Answers (3)

Himanshu
Himanshu

Reputation: 855

Send value of car type as parameter or get it inside request in a variable value.

After that you can do it like this:

 Order.findOneAndUpdate({customer: customer.slug}, {$set: {car.type: value}}, function (err, customer) {
       if (err) {
           return res.status(500).json({
               title: 'An error occured',
               error: err
           });
       }
    res.status(201).json({
            message: 'Success',
            obj: customer
        });
});

Upvotes: 0

Idan Dagan
Idan Dagan

Reputation: 11585

Since mongoose 4 you can populate documents across multiple levels.

Maybe this post will help you. mongoose - populate sub-schema sub-array

Upvotes: 1

PieterJan
PieterJan

Reputation: 105

Found a solution to this problem. Apparently there is a plugin for mongoose (deep-populate) that allows you to populate 2nd grade child references

Upvotes: 0

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