embedded_in – resolving children

The embedded_in method tells us in which object this is embedded. It's very important that this should be configured when we are setting up the embedded relations.

Tip

Without the embedded_in method in the model, the document would not get embedded at all. This is because the method is used to find the inverse relation!

class Review
  include Mongoid::Document

   embedded_in :book
end

This tells Mongoid that the review document is embedded inside the book.