mongoid embeds_one build howto

Question

感謝您的時間！

代碼很簡單（無軌使用mongoid）：

require 'mongoid' # version 6.0.2 

Mongoid.load!('mongoid.yml', :development) 

class Office 
    include Mongoid::Document 

    embeds_one :owner 
    embeds_many :addresses 
end 

class Owner 
    include Mongoid::Document 
end 

class Address 
    include Mongoid::Document 
end 

我可以成功調用office.addresses.build如下。

office = Office.new 
office.addresses.build 
office.save 

但是，當我打電話office.owner.build，錯誤彈出說

embed_one.rb:23:in `<main>': undefined method `build' for nil:NilClass (NoMethodError) 

它應該以這種方式工作的，對不對？哪裏錯了。

puts office.owner.class # NilClass 

Answer 1

刷新自己後從睡眠......

我用puts office.methods列出所有的方法office可以調用。

# Here's all the methods has *owner* in it 
owner= 
owner? 
has_owner? 
build_owner 
create_owner 
owner 

office.build_owner是我在找什麼！