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NoMethodError: undefined method `name' for nil:NilClass と出たら... パーフェクト Ruby on Rails

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パーフェクト Ruby on Rails p.54の操作中「NoMethodError: undefined method `name' for nil:NilClass」のエラーが出たら...

Railsのバージョンを指定の4.1.1から、4.1.2にバージョンアップさせましょう。

Gemfile
gem 'rails', '4.1.2'
# railsのバージョンを書き換え
Terminal
bundle update rails
# railsのバージョンを書き換えをGemfile.lockに反映 
Terminal
bundle install

エラーが出るのは、Railsのバグが原因だそうです。

参考:one by one 「NoMethodError: undefined method `name' for nil:NilClass」

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