设计中未定义的局部变量或方法`resource_class’

我正在尝试添加一个名为username的属性来设计但rails在以下代码行中显示错误我正在使用rails 4.0.0并设计3 

def configure_permitted_parameters devise_parameter_sanitizer.for(:sign_up) { |u| u.permit(:username, :email, :password, :password_confirmation) } end

控制器应用 

 class ApplicationController < ActionController::Base # Prevent CSRF attacks by raising an exception. # For APIs, you may want to use :null_session instead. protect_from_forgery with: :exception before_action :configure_permitted_parameters if :devise_controller? protected def configure_permitted_parameters devise_parameter_sanitizer.for(:sign_up) { |u| u.permit(:username, :email, :password, :password_confirmation) } end end

尝试： 

 before_action :configure_permitted_parameters, if: :devise_controller?

要么 

 before_action :configure_permitted_parameters, :if => :devise_controller?

参考： https ： //github.com/plataformatec/devise/issues/2372&http ： //guides.rubyonrails.org/active_record_callbacks.html#conditional-callbacks

您错误输入逗号之前，如果： 

 before_action :configure_permitted_parameters, if: :devise_controller?

我在这里遇到同样的问题。 问题是代码已经设置好了你的答案。 出了什么问题？ 我应该去别处吗？ 

 class ApplicationController < ActionController::Base protect_from_forgery with: :exception before_action :set_locale before_action :set_instances before_action :configure_permitted_parameters, if: :devise_controller? before_action :mixpanel def set_locale I18n.locale = params[:locale] || I18n.default_locale end def redirect_to_back begin redirect_to :back rescue ActionController::RedirectBackError => e redirect_to root_path end end def set_instances @new_event ||= Event.new(title: ".......", capacity: 50, start_date: Time.zone.now, start_time: Time.zone.now, end_time: Time.zone.now) @featured_quizz ||= Questionnaire.where('featured IS TRUE') end helper_method :resource_name, :resource, :devise_mapping protected def resource_name :user end def resource @resource ||= User.new end def devise_mapping @devise_mapping ||= Devise.mappings[:user] end def configure_permitted_parameters devise_parameter_sanitizer.for(:sign_up) << [:name, :firstname, :lastname, :phone] devise_parameter_sanitizer.for(:account_update) << [:name, :firstname, :lastname, :image, :phone] end end

并且它显示错误_links.html.slim

未定义的局部变量或方法`resource_class'用于＃<＃：0x007f82f02c8218> 

 .row.text-center .col-md-10.col-md-offset-1 - if devise_mapping.omniauthable? - resource_class.omniauth_providers.each do |provider| = link_to omniauth_authorize_path(resource_name, provider), class:"btn btn-fb btn-block callout callout-fb" span.fa.fa-facebook-official<> span Connectez vous avec #{provider.to_s.titleize}

这是前面的语法错误吗？ 

  li = link_to "Votre Compte", resource, as: resource_name, url: session_path(resource_name), remote: true, data: { toggle: "modal", target: "#login-modal" }
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