Hi.

I'm using Mongoid 4.0.0 in a Rails 4.1.4 app.

Your docs say the following for REFERENCED 1-1 relations:

>Model#

=
>Set the child document. If the parent document is persisted, then the child will be saved immediately. If setting to nil then the child will be deleted.

Given I have, for example, the following models:

class Parent
include Mongoid::Document

has_one :child
end

class Child
include Mongoid::Document

belongs_to :parent
end

If I do the following:

p = Parent.new
c = Child.new
p.child = c
p.save

It only persists the Parent, not the Child, contradicting your documentation. Is this a bug?, or am I not clear about something?, or missing something?.

Would appreciate your response.

Best regards.