How to do nested populate in mongodb?

Question

router.get('/', (req, res) => {
Post.find()
    .populate("author")
    .populate("comments")
    .populate("commentedBy")
    .sort({date : -1})
    .exec()
    .then(posts => res.json(posts));
});

here i am populating the comments from the comment model and then populating the 'commentedBy' from the comment model. The last populating is not working. I am getting {commentedBy: Null, ...}

Try this .populate({ path: "comments", populate: { path: "commentedBy" }}) — Ashh
– Ashh, Commented Sep 26, 2018 at 7:43

Atishay Jain · Accepted Answer · 2018-09-26 07:45:34Z

1

Made some changes in your code. In your case comments are inside commentedBy so first you populate comments then you populate commentedBy inside it.

router.get('/', (req, res) => {
Post.find()
    .populate("author")
    .populate({ path: 'comments', populate: { path: 'commentedBy' } })
    .sort({date : -1})
    .exec()
    .then(posts => res.json(posts));
});

answered Sep 26, 2018 at 7:45

Atishay Jain

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2 Comments

Sujoy Over a year ago

What will be the syntax if I want to populate two children in 2nd level, like if i want to populate comments and rating in the fourth line??

Atishay Jain Over a year ago

populate({ path: 'comments', populate: { path: 'commentedBy', populate: [{ path: 'comments '}, { path: 'ratings'}] } }) is this what you're asking?

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