uninitialized constant CarrierWave (NameError）について

Question

###前提・実現したいこと
CarrierWaveのgemをinstallしたアプリケーションを作成し、
herokuにデプロイしたいです。
ローカルでは、正常に動作しています。

###発生している問題・エラーメッセージ

エラーメッセージ

◆怪しいエラー抜粋
2018-01-06T08:49:06.822852+00:00 app[web.1]: /app/app/uploaders/image_uploader.rb:1:in `<top (required)>’: uninitialized constant CarrierWave (NameError)

◆heroku logs -t で確認したエラー全部

Running rails c on ⬢ mighty-chamber-27044... up, run.1965 (Free)
/app/app/uploaders/image_uploader.rb:1:in `<top (required)>': uninitialized constant CarrierWave (NameError)
        from /app/vendor/bundle/ruby/2.3.0/gems/activesupport-5.1.4/lib/active_support/dependencies/interlock.rb:12:in `block in loading'
        from /app/vendor/bundle/ruby/2.3.0/gems/activesupport-5.1.4/lib/active_support/concurrency/share_lock.rb:149:in `exclusive'
        from /app/vendor/bundle/ruby/2.3.0/gems/activesupport-5.1.4/lib/active_support/dependencies/interlock.rb:11:in `loading'
        from /app/app/models/feed.rb:2:in `<class:Feed>'
        from /app/app/models/feed.rb:1:in `<top (required)>'
        from /app/vendor/bundle/ruby/2.3.0/gems/activesupport-5.1.4/lib/active_support/dependencies/interlock.rb:12:in `block in loading'
        from /app/vendor/bundle/ruby/2.3.0/gems/activesupport-5.1.4/lib/active_support/concurrency/share_lock.rb:149:in `exclusive'
        from /app/vendor/bundle/ruby/2.3.0/gems/activesupport-5.1.4/lib/active_support/dependencies/interlock.rb:11:in `loading'
        from /app/vendor/bundle/ruby/2.3.0/gems/railties-5.1.4/lib/rails/engine.rb:476:in `block (2 levels) in eager_load!'
        from /app/vendor/bundle/ruby/2.3.0/gems/railties-5.1.4/lib/rails/engine.rb:475:in `each'
        from /app/vendor/bundle/ruby/2.3.0/gems/railties-5.1.4/lib/rails/engine.rb:475:in `block in eager_load!'
        from /app/vendor/bundle/ruby/2.3.0/gems/railties-5.1.4/lib/rails/engine.rb:473:in `each'
        from /app/vendor/bundle/ruby/2.3.0/gems/railties-5.1.4/lib/rails/engine.rb:473:in `eager_load!'
        from /app/vendor/bundle/ruby/2.3.0/gems/railties-5.1.4/lib/rails/engine.rb:354:in `eager_load!'
        from /app/vendor/bundle/ruby/2.3.0/gems/railties-5.1.4/lib/rails/application/finisher.rb:67:in `each'
        from /app/vendor/bundle/ruby/2.3.0/gems/railties-5.1.4/lib/rails/application/finisher.rb:67:in `block in <module:Finisher>'
        from /app/vendor/bundle/ruby/2.3.0/gems/railties-5.1.4/lib/rails/initializable.rb:30:in `instance_exec'
        from /app/vendor/bundle/ruby/2.3.0/gems/railties-5.1.4/lib/rails/initializable.rb:30:in `run'
        from /app/vendor/bundle/ruby/2.3.0/gems/railties-5.1.4/lib/rails/initializable.rb:59:in `block in run_initializers'
        from /app/vendor/ruby-2.3.4/lib/ruby/2.3.0/tsort.rb:228:in `block in tsort_each'
        from /app/vendor/ruby-2.3.4/lib/ruby/2.3.0/tsort.rb:350:in `block (2 levels) in each_strongly_connected_component'
        from /app/vendor/ruby-2.3.4/lib/ruby/2.3.0/tsort.rb:431:in `each_strongly_connected_component_from'
        from /app/vendor/ruby-2.3.4/lib/ruby/2.3.0/tsort.rb:349:in `block in each_strongly_connected_component'
        from /app/vendor/ruby-2.3.4/lib/ruby/2.3.0/tsort.rb:347:in `each'
        from /app/vendor/ruby-2.3.4/lib/ruby/2.3.0/tsort.rb:347:in `call'
        from /app/vendor/ruby-2.3.4/lib/ruby/2.3.0/tsort.rb:347:in `each_strongly_connected_component'
        from /app/vendor/ruby-2.3.4/lib/ruby/2.3.0/tsort.rb:226:in `tsort_each'
        from /app/vendor/ruby-2.3.4/lib/ruby/2.3.0/tsort.rb:205:in `tsort_each'
        from /app/vendor/bundle/ruby/2.3.0/gems/railties-5.1.4/lib/rails/initializable.rb:58:in `run_initializers'
        from /app/vendor/bundle/ruby/2.3.0/gems/railties-5.1.4/lib/rails/application.rb:353:in `initialize!'
        from /app/config/environment.rb:5:in `<top (required)>'
        from /app/vendor/bundle/ruby/2.3.0/gems/railties-5.1.4/lib/rails/application.rb:329:in `require'
        from /app/vendor/bundle/ruby/2.3.0/gems/railties-5.1.4/lib/rails/application.rb:329:in `require_environment!'
        from /app/vendor/bundle/ruby/2.3.0/gems/railties-5.1.4/lib/rails/command/actions.rb:16:in `require_application_and_environment!'
        from /app/vendor/bundle/ruby/2.3.0/gems/railties-5.1.4/lib/rails/commands/console/console_command.rb:96:in `perform'
        from /app/vendor/bundle/ruby/2.3.0/gems/thor-0.20.0/lib/thor/command.rb:27:in `run'
        from /app/vendor/bundle/ruby/2.3.0/gems/thor-0.20.0/lib/thor/invocation.rb:126:in `invoke_command'
        from /app/vendor/bundle/ruby/2.3.0/gems/thor-0.20.0/lib/thor.rb:387:in `dispatch'
        from /app/vendor/bundle/ruby/2.3.0/gems/railties-5.1.4/lib/rails/command/base.rb:63:in `perform'
        from /app/vendor/bundle/ruby/2.3.0/gems/railties-5.1.4/lib/rails/command.rb:44:in `invoke'
        from /app/vendor/bundle/ruby/2.3.0/gems/railties-5.1.4/lib/rails/commands.rb:16:in `<top (required)>'
        from /app/bin/rails:9:in `require'
        from /app/bin/rails:9:in `<main>'

