Question

我昨天工作得很好，做了一些改变，我不知道我是怎么打破它的。我确定这是一个错字，但我看不到它。

对表单中嵌套模型所做的任何更改都根本没有保存，开发日志显示了经过的属性 - 它们看起来格式正确，但它根本就没有更新。

我有一个User模型，其中references_one Biography就像这样：

# app/models/user.rb
class User
  include Mongoid::Document
  include Mongoid::Timestamps

  field :first_name, :type => String
  field :last_name, :type => String
  devise :database_authenticatable, :recoverable, :rememberable, :trackable, :validatable

  references_one :biography

  accepts_nested_attributes_for :biography
  #--snip---
end

# app/models/biography.rb
class Biography
  include Mongoid::Document
  include Mongoid::Timestamps

  field :content, :type => String
  field :role, :type => String
  field :is_crew, :type => Boolean

  referenced_in :user
end

最后我的表格（我在这里使用简单的表格，但大多数情况下它与表格形式非常相似）：

<%= simple_form_for [:manage, @user], :html => {:multipart => true}, :position => :left do |f| %>
  <h2>Login details</h2>
  <%= f.input :email, :input_html => {:class => "text"} %>      
  <%= f.input :first_name, :input_html => {:class => "text"} %>
  <%= f.input :last_name, :input_html => {:class => "text"} %>

  <div class="biography">
    <h2>Biography</h2>
    <%= f.simple_fields_for :biography do |biography_form| %>
      <%= biography_form.input :role, :input_html => {:class => "text"} %>
      <%= biography_form.input :content, :as => :text, :input_html => {:class => "textarea"} %>
      <%= biography_form.input :is_crew, :as => :boolean %>
    <%- end -%>
  </div>

  <%= f.submit "Save user", :class => "submit mid" %>
<% end %>

我的开发日志中有一些输出，但答案就在那里，我只是看不到它们：

    Started POST "/manage/users/john-doe" for 127.0.0.1 at Wed Dec 15 11:42:09 +1100 2010
      Processing by Manage::UsersController#update as HTML
      Parameters: {"commit"=>"Save user", "authenticity_token"=>"44QlHsbKb8Pm91wnxWJa8Y0QsUXDzp/3rVpfs3G1Inc=", "utf8"=>"✓", "id"=>"john-doe", "user"=>{"biography_attributes"=>{"is_crew"=>"0", "role"=>"Tenor", "id"=>"4d080de56a4f1dfe7700000e", "content"=>"John was born on the 1st of January, 1970."}, "last_name"=>"Doe", "first_name"=>"Johnathan", "email"=>"testing@involved.com.au"}}
    the_idea_of_north_development['users'].find({:_id=>BSON::ObjectId('4d06e6036a4f1dcb1b000001')}, {}).limit(-1)
    the_idea_of_north_development['users'].find({:slug=>"john-doe"}, {}).limit(-1)
    the_idea_of_north_development['biographies'].find({"user_id"=>BSON::ObjectId('4d080de06a4f1dfe7700000d')}, {}).limit(-1)
    the_idea_of_north_development['$cmd'].find({"count"=>"users", "query"=>{:_id=>{"$ne"=>BSON::ObjectId('4d080de06a4f1dfe7700000d')}, :email=>/^testing@involved\.com\.au$/i}, "fields"=>nil}, {}).limit(-1)
    the_idea_of_north_development['users'].find({"slug"=>"johnathan-doe"}, {})
    MONGODB the_idea_of_north_development['users'].update({"_id"=>BSON::ObjectId('4d080de06a4f1dfe7700000d')}, {"$set"=>{"slug"=>"johnathan-doe", "updated_at"=>Wed Dec 15 00:42:09 UTC 2010, "first_name"=>"Johnathan"}})
    Redirected to http://lvh.me:3000/manage/users
    Completed 302 Found in 17ms

对User模型的任何更改都会更新，但Biography的更改未保存。帮助我蜂拥而至，你是我唯一的希望！

Answer 1

我一直遇到类似的问题，嵌套文档的更改没有被持久化。（问题是How Do I Update Nested Mongo Document Attributes in Rails with Mongoid?）。我对Mongoid本身持怀疑态度，因为从未记录过以下消息以更新嵌入文档：

MONGODB the_idea_of_north_development['users'].update({"_id"=>BSON::ObjectId('4d080de06a4f1dfe7700000d')}, {"$set"=>{"slug"=>"johnathan-doe", "updated_at"=>Wed Dec 15 00:42:09 UTC 2010, "first_name"=>"Johnathan"}})

如果尝试进行嵌套文档的更新，则会有一条类似于选择父文档并设置嵌套文档值的行，例如：

the_idea_of_north_development['users'].update({"_id"=>PARENT_DOCUMENT}, {"$set"=>{"biography_attributes.is_crew"=>"0", "biography_attribute.role"=>"Tenor", etc...})

我个人认为Mongoid Issue #357可能是个原因。

Answer 2

在同一问题上被杀了两周。我设法做的唯一修复如下。在用户控制器中，执行以下操作：

if @user.save
params[:user][:biography_attributes].each do |bio|
         @biography = @user.biography.build({ :role => bio[:role], :iscrew => bio[:iscrew] })
    end

您将遍历所有传记实例并将其明确地保存到数据库中。

嵌套属性不为Mongoid中的references_one保存

2 个答案: