persist embeds_one relation mongoid - ruby-on-rails

Question

class Order
include Mongoid::Document
include Mongoid::Timestamps
#relationships
embeds_one :user_detail
#fields
field :description
#validations
validates :user_detail, presence: true
end
This the embedded object in order:
class UserDetail
include Mongoid::Document
include Mongoid::Timestamps
#fields
field :name, :type => String
field :zip_code, :type => String
field :email, :type => String
# Relationships
embedded_in :order
#validations
validates_presence_of :name, :zip_code, :email
end
I want save/persist on mongodb order object with user_detail object embedded_in order object.
I have tried with:
order = Order.new(description: "checking description")
order.user_detail = Order.new(:name => "John", :zip_code => "26545", :email => "john#john.com")
order.save!
but I get validation fail:
o.save!
Mongoid::Errors::Validations:
Problem:
Validation of Order failed.
Summary:
The following errors were found: User detail is invalid
Resolution:
Try persisting the document with valid data or remove the validations....
How can I fix this problem? I'm using mongoid 3.x

Answer 1

Should be:
order = Order.new(description: "checking description")
order.user_detail = UserDetail.new(:name => "John", :zip_code => "26545", :email => "john#john.com")
order.save!
You had Order.new for OrderDetail.new

Answer 2

You do not need to manually create user_detail using
order.user_detail = UserDetail.new...
order.save!
The embedded user_detail will be created automatically if u add autobuild attribute
embeds_one :user_detail autobuild: true
If u wanna persist user_detail in database as well, do not forget to add
validates_presence_of :user_detail
or you will not see the persisted user_detail in mongo db.