# 前提・実現したいこと

Ruby on
railsにてTwitterログインからの退会機能を作成しております。退会ボタンをおすと下記のメッセージが表示されてしまうのですが、対処方法をご教示頂けませんでしょうか？  
何卒よろしくお願い致します。

# 発生している問題・エラーメッセージ

```

    Routing Error 
    undefined method ` before_action' for UsersController:Class
    
    Rails.root: /Users/TOMOAKI/photolog
    
    Application Trace | Framework Trace | Full Trace app/controllers/users_controller.rb:2:in <class:UsersController>' 
    
    app/controllers/users_controller.rb:1:in <top (required)>' Routes
    
    Routes match in priority from top to bottom
    
    Helper    HTTP Verb    Path    Controller#Action Path / Url       Path Match
    
    comments_path    GET    /comments(.:format)    comments#index 
                    POST    /comments(.:format)    comments#create 
    new_comment_path    GET    /comments/new(.:format)    comments#new 
    edit_comment_path    GET    /comments/:id/edit(.:format)    comments#edit 
    comment_path    GET    /comments/:id(.:format)    comments#show 
                    PATCH    /comments/:id(.:format)    comments#update 
                    PUT    /comments/:id(.:format)    comments#update 
                    DELETE    /comments/:id(.:format)    comments#destroy 
    new_user_session_path    GET    /users/sign_in(.:format)    devise/sessions#new 
    user_session_path    POST    /users/sign_in(.:format)    devise/sessions#create 
    destroy_user_session_path    DELETE    /users/sign_out(.:format)    devise/sessions#destroy 
    user_omniauth_authorize_path    GET|
                    POST    /users/auth/:provider(.:format)    users/omniauth_callbacks#passthru {:provider=>/twitter|facebook/} 
    user_omniauth_callback_path    GET|
                    POST    /users/auth/:action/callback(.:format)    users/omniauth_callbacks#(?-mix:twitter|facebook) 
    user_password_path    POST    /users/password(.:format)    devise/passwords#create 
    new_user_password_path    GET    /users/password/new(.:format)    devise/passwords#new 
    edit_user_password_path    GET    /users/password/edit(.:format)    devise/passwords#edit 
                    PATCH    /users/password(.:format)    devise/passwords#update 
                    PUT    /users/password(.:format)    devise/passwords#update 
    cancel_user_registration_path    GET    /users/cancel(.:format)    devise/registrations#cancel 
    user_registration_path    POST    /users(.:format)    devise/registrations#create 
    new_user_registration_path    GET    /users/sign_up(.:format)    devise/registrations#new 
    edit_user_registration_path    GET    /users/edit(.:format)    devise/registrations#edit 
                    PATCH    /users(.:format)    devise/registrations#update 
                    PUT    /users(.:format)    devise/registrations#update 
                    DELETE    /users(.:format)    devise/registrations#destroy 
    root_path    GET    /    redirect(301, /photos) 
    photos_path    GET    /photos(.:format)    photos#index 
                    POST    /photos(.:format)    photos#create 
    new_photo_path    GET    /photos/new(.:format)    photos#new 
    edit_photo_path    GET    /photos/:id/edit(.:format)    photos#edit 
    photo_path    GET    /photos/:id(.:format)    photos#show 
                    PATCH    /photos/:id(.:format)    photos#update 
                    PUT    /photos/:id(.:format)    photos#update 
                    DELETE    /photos/:id(.:format)    photos#destroy 
    retire_user_path    GET    /user/retire(.:format)    users#retire 
    user_path    POST    /user(.:format)    users#create 
    new_user_path    GET    /user/new(.:format)    users#new 
    edit_user_path    GET    /user/edit(.:format)    users#edit 
                    GET    /user(.:format)    users#show 
                    PATCH    /user(.:format)    users#update 
                    PUT    /user(.:format)    users#update 
                    DELETE    /user(.:format)    users#destroy
    
```

