mongoid - 嵌套表单，嵌入式文档，Mongoid 2.2.0问题

Question

我似乎无法在这里或通过Google找到答案，任何帮助都很棒。
建筑物可以正确保存，但是嵌入式文档PriorityArea不会更新...
我想最终让它均匀地为新的优先级区域添加一个新表格，但是需要首先对其进行更新。
BuildingsController＃update中的Mongoid::Errors::InvalidFind
调用Document＃find为nil无效

class Building
  include Mongoid::Document
  embeds_many :priority_areas
  accepts_nested_attributes_for :priority_areas, :allow_destroy => true, :autosave => true
end

class PriorityArea
  include Mongoid::Document
  embedded_in :building, :inverse_of => :priority_areas
end

#view

= form_for [@customer, @building] do |f|
  ...
  ...
  = f.fields_for :priority_areas do |pa|
    = f.name
    ...
    ...

#controller

@building.update_attributes(params[:building])

它可以正确地从数据库中获取正确的数据，但是无法在建筑#update上出错。任何帮助是极大的赞赏。

更新
在建筑物中#update im
放置params [:building] [:priority_areas_attributes] .to_yaml
哪个屈服

--- !map:ActiveSupport::HashWithIndifferentAccess 
"0": !map:ActiveSupport::HashWithIndifferentAccess 
name: area 51
location: near front door
notes: ""
priority: "1"
id: ""
"1": !map:ActiveSupport::HashWithIndifferentAccess 
name: area 52
location: near rear door
notes: ""
priority: "2"
id: ""

我猜问题出在null ID:“”

Answer 1

问题是空ID
它需要有一个ObjectId才能正常工作。我的愚蠢错误。