How do I push to an array within an array in a collection with mongoose?

Question

I have a User schema created with Mongoose that holds a customer array, and inside that customer array there is another fleet array. I have figured out how to push to the customer array within the User schema , however I can not figure out how to loop through the customers, find the customer via id or name, and then push data into the fleet array.

Here is my User schema :

const mongoose = require('mongoose');

const UserSchema = new mongoose.Schema({
    username: {
        type: String,
        default: ''
    },
    password: {
        type: String,
        default: '',
    },
    registerDate: {
        type: Date,
        default: Date.now()
    },
    customer: [{
        name: {
            type: String,
            default: '',
        },
        email: {
            type: String,
            default: 'No email addresses found',
        },
        fleet: [{
            unitType: {
                type: String,
                default: 'No type selected',
            },
            unitNumber: {
                type: String,
                default: 'No unit number provided',
            },
            vinNumber: {
                type: String,
                default: 'No vin number provided'
            },
        }]
    }]
});

module.exports = mongoose.model('User', UserSchema);

I was able to figure out how to push a new customer into the customer array no problem. My problem is I do not get how I can loop through the customer array, and once I find the customer that I need, push data into the fleet array. I am really just stumped on how to word my Google search! Hopefully this is detailed enough, and please let me know if you need to see any other code.

Answer 1

You need to use positional '$' operation. Read here

UserSchema.update(
    {'customer.email':'xyz@email.com'},
    {
        $push:{
            'customer.$.fleet':<fleet object>
        }
    },function(err,result){

    })

--- OR ---

UserSchema.update(
    {'customer.email':'xyz@email.com'},
    {
        $set:{
             'customer.$.fleet':[fleet array]
        }
    },function(err,result){

    })

Hope this helps.