mongoid embeds_one build howto

Question

谢谢你的时间！

代码很简单（没有导轨使用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

我可以成功拨打office.addresses.build。

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

但是当我拨打office.owner.build时，会弹出错误

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

它应该以这种方式工作，对吧？哪里错了。

puts office.owner.class # NilClass

Answer 1

从睡梦中恢复过来......

我使用puts office.methods列出office可以调用的所有方法。

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

office.build_owner正是我正在寻找的！