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### 前提・実現したいこと

※cloud9を開発環境としてつかっています。

現在簡単な投稿のアプリをRailsで作っているのですが、  
すでに投稿されたものを修正する機能を追加しようとしたときに  
編集をすると  
undefined method `update' for nil:NilClass  
というエラーが出てしまい、編集が完了できません。

### 発生している問題・エラーメッセージ

[![画像の説明をここに入力](https://i.stack.imgur.com/GmNP8.png)](https://i.stack.imgur.com/GmNP8.png)

```

    undefined method `update' for nil:NilClass
    
```

追記：  
id:12のデータを投稿後に編集するようにしたいので  
コメントいただいたようにデータが入っていないのかな？と見たところ

```

    2.6.0 :004 > Article.find(12)
      Article Load (0.2ms)  SELECT  "articles".* FROM "articles" WHERE "articles"."id" = ? LIMIT ?  [["id", 12], ["LIMIT", 1]]
     => #<Article id: 12, title: "testing article", description: "this is a test", created_at: "2019-06-21 19:13:10", updated_at: "2019-06-21 19:13:10"> 
    2.6.0 :005 > 
    
```

となっており、データ自体は存在するようです。

development.logのエラーが出ているところのログです。

```

    app/controllers/articles_controller.rb:23:in `update'
      [1m[36mArticle Load (0.4ms)[0m  [1m[34mSELECT  "articles".* FROM "articles" LIMIT ?[0m  [["LIMIT", 11]]
      [1m[36mArticle Load (0.2ms)[0m  [1m[34mSELECT  "articles".* FROM "articles" WHERE "articles"."id" = ? LIMIT ?[0m  [["id", 12], ["LIMIT", 1]]
    Started GET "/articles/12/edit" for 39.111.211.9 at 2019-06-22 05:22:48 +0000
    Cannot render console from 39.111.211.9! Allowed networks: 127.0.0.1, ::1, 127.0.0.0/127.255.255.255
      [1m[35m (0.1ms)[0m  [1m[34mSELECT "schema_migrations"."version" FROM "schema_migrations" ORDER BY "schema_migrations"."version" ASC[0m
      ↳ /home/ec2-user/.rvm/gems/ruby-2.6.0/gems/activerecord-5.2.3/lib/active_record/log_subscriber.rb:98
    Processing by ArticlesController#edit as HTML
      Parameters: {"id"=>"12"}
      [1m[36mArticle Load (0.1ms)[0m  [1m[34mSELECT  "articles".* FROM "articles" WHERE "articles"."id" = ? LIMIT ?[0m  [["id", 12], ["LIMIT", 1]]
      ↳ app/controllers/articles_controller.rb:7
      Rendering articles/edit.html.erb within layouts/application
      Rendered articles/edit.html.erb within layouts/application (4.7ms)
    Completed 200 OK in 215ms (Views: 200.8ms | ActiveRecord: 0.7ms)
    
    
    Started PATCH "/articles/12" for 39.111.211.9 at 2019-06-22 05:22:56 +0000
    Cannot render console from 39.111.211.9! Allowed networks: 127.0.0.1, ::1, 127.0.0.0/127.255.255.255
    Processing by ArticlesController#update as HTML
      Parameters: {"utf8"=>"✓", "authenticity_token"=>"RvxoB0HoLqxeKxzzVF0q3RnSwQ2Gt6NQGXQ2v3JArvL0SmVMx95vddWBXKBndq0nKbBE7W8lp+M5ryxJIZvWLg==", "article"=>{"title"=>"testing article", "description"=>"this is a test edited"}, "commit"=>"Update Article", "id"=>"12"}
      [1m[36mArticle Load (0.1ms)[0m  [1m[34mSELECT  "articles".* FROM "articles" WHERE "articles"."id" = ? LIMIT ?[0m  [["id", 12], ["LIMIT", 1]]
      ↳ app/controllers/articles_controller.rb:22
    Completed 500 Internal Server Error in 2ms (ActiveRecord: 0.1ms)
    
```

### 該当のソースコード

github:  
<https://github.com/yuks0810/alpha-blog>

```

    class ArticlesController < ApplicationController
      def new 
        @article = Article.new
      end
    
      def edit
        @article = Article.find(params[:id])
      end
    
      def create
        @article = Article.new(article_params)
        if @article.save
          flash[:notice] = "Article was successfully created"
          redirect_to article_path(@article)
        else
          render 'new'
        end
      end
      # create action does not need a template as def new does
    
      def update 
        @artcle = Article.find(params[:id])
        if @article.update(article_params)
            flash[:notice] = "Article was successfully updated"
            redirect_to article_path(@article)
        else
          render "edit"
        end
      end
    
      def show 
        @article = Article.find(params[:id])
      end
    
      private
        def article_params
          params.require(:article).permit(:title, :description)
        end
    
    end
    
    
```

undefined methodとなっていますが、def updateで定義していてタイポでもないと思うので  
なぜエラーが出るのかわかりません。

どなたかわかる方いらっしゃいましたらご教示お願い致します。
CC BY-SA 4.0
2019-06-22T10:10:05.560
56012
2019-06-22T10:13:41.433
34826
question
ruby-on-rails ruby
undefined method `update' for nil:NilClass エラーが出て解決できない
`@artcle`になっています。`@article`に修正しましょう。

```

    @artcle = Article.find(params[:id])
    
```
CC BY-SA 4.0
2019-06-22T10:13:41.433
56013
2019-06-22T10:13:41.433
3271
56012
answer