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谷歌找到答案，任何帮助都会很棒。 建筑物保存正确，但嵌入式文档PriorityArea不会更新... 我希望最终能够为新的优先领域创建一个新形式，但需要先更新。

Mongoid :: Errors :: BuildingsController中的InvalidFind #update

使用nil调用文档#find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])

它正确地从数据库中提供了正确的数据，但在构建#update时未能出错。非常感谢任何帮助。

---

更新 在建筑物#update im put params [：building] [：priority_areas_attributes] .to_yaml

哪些是

--- !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: ""

我猜测问题是空id：“”

Answer 1

问题是null id 它需要一个ObjectId才能正常工作。我这个愚蠢的错误。

Answer 2

我遇到了确切的问题。 simple_form自动将id参数传递给我的控制器，但它是空白的。

为什么嵌入式文档的ID为空？我猜是因为我通过mongoimport导入了父文档。如果我通过Web表单手动生成父文档，则嵌入的文档具有预期的ID。

以下是我的解决方法：

class Foo
  include Mongoid::Document

  embeds_many :bars
  accepts_nested_attributes_for :bars

  ####
  # simple_form_for / embedded document workaround
  #
  # Because simple_form wants to provide the ID for an existing object, 
  # it will output a blank ID because imported embedded documents
  # have an ID of nil.
  #
  # Intercept it to avoid 
  #   Mongoid::Errors::InvalidFind in FoosController#update

  def bars_attributes=(attribs)
    attribs.each do |key, value|
      index = key.to_i
      fixed_attrib = value.delete_if { |k,v| k=="id" and v=="" }
      self.bars[index].update_attributes(fixed_attrib)
    end
  end


end

class Bar
  include Mongoid::Document

  embedded_in :foo
end