Rake прервана, ошибка при попытке загрузить Gem «uglifier»

Question

Я подписчик Начало работы с Рубином на Heroku ', но при попытке запустить демонстрационное приложение локально с

$ bundle exec rake db:create db:migrate 

Я получаю

sam@samoliver:~/ruby-getting-started$ bundle exec rake db:create db:migrate --trace 
rake aborted! 
Bundler::GemRequireError: There was an error while trying to load the gem 'uglifier'. 
/home/sam/.rvm/gems/ruby-2.2.3/gems/bundler-1.11.0/lib/bundler/runtime.rb:80:in `rescue in block (2 levels) in require' 
/home/sam/.rvm/gems/ruby-2.2.3/gems/bundler-1.11.0/lib/bundler/runtime.rb:76:in `block (2 levels) in require' 
/home/sam/.rvm/gems/ruby-2.2.3/gems/bundler-1.11.0/lib/bundler/runtime.rb:72:in `each' 
/home/sam/.rvm/gems/ruby-2.2.3/gems/bundler-1.11.0/lib/bundler/runtime.rb:72:in `block in require' 
/home/sam/.rvm/gems/ruby-2.2.3/gems/bundler-1.11.0/lib/bundler/runtime.rb:61:in `each' 
/home/sam/.rvm/gems/ruby-2.2.3/gems/bundler-1.11.0/lib/bundler/runtime.rb:61:in `require' 
/home/sam/.rvm/gems/ruby-2.2.3/gems/bundler-1.11.0/lib/bundler.rb:99:in `require' 
/home/sam/ruby-getting-started/config/application.rb:7:in `<top (required)>' 
/home/sam/ruby-getting-started/Rakefile:4:in `require' 
/home/sam/ruby-getting-started/Rakefile:4:in `<top (required)>' 
/home/sam/.rvm/rubies/ruby-2.2.3/lib/ruby/2.2.0/rake/rake_module.rb:28:in `load' 
/home/sam/.rvm/rubies/ruby-2.2.3/lib/ruby/2.2.0/rake/rake_module.rb:28:in `load_rakefile' 
/home/sam/.rvm/rubies/ruby-2.2.3/lib/ruby/2.2.0/rake/application.rb:689:in `raw_load_rakefile' 
/home/sam/.rvm/rubies/ruby-2.2.3/lib/ruby/2.2.0/rake/application.rb:94:in `block in load_rakefile' 
/home/sam/.rvm/rubies/ruby-2.2.3/lib/ruby/2.2.0/rake/application.rb:176:in `standard_exception_handling' 
/home/sam/.rvm/rubies/ruby-2.2.3/lib/ruby/2.2.0/rake/application.rb:93:in `load_rakefile' 
/home/sam/.rvm/rubies/ruby-2.2.3/lib/ruby/2.2.0/rake/application.rb:77:in `block in run' 
/home/sam/.rvm/rubies/ruby-2.2.3/lib/ruby/2.2.0/rake/application.rb:176:in `standard_exception_handling' 
/home/sam/.rvm/rubies/ruby-2.2.3/lib/ruby/2.2.0/rake/application.rb:75:in `run' 
/home/sam/.rvm/rubies/ruby-2.2.3/bin/rake:33:in `<main>' 
ExecJS::RuntimeUnavailable: Could not find a JavaScript runtime. See https://github.com/sstephenson/execjs for a list of available runtimes. 
/home/sam/.rvm/gems/ruby-2.2.3/gems/execjs-2.2.2/lib/execjs/runtimes.rb:51:in `autodetect' 
/home/sam/.rvm/gems/ruby-2.2.3/gems/execjs-2.2.2/lib/execjs.rb:5:in `<module:ExecJS>' 
/home/sam/.rvm/gems/ruby-2.2.3/gems/execjs-2.2.2/lib/execjs.rb:4:in `<top (required)>' 
/home/sam/.rvm/gems/ruby-2.2.3/gems/uglifier-2.5.3/lib/uglifier.rb:3:in `require' 
/home/sam/.rvm/gems/ruby-2.2.3/gems/uglifier-2.5.3/lib/uglifier.rb:3:in `<top (required)>' 
/home/sam/.rvm/gems/ruby-2.2.3/gems/bundler-1.11.0/lib/bundler/runtime.rb:77:in `require' 
/home/sam/.rvm/gems/ruby-2.2.3/gems/bundler-1.11.0/lib/bundler/runtime.rb:77:in `block (2 levels) in require' 
/home/sam/.rvm/gems/ruby-2.2.3/gems/bundler-1.11.0/lib/bundler/runtime.rb:72:in `each' 
/home/sam/.rvm/gems/ruby-2.2.3/gems/bundler-1.11.0/lib/bundler/runtime.rb:72:in `block in require' 
/home/sam/.rvm/gems/ruby-2.2.3/gems/bundler-1.11.0/lib/bundler/runtime.rb:61:in `each' 
/home/sam/.rvm/gems/ruby-2.2.3/gems/bundler-1.11.0/lib/bundler/runtime.rb:61:in `require' 
/home/sam/.rvm/gems/ruby-2.2.3/gems/bundler-1.11.0/lib/bundler.rb:99:in `require' 
/home/sam/ruby-getting-started/config/application.rb:7:in `<top (required)>' 
/home/sam/ruby-getting-started/Rakefile:4:in `require' 
/home/sam/ruby-getting-started/Rakefile:4:in `<top (required)>' 
/home/sam/.rvm/rubies/ruby-2.2.3/lib/ruby/2.2.0/rake/rake_module.rb:28:in `load' 
/home/sam/.rvm/rubies/ruby-2.2.3/lib/ruby/2.2.0/rake/rake_module.rb:28:in `load_rakefile' 
/home/sam/.rvm/rubies/ruby-2.2.3/lib/ruby/2.2.0/rake/application.rb:689:in `raw_load_rakefile' 
/home/sam/.rvm/rubies/ruby-2.2.3/lib/ruby/2.2.0/rake/application.rb:94:in `block in load_rakefile' 
/home/sam/.rvm/rubies/ruby-2.2.3/lib/ruby/2.2.0/rake/application.rb:176:in `standard_exception_handling' 
/home/sam/.rvm/rubies/ruby-2.2.3/lib/ruby/2.2.0/rake/application.rb:93:in `load_rakefile' 
/home/sam/.rvm/rubies/ruby-2.2.3/lib/ruby/2.2.0/rake/application.rb:77:in `block in run' 
/home/sam/.rvm/rubies/ruby-2.2.3/lib/ruby/2.2.0/rake/application.rb:176:in `standard_exception_handling' 
/home/sam/.rvm/rubies/ruby-2.2.3/lib/ruby/2.2.0/rake/application.rb:75:in `run' 
/home/sam/.rvm/rubies/ruby-2.2.3/bin/rake:33:in `<main>' 
sam@samoliver:~/ruby-getting-started$ 