###該当のソースコード
Ruby on Rails

Gemfile

group :development do
gem 'web-console', '>= 3.3.0'
gem 'listen', '>= 3.0.5', '< 3.2'
gem 'spring'
gem 'spring-watcher-listen', '> 2.0.0'
gem 'bcrypt', '3.1.11'
gem 'better_errors'
gem 'binding_of_caller'
gem 'carrierwave', '> 1.0'
gem 'mini_magick'
gem 'letter_opener_web'
gem 'letter_opener', group: :development
end

###補足情報(言語/FW/ツール等のバージョンなど)
cloud9で作っています。

Answer 1

group :development do ... end の中にあるgemは、heroku上では無視されてしまいます。

group :development は、Railsは、RAILS_ENV=development の時（つまり、開発環境の時）にそこで定義されているgemを読み込みます。
Heroku上だと、RAILS_ENV=production としてrailsが起動されるため、carrierwave は読み込まれていません。

ですので、開発中にのみ使うgemはgroup :developmentを付け、アプリケーションの機能として利用するような全ての環境で使うものは、groupは付けません。

kattyan53さんの利用しているgemの中で、どれが開発用途なのかがわからないのですが、少なくともcarrierwaveを使えるようにするためには、以下のようにすると直ると思います。

gem 'carrierwave', '~> 1.0'
gem 'mini_magick'

group :development do
  gem 'web-console', '>= 3.3.0'
  gem 'listen', '>= 3.0.5', '< 3.2'
  gem 'spring'
  gem 'spring-watcher-listen', '~> 2.0.0'
  gem 'bcrypt', '3.1.11'
  gem 'better_errors'
  gem 'binding_of_caller'
  gem 'letter_opener_web'
  gem 'letter_opener', group: :development
end

Comments

[退会済みユーザー]

ありがとうございました！解決しました！