Question

我有一个使用嵌套模型的注册表单。客户可以拥有多个用户，User属于Client。在注册表单上，我希望能够同时注册客户端和用户。但是，我一直在为用户提供“无法大量分配”，因为我有accepts_nested_attributes_for :users，所以我不明白。

<h1>Sign Up</h1>
<%= form_for @client do |client_form| %>
  <% if @client.errors.any? %>
    <div class="error_messages">
      <h2>Form is invalid</h2>
      <ul>
        <% for message in @client.errors.full_messages %>
          <li><%= message %></li>
        <% end %>
      </ul>
    </div>
  <% end %>
  <div class="field">
    <%= client_form.label :business_name %>
    <%= client_form.text_field :business_name %>
  </div>


    <%= client_form.fields_for :user do |user_form| %>  
      <div class="field">
        <%= user_form.label :first_name %>
        <%= user_form.text_field :first_name %>
      </div>
      </div>
        <div class="field">
        <%= user_form.label :last_name %>
        <%= user_form.text_field :last_name %>
      </div>  
      <div class="field">
        <%= user_form.label :username %>
        <%= user_form.text_field :username %>
      </div>
      <div class="field">
        <%= user_form.label :password %>
        <%= user_form.password_field :password %>
      </div>
      <div class="field">
        <%= user_form.label :password_confirmation %>
        <%= user_form.password_field :password_confirmation %>
      </div>
    <% end %> 

  <div class="actions"><%= client_form.submit %></div>
<% end %>


  class Client < ActiveRecord::Base

  attr_accessible :business_name
  attr_accessible :users_attributes

  has_many :users
  has_many :items

  accepts_nested_attributes_for :users, allow_destroy: true

  ...
  end

  class User < ActiveRecord::Base
  attr_accessible :client_id, :first_name, :last_name, :username, :password, :password_confirmation
  belongs_to :client

  has_secure_password
  ....
  end

错误

ActiveModel::MassAssignmentSecurity::Error - Can't mass-assign protected attributes: user:
  (gem) activemodel-3.2.11/lib/active_model/mass_assignment_security/sanitizer.rb:48:in `process_removed_attributes'
  (gem) activemodel-3.2.11/lib/active_model/mass_assignment_security/sanitizer.rb:20:in `debug_protected_attribute_removal'
  (gem) activemodel-3.2.11/lib/active_model/mass_assignment_security/sanitizer.rb:12:in `sanitize'
  (gem) activemodel-3.2.11/lib/active_model/mass_assignment_security.rb:230:in `sanitize_for_mass_assignment'
  (gem) activerecord-3.2.11/lib/active_record/attribute_assignment.rb:75:in `assign_attributes'
  (gem) activerecord-3.2.11/lib/active_record/base.rb:497:in `initialize'
  app/controllers/clients_controller.rb:45:in `new'
  app/controllers/clients_controller.rb:45:in `create'
  (gem) actionpack-3.2.11/lib/action_controller/metal/implicit_render.rb:4:in `send_action'
  (gem) actionpack-3.2.11/lib/abstract_controller/base.rb:167:in `process_action'
  (gem) actionpack-3.2.11/lib/action_controller/metal/rendering.rb:10:in `process_action'
  (gem) actionpack-3.2.11/lib/abstract_controller/callbacks.rb:18:in `block in process_action'
  (gem) activesupport-3.2.11/lib/active_support/callbacks.rb:414:in `_run__330478543754893527__process_action__2034132490286778675
__callbacks'

这里有什么问题？

Answer 1

更改

<%= client_form.fields_for :user do |user_form| %>

到

<%= client_form.fields_for :users do |user_form| %>

由于client_form引用了您的客户端模型和模型has_many :users，因此您需要确保在使用嵌套表单字段时，使用:users作为符号。另外，请确保您的客户端模型中有attr_accessible :users_attributes。

Answer 2

在您的客户端模型中尝试添加此方法：
def initialize（* args）
self.users.build
结束

OR

在你的控制器新动作中添加：
@user = @ client.users.build

Answer 3

只是一个猜测，但这有助于改变其中一条或两条线吗？

attr_accessible :users_attributes
accepts_nested_attributes_for :users, allow_destroy: true

到

attr_accessible :user_attributes
accepts_nested_attributes_for :user, allow_destroy: true

无法批量分配受保护的属性：user

3 个答案: