railsのコントローラーをつくりたい

Question

前提・実現したいこと

railsでコントローラーを作成しようとしたら、以下のようなエラーメッセージが出てきました。
解決法を教えて下さい。

よろしくお願いいたします。

発生している問題・エラーメッセージ

[vagrant@localhost flowershare]$ rails g controller Users
/home/vagrant/engineers/flowershare/config/routes.rb:2:in `block in <main>': undefined method `devise_for' for #<ActionDispatch::Routing::Mapper:0x00000000022170d0> (NoMethodError)
	from /home/vagrant/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/actionpack-6.1.3/lib/action_dispatch/routing/route_set.rb:427:in `instance_exec'
	from /home/vagrant/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/actionpack-6.1.3/lib/action_dispatch/routing/route_set.rb:427:in `eval_block'
	from /home/vagrant/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/actionpack-6.1.3/lib/action_dispatch/routing/route_set.rb:409:in `draw'
	from /home/vagrant/engineers/flowershare/config/routes.rb:1:in `<main>'
	from /home/vagrant/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/bootsnap-1.7.2/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:59:in `load'
	from /home/vagrant/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/bootsnap-1.7.2/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:59:in `load'
	from /home/vagrant/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/railties-6.1.3/lib/rails/application/routes_reloader.rb:47:in `block in load_paths'
	from /home/vagrant/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/railties-6.1.3/lib/rails/application/routes_reloader.rb:47:in `each'
	from /home/vagrant/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/railties-6.1.3/lib/rails/application/routes_reloader.rb:47:in `load_paths'
	from /home/vagrant/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/railties-6.1.3/lib/rails/application/routes_reloader.rb:21:in `reload!'
	from /home/vagrant/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/railties-6.1.3/lib/rails/application/routes_reloader.rb:35:in `block in updater'
	from /home/vagrant/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activesupport-6.1.3/lib/active_support/file_update_checker.rb:83:in `execute'
	from /home/vagrant/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/railties-6.1.3/lib/rails/application/routes_reloader.rb:10:in `execute'
	from /home/vagrant/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/railties-6.1.3/lib/rails/application/finisher.rb:195:in `block in <module:Finisher>'
	from /home/vagrant/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/railties-6.1.3/lib/rails/initializable.rb:32:in `instance_exec'
	from /home/vagrant/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/railties-6.1.3/lib/rails/initializable.rb:32:in `run'
	from /home/vagrant/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/railties-6.1.3/lib/rails/initializable.rb:61:in `block in run_initializers'
	from /home/vagrant/.rbenv/versions/2.7.1/lib/ruby/2.7.0/tsort.rb:228:in `block in tsort_each'
	from /home/vagrant/.rbenv/versions/2.7.1/lib/ruby/2.7.0/tsort.rb:350:in `block (2 levels) in each_strongly_connected_component'
	from /home/vagrant/.rbenv/versions/2.7.1/lib/ruby/2.7.0/tsort.rb:431:in `each_strongly_connected_component_from'
	from /home/vagrant/.rbenv/versions/2.7.1/lib/ruby/2.7.0/tsort.rb:349:in `block in each_strongly_connected_component'
	from /home/vagrant/.rbenv/versions/2.7.1/lib/ruby/2.7.0/tsort.rb:347:in `each'
	from /home/vagrant/.rbenv/versions/2.7.1/lib/ruby/2.7.0/tsort.rb:347:in `call'
	from /home/vagrant/.rbenv/versions/2.7.1/lib/ruby/2.7.0/tsort.rb:347:in `each_strongly_connected_component'
	from /home/vagrant/.rbenv/versions/2.7.1/lib/ruby/2.7.0/tsort.rb:226:in `tsort_each'
	from /home/vagrant/.rbenv/versions/2.7.1/lib/ruby/2.7.0/tsort.rb:205:in `tsort_each'
	from /home/vagrant/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/railties-6.1.3/lib/rails/initializable.rb:60:in `run_initializers'
	from /home/vagrant/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/railties-6.1.3/lib/rails/application.rb:384:in `initialize!'
	from /home/vagrant/engineers/flowershare/config/environment.rb:5:in `<main>'
	from /home/vagrant/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/bootsnap-1.7.2/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:23:in `require'
	from /home/vagrant/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/bootsnap-1.7.2/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:23:in `block in require_with_bootsnap_lfi'
	from /home/vagrant/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/bootsnap-1.7.2/lib/bootsnap/load_path_cache/loaded_features_index.rb:92:in `register'
	from /home/vagrant/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/bootsnap-1.7.2/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:22:in `require_with_bootsnap_lfi'
	from /home/vagrant/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/bootsnap-1.7.2/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:31:in `require'
	from /home/vagrant/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/zeitwerk-2.4.2/lib/zeitwerk/kernel.rb:34:in `require'
	from /home/vagrant/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activesupport-6.1.3/lib/active_support/dependencies.rb:332:in `block in require'
	from /home/vagrant/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activesupport-6.1.3/lib/active_support/dependencies.rb:299:in `load_dependency'
	from /home/vagrant/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activesupport-6.1.3/lib/active_support/dependencies.rb:332:in `require'
	from /home/vagrant/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/spring-2.1.1/lib/spring/application.rb:106:in `preload'
	from /home/vagrant/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/spring-2.1.1/lib/spring/application.rb:157:in `serve'
	from /home/vagrant/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/spring-2.1.1/lib/spring/application.rb:145:in `block in run'
	from /home/vagrant/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/spring-2.1.1/lib/spring/application.rb:139:in `loop'
	from /home/vagrant/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/spring-2.1.1/lib/spring/application.rb:139:in `run'
	from /home/vagrant/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/spring-2.1.1/lib/spring/application/boot.rb:19:in `<top (required)>'
	from /home/vagrant/.rbenv/versions/2.7.1/lib/ruby/2.7.0/rubygems/core_ext/kernel_require.rb:72:in `require'
	from /home/vagrant/.rbenv/versions/2.7.1/lib/ruby/2.7.0/rubygems/core_ext/kernel_require.rb:72:in `require'
	from -e:1:in `<main>'

###問題が発生するまでの流れ・手順

1. アプリを作るディレクトリを作成
2. rails new で新規作成
3. 必要なGemをGemfileに追記
4. Gemを追記したらbundle install
5. データベース作成
6. モデルを作成
7. migrationファイルにテーブル設定を書く
8. modelにアソシエーションを書く
9. ルーティングを設定

補足情報（FW/ツールのバージョンなど）

Rails 6.1.3
ruby 2.7.1
Vagrant 2.2.14
centos7

Comments

[m.ts10806]

そこにいたるまでどのような手順を踏んだのでしょう。
現状だと「エラーの通り」くらいしか言えませんが

[退会済みユーザー]

赤い文字に書いてあるファイル内のコードを、どうしたら良いのかわからず質問しました。
書き換えるのでしょか。

[m.ts10806]

いえ、ですから、そこにいたるまでどのような手順を踏んだのでしょう。質問本文に記載してください。
Gemfileの内容も場合によっては必要そうなのですけど、現時点では回答のためのヒントがエラーしかないので「エラーの通りしか言えない」と書いています。

[退会済みユーザー]

意味がわからず、申し訳ありませんでした。
問題が発生するまでの流れ・手順を追記しました。

[m.ts10806]

ん－となると
それぞれ、自身が書いたコードも提示いただいたほうが良いですね。
ただ、結局エラーの通りのように思いますが。
エラーメッセージで検索するとこういう記事もあるし。
https://note.com/oreno/n/n1e32cefe430b

[退会済みユーザー]

１回gem deviceの初期化を試してみたいと思います。
ありがとうございました。

Answer 1

config/routes.rb:2:　にて undefined method devise_for' `
ということは
gem Devise を取り込んでいない、もしくはその初期化をしていないのに、
devise前提のroutes.rbを書いた（かコピった）ようです。

Comments

[退会済みユーザー]

gem deviseの初期化を行っていませんでした。
初期化をしてみます。
ありがとうございました。