## Request

Parameters:

```

    None Toggle session dump Toggle env dump Response
    
```

Headers:

```

    None
    
```

# コード

app/users/users.contoller.rb:

```

    class UsersController < ApplicationController
     before_action :authenticate
    
      def retire
      end
    
      def destroy
        if current_user.destroy
          reset_session
          redirect_to root_path, notice:'退会完了しました'
        else
          render :retire
        end    
      end
    end
    
```

config/routes.rb:

```

    Rails.application.routes.draw do
      resources :comments
      devise_for :users, controllers: { omniauth_callbacks: 'users/omniauth_callbacks' }
      root to: redirect('/photos')
      resources :photos
      resource :user do
        get 'retire'
      end
    
      # The priority is based upon order of creation: first created -> highest priority.
      # See how all your routes lay out with "rake routes".
    
      # You can have the root of your site routed with "root"
      # root 'welcome#index'
    
      # Example of regular route:
      #   get 'products/:id' => 'catalog#view'
    
      # Example of named route that can be invoked with purchase_url(id: product.id)
      #   get 'products/:id/purchase' => 'catalog#purchase', as: :purchase
    
      # Example resource route (maps HTTP verbs to controller actions automatically):
      #   resources :products
    
      # Example resource route with options:
      #   resources :products do
      #     member do
      #       get 'short'
      #       post 'toggle'
      #     end
      #
      #     collection do
      #       get 'sold'
      #     end
      #   end
    
      # Example resource route with sub-resources:
      #   resources :products do
      #     resources :comments, :sales
      #     resource :seller
      #   end
    
      # Example resource route with more complex sub-resources:
      #   resources :products do
      #     resources :comments
      #     resources :sales do
      #       get 'recent', on: :collection
      #     end
      #   end
    
      # Example resource route with concerns:
      #   concern :toggleable do
      #     post 'toggle'
      #   end
      #   resources :posts, concerns: :toggleable
      #   resources :photos, concerns: :toggleable
    
      # Example resource route within a namespace:
      #   namespace :admin do
      #     # Directs /admin/products/* to Admin::ProductsController
      #     # (app/controllers/admin/products_controller.rb)
      #     resources :products
      #   end
    end
    
```

app/models/user.rb:

```

    class User < ActiveRecord::Base
      # Include default devise modules. Others available are:
      # :confirmable, :lockable, :timeoutable and :omniauthable
      devise :database_authenticatable, :registerable,
             :recoverable, :rememberable, :trackable, :validatable, :omniauthable
             has_many :photos, dependent: :nullify
             has_many :comments, dependent: :nullify
    
    
             def self.find_or_create_from_oauth(auth)
             User.find_or_create_by(provider: auth.provider, uid: auth.uid) do |user|
             user.user_name  = auth.info.nickname || auth.info.name
             user.avatar_url = auth.info.image
             user.email      = User.dummy_email(auth)
             user.password   = Devise.friendly_token[0, 20]
        end
      end
    
      private
    
      def self.dummy_email(auth)
        "#{auth.uid}-#{auth.provider}@example.com"
      end
    
    end
    
```
CC BY-SA 3.0
2016-01-30T03:33:08.750
21498
2016-03-04T14:56:29.563
2016-01-30T04:32:55.863
76
13449
question
ruby-on-rails ruby
undefined method ` before_action' のエラーが出る
before_actionというメソッド名のbの前に全角スペースが入っていて`空白before_action`というメソッド名になっているのでNoMethodErrorが発生します。  
全角の文字は基本メソッド名に使えますので上記のようなエラーが出るかと思います。  
Editorの設定で全角スペースは可視化するように設定を変更するとよいと思います。
CC BY-SA 3.0
2016-02-03T11:53:00.283
21670
2016-02-03T11:58:39.720
2016-02-03T11:58:39.720
7373
7373
21498
answer