populating a key in an array of objects

Question

I am a new user to mongodb and have a doubt regarding how to populate particular key of every object in an array . here is the schema of the collection i want to populate

var Sub_cat = new mongoose.Schema({
    cat_id:{
        type: mongoose.Schema.Types.ObjectId,
        ref: "Cat"
    },
    name: String,
    quantity_type: String,
    selection_data:[{
        price:Number,
        selection_id:{
            type: mongoose.Schema.Types.ObjectId,
            ref: "Selection"
        }
    }]
});

here i wish to populate selection_id in selection_data array which i wish to further populate. can someone please help me out . Thank you !!

Possible duplicate of [Mongoose populate with array of objects containing ref](https://stackoverflow.com/questions/16641210/mongoose-populate-with-array-of-objects-containing-ref) — ambianBeing, Oct 28 '19 at 13:36

Shihab · Answer 1 · 2019-10-28T14:34:02.770

3

You should be able populate like this:

Sub_cat.find({}).populate("selection_data.selection_id")

edited Oct 28 '19 at 14:34

answered Oct 28 '19 at 12:20

Shihab

2,641
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score 1 · Answer 2 · answered Oct 28 '19 at 12:45

1

try this:

Sub_cat.find({}).select('selection_data').populate({path:'selection_id', model:"Selection")

answered Oct 28 '19 at 12:45

Babak Abadkheir

2,222
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46

populating a key in an array of objects

2 Answers2