添加名称设计的用户登录抛出一个NoMethodError

Question

好吧，所以我试图添加一个名称条目到我的登录页面使用设计，这里是我到目前为止在视图/ devise/new.html.erb文件。

<h2>Sign up</h2> 

<div class="row"> 
    <div class="col-md-8"> 
    <%= form_for(resource, as: resource_name, url: registration_path(resource_name)) do |f| %> 
     <%= devise_error_messages! %> 
     <div class="form-group"> 
     <%= f.label :name %> 
     <%= f.text_field :name, autofocus: true, class: 'form-control', placeholder: "Enter name" %> 
     </div> 
     <div class="form-group"> 
     <%= f.label :email %> 
     <%= f.email_field :email, class: 'form-control', placeholder: "Enter email" %> 
     </div> 
     <div class="form-group"> 
     <%= f.label :password %> 
     <%= f.password_field :password, class: 'form-control', placeholder: "Enter password" %> 
     </div> 
     <div class="form-group"> 
     <%= f.label :password_confirmation %> 
     <%= f.password_field :password_confirmation, class: 'form-control', placeholder: "Enter  password confirmation" %> 
     </div> 
     <div class="form-group"> 
     <%= f.submit "Sign up", class: 'btn btn-success' %> 
    </div> 
     <div class="form-group"> 
     <%= render "devise/shared/links" %> 
     </div> 
    <% end %> 
    </div> 
</div> 

我知道你必须扩展Devise允许的属性，我将这个代码添加到我的应用程序的控制器。

protect_from_forgery with: :exception 
    before_action :configure_permitted_parameters, if: :devise_controller? 

    protected 

    def configure_permitted_parameters 
     devise_parameter_sanitizer.for(:sign_up) << :name 
    end 

我也做了一定补充：这里名更改为DB /迁移/ devise_create_users

class DeviseCreateUsers < ActiveRecord::Migration 
    def change 
    create_table(:users) do |t| 
     ## Customization 
     t.string :name 
     ## Database authenticatable 
     t.string :email,    null: false, default: "" 
     t.string :encrypted_password, null: false, default: "" 

我确信耙分贝：迁移和db：复位，但我发现了这个错误，这对我没有意义。

Started GET "https://stackoverflow.com/users/sign_up" for 127.0.0.1 at 2014-12-06 15:07:31 +0300 
    ActiveRecord::SchemaMigration Load (0.1ms) SELECT "schema_migrations".* FROM "schema_migrations" 
Processing by Devise::RegistrationsController#new as HTML 
    Rendered devise/registrations/new.html.erb within layouts/application (235.8ms) 
Completed 500 Internal Server Error in 251ms 

ActionView::Template::Error (undefined method `name' for #<User:0x007fe82225b928>): 
6:  <%= devise_error_messages! %> 
7:  <div class="form-group"> 
8:   <%= f.label :name %> 
9:   <%= f.text_field :name, autofocus: true, class: 'form-control', placeholder: "Enter name" %> 
10:  </div> 
11:  <div class="form-group"> 
12:   <%= f.label :email %> 
    app/views/devise/registrations/new.html.erb:9:in `block in  _app_views_devise_registrations_new_html_erb__738282397383517404_70317490899320' 
    app/views/devise/registrations/new.html.erb:5:in `_app_views_devise_registrations_new_html_erb__738282397383517404_70317490899320' 


Rendered /Users/clydiscope/.rvm/gems/ruby-2.1.5/gems/actionpack- 4.1.8/lib/action_dispatch/middleware/templates/rescues/_trace.html.erb (0.9ms) 
Rendered /Users/clydiscope/.rvm/gems/ruby-2.1.5/gems/actionpack-4.1.8/lib/action_dispatch/middleware/templates/rescues/_request_and_response.html.erb (0.9ms) 
Rendered /Users/clydiscope/.rvm/gems/ruby-2.1.5/gems/actionpack-4.1.8/lib/action_dispatch/middleware/templates/rescues/template_error.html.erb within rescues/layout (7.3ms) 

任何人都可以帮忙吗？

Answer 1

看起来像这里的问题是你编辑你的一个迁移文件并重新运行迁移。创建迁移文件并运行rake db:migrate后，除非回滚到该特定文件，否则无法编辑该文件。

在您的情况下，您可以创建一个新迁移，将name列添加到users表中。

$ rails g migration add_name_to_users 

然后编辑文件。

def up 
    add_column :users, :name, :string 
end 

def down 
    remove_column :users, :name 
end 

现在你可以运行rake db:migrate