Mongoose: deep population (populate a populated field)

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Firstly, update mongoose 3 to 4 & then use the simplest way for deep population in mongoose as shown below:

Suppose you have Blog schema having userId as ref Id & then in User you have some review as ref Id for schema Review. So Basically, you have three schemas:

  1. Blog
  2. User
  3. Review

And, you have to query from blog, which user owns this blog & the user review.
So you can query your result as :

BlogModel
  .find()
  .populate({
    path : 'userId',
    populate : {
      path : 'reviewId'
    }
  })
  .exec(function (err, res) {

  })

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