ruby - mongoid embeds_one 构建指南

Question

感谢您的宝贵时间!

代码很简单(mongoid没有使用rails):

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

我可以成功调用 office.addresses.build，如下所示。

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

但是当我调用 office.owner.build 时，会弹出错误提示

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

它应该以这种方式工作，对吗？哪里错了。

puts office.owner.class # NilClass

Answer 1

从 sleep 中恢复精神后......

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 就是我正在寻找的!