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我最近决定测试Nested Form。从安装 gem 到修改各自的模型，一切都很顺利......然后当我尝试实际的东西时，我的运气就用完了。

楷模

像所有其他友谊模型一样，User自引用为:friend.

class Share < ActiveRecord::Base
    belongs_to :user
    belongs_to :friend, :class_name => "User"
end

这是我的回形针模型：

class Upload < ActiveRecord::Base
    belongs_to :user
    has_attached_file :document

    FILE_FORMAT = ["Audio", "Document", "Image", "Video"]
end

这个是通过设计生成的：

class User < ActiveRecord::Base
    attr_accessor :login

    has_attached_file :image, :styles => { :medium => "120x120!" }

    has_many :uploads
    has_many :shares
    has_many :friends, :through => :shares
    has_many :inverse_shares, :class_name => "Share", :foreign_key => "friend_id"
    has_many :inverse_friends, :through => :inverse_shares, :source => :user

    accepts_nested_attributes_for :uploads
end

形式

这是我的非嵌套形式，它工作正常：

<%= simple_form_for(upload, defaults: { wrapper_html: { class: 'form-group' }, input_html: { class: 'form-control' } }, html: { multipart: true }) do |f| %>
    <%= f.input :file_name, label: "File Name:", input_html: {size: 19} %>
    <br /><br />
    <%= f.input :file_type, as: :select, collection: Upload::FILE_FORMAT, label: "File Type:" %>
    <br /><br />
    <%= f.input :document, as: :file, label: "File Path:" %>
    <br /><br />
    <%= f.submit "Upload File" %>
<% end %>

这是我要修复的形式：

<%= simple_nested_form_for @user, url: uploads_path(@user), html: { method: :post } do |f| %>
<%= f.fields_for :uploads do |ff| %>
  <%= ff.input :file_name, label: "File Name:", input_html: {size: 19} %>
  <br /><br />
  <%= ff.input :file_type, as: :select, collection: Upload::FILE_FORMAT, label: "File Type:" %>
  <br />
  <%= ff.input :document, as: :file, label: "File Path:" %>
  <br /><br />
  <%= ff.submit "Upload File" %>
  <br /><br />
<%= ff.link_to_remove "Remove Document" %>
<% end %>
<%= f.link_to_add "Add Document", :uploads %>
<% end %>

遇到的错误

A. 使用@upload（@upload = Upload.new在控制器中）给出一个ArgumentError in Uploads#new.

<%= simple_nested_form_for @upload, url: uploads_path(@upload), html: { method: :post } do |f| %>

Invalid association. Make sure that accepts_nested_attributes_for is used for :uploads association.

B. 我正在尝试修复的表单（请参阅表单部分，@user = current_user）似乎以编辑请求的形式出现。/uploads/new使用 all user 的相应值加载所有表单，:uploads而不是允许填写表单。

C. 通过相同的表格提交会param not found: upload出错。

ActionController::ParameterMissing in UploadsController#create

问题

嵌套形式应该如何纠正，以使其能够像正常形式一样发挥作用？

谢谢你。

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