Ruby on rails Rails:designe:Undefined方法`username'；

在使用Desive时，当我尝试加载带有新字段“username”的注册页面时，我不断遇到此错误

通过前面的问题，我通过终端发送了以下命令：

rake db:schema:load

该错误甚至不允许我访问该页面。与单击“注册”后出现的其他问题不同

编辑

重新启动服务器几次后，它现在会自动退出本地服务器，并出现以下错误：

Called from: /usr/local/rvm/gems/ruby-1.9.3-p194/gems/actionpack-     3.2.8/lib/action_dispatch/middleware/session/abstract_store.rb:28:in `initialize'.
Exiting
/usr/local/rvm/gems/ruby-1.9.3-p194/gems/activesupport-3.2.8/lib/active_support/dependencies.rb:469:in `load': /Users/hunter/first_app/app/models/view.rb:11: syntax error, unexpected keyword_end (SyntaxError)

编辑

这在models/view.rb中：

class View < ActiveRecord::Base
  # Include default devise modules. Others available are:
  # :token_authenticatable, :confirmable,
  # :lockable, :timeoutable and :omniauthable
  devise :database_authenticatable, :registerable,
     :recoverable, :rememberable, :trackable, :validatable

  # Setup accessible (or protected) attributes for your model
  attr_accessible :username, :email, :password, :password_confirmation, :remember_me,
  # attr_accessible :title, :body
end

类视图

编辑

---

我在models/view.rb中删除了：memory_me结尾的逗号，现在服务器可以工作了。我现在可以在localhost:3000上加载它了。然而，当我点击注册页面时，我得到了与以前相同的错误

如果您想使用用户名或密码登录，这里有一个很好的解释：

如果只想使用用户名登录，则必须从designe.rb配置文件中更改身份验证密钥：

  # ==> Configuration for any authentication mechanism
  # Configure which keys are used when authenticating a user. The default is
  # just :email. You can configure it to use [:username, :subdomain], so for
  # authenticating a user, both parameters are required. Remember that those
  # parameters are used only when authenticating and not when retrieving from
  # session. If you need permissions, you should implement that in a before filter.
  # You can also supply a hash where the value is a boolean determining whether
  # or not authentication should be aborted when the value is not present.
  config.authentication_keys = [ :username ]

此外，您还必须根据身份验证密钥修改注册和会话视图

在design/registrations/new.html.erb中：

3: <%= simple_form_for(resource, :as => resource_name, :url => registration_path(resource_name), html: { class: 'form-horizontal'}) do |f| %>
4: <%= f.error_notification %>
5:
6: <%= f.input :username %>
7: <%= f.input :password %>
8: <%= f.input :password_confirmation %>
9:
10: <%= f.submit "Sign up" %>

3: <%= simple_form_for(resource, :as => resource_name, :url => registration_path(resource_name), html: { class: 'form-horizontal'}) do |f| %>
4: <%= f.error_notification %>
5:
6: <%= f.input :username %>

3: <%= simple_form_for(resource, :as => resource_name, :url => registration_path(resource_name), html: { class: 'form-horizontal'}) do |f| %>
4:
5: <%= f.input :username %>
6: <%= f.input :password %>
7:
8: <%= f.submit "Sign in" %>

3:resource_name，:url=>registration_path（resource_name），html:{class:'form horizontal'}）do | f |%>
4: 
5:
6: 
7: 
8: 
9:
10: 

在designe/registrations/edit.html.erb中：

3: <%= simple_form_for(resource, :as => resource_name, :url => registration_path(resource_name), html: { class: 'form-horizontal'}) do |f| %>
4: <%= f.error_notification %>
5:
6: <%= f.input :username %>
7: <%= f.input :password %>
8: <%= f.input :password_confirmation %>
9:
10: <%= f.submit "Sign up" %>

3: <%= simple_form_for(resource, :as => resource_name, :url => registration_path(resource_name), html: { class: 'form-horizontal'}) do |f| %>
4: <%= f.error_notification %>
5:
6: <%= f.input :username %>

3: <%= simple_form_for(resource, :as => resource_name, :url => registration_path(resource_name), html: { class: 'form-horizontal'}) do |f| %>
4:
5: <%= f.input :username %>
6: <%= f.input :password %>
7:
8: <%= f.submit "Sign in" %>

3:resource_name，:url=>registration_path（resource_name），html:{class:'form horizontal'}）do | f |%>
4: 
5:
6: 

在designe/sessions/new.html.erb中：

3: <%= simple_form_for(resource, :as => resource_name, :url => registration_path(resource_name), html: { class: 'form-horizontal'}) do |f| %>
4: <%= f.error_notification %>
5:
6: <%= f.input :username %>
7: <%= f.input :password %>
8: <%= f.input :password_confirmation %>
9:
10: <%= f.submit "Sign up" %>

3: <%= simple_form_for(resource, :as => resource_name, :url => registration_path(resource_name), html: { class: 'form-horizontal'}) do |f| %>
4: <%= f.error_notification %>
5:
6: <%= f.input :username %>

3: <%= simple_form_for(resource, :as => resource_name, :url => registration_path(resource_name), html: { class: 'form-horizontal'}) do |f| %>
4:
5: <%= f.input :username %>
6: <%= f.input :password %>
7:
8: <%= f.submit "Sign in" %>

3:resource_name，:url=>registration_path（resource_name），html:{class:'form horizontal'}）do | f |%>
4:
5: 
6: 
7:
8: 

有点晚了，但我想分享我的答案，因为我遇到了同样的错误。移民是不够的。您需要将此代码位添加到

应用程序\u controller.rb

：

before_action :configure_permitted_parameters, if: :devise_controller?

  protected

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

在\u操作之前：配置\u允许的\u参数，如果：：设计\u控制器？
受保护的
def配置\u允许的\u参数
设计参数消毒剂。对于（：注册）如果
resource
不是
User
的一个实例，你就有大麻烦了。我刚开始学习Rails，我该如何检查这种情况以及如何修复它？谢谢迁移后是否重新启动了服务器？您正在尝试使用用户名作为身份验证。密钥而不是默认值（电子邮件）？向我们显示模型/视图的内容。那么这是我问题的解决方案吗？如果我这样做，它会工作吗？我完成了整个演练，但它没有工作，当我到达：username时，它给了我相同的错误<代码>未定义的#

方法“username”是否根据您的身份验证密钥更改了设备视图？新手问题，我该怎么做？您必须从应用程序中更改以下视图：design/sessions/new.html.erb、design/registrations/edit.html.erb、design/registrations/new.html.erb。我将根据此编辑我的答案。