ruby-on-rails - 无法批量分配 protected 属性 : user

Question

我有一个使用嵌套模型的注册表单。客户端可以有多个用户，一个用户属于一个客户端。在注册表单上，我希望能够同时注册客户和用户。但是，我不断收到用户的“无法批量分配”消息，我不明白，因为我有 accepts_nested_attributes_for :users。

<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'

这里出了什么问题？

Answer 1

改变

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

至

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

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