Rails 4ではGemfileに下記を追加:
Gemfile
gem 'quiet_assets', group: :development
Rails 5では設定を1行追加する:
config/environments/development.rb
config.assets.quiet = true
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Rails 4ではGemfileに下記を追加:
gem 'quiet_assets', group: :development
Rails 5では設定を1行追加する:
config.assets.quiet = true
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