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

Actual answer:

Use this,

populate('lists.list')

Extra:

Here are lists are an array of objects (list). In JS you can access this like that,

console.log(lists.list);

and MongoDB syntax is 99% similar to JS syntax. so you can also populate this using lists.list.

Answer 2

lists: [
   {
      list: {
          type: Schema.ObjectId,
          require: true,
          ref: "List"
      },
      allocations: [
          {
              type: Number,
              required: true
          }
      ]
   }
],

=> Because it's an array of objects, you can do this -: Portfolio.populate('lists.list');

2.

lists: [
    {
        type: Schema.ObjectId,
        require: true,
        ref: "List"
    }
]

=> Because it's an array, you just have to do this -: Portfolio.populate('lists');

Answer 3

  // 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)
                        }
                    });

Answer 4

I found the answer: populate('lists.list') works. Thanks to this question: Mongoose populate within an object?