Mongoose populate with array of objects containing ref

Question

I have a Mongoose schema with an array lists of objects that consist of a reference to another collection and a nested array of numbers:

var Sch         


        

Answer 1

  // Cart schema  

 var CartSchema = new mongooseSchema({
        productDetails: [
            {
                productId: {
                    type: mongoose.Schema.ObjectId,
                    required: true,
                    ref:'Product'

                },
                productCount: Number,
            }
        ],
        UserId: {
            type: String,
            default: '',
            required: true,
            trim: true,
        },
        shopId: {
            type: String,
            default: '',
            required: true,
            trim: true,
        },
    });

  // add this .populate('productDetails.productId').

         db.Cart.find({
                        UserId: userId,
                        shopId: shopId
                    }).populate('productDetails.productId').skip(pagination.skip).limit(pagination.limit).exec(function (error, CartList) {

                        if (error) {
                            callback(error, null)
                        } else {
                            callback(null, CartList)
                        }
                    });