Я попытался удалить и снова добавить «uglifier» (2.5.3), и у меня установлен «therubyracer», поэтому я не понимаю, о чем жалуется ExecJS.

Gemfile

source 'https://rubygems.org' 
ruby '2.2.3' 

# Bundle edge Rails instead: gem 'rails', github: 'rails/rails' 
gem 'rails', '4.2.3' 
# Use postgresql as the database for Active Record 
gem 'pg' 
gem 'rails_12factor', group: :production 
# Use SCSS for stylesheets 
gem 'sass-rails', '~> 5.0.3' 
# Use Uglifier as compressor for JavaScript assets 
gem 'uglifier', '>= 1.3.0' 
# Use CoffeeScript for .js.coffee assets and views 
gem 'coffee-rails', '~> 4.0.0' 
# See https://github.com/sstephenson/execjs#readme for more supported runtimes 
# gem 'therubyracer', platforms: :ruby 

# Use jquery as the JavaScript library 
gem 'jquery-rails' 
# Turbolinks makes following links in your web application faster. Read more: https://github.com/rails/turbolinks 
gem 'turbolinks' 
# Build JSON APIs with ease. Read more: https://github.com/rails/jbuilder 
gem 'jbuilder', '~> 2.0' 
# bundle exec rake doc:rails generates the API under doc/api. 
gem 'sdoc', '~> 0.4.0',   group: :doc 

# Spring speeds up development by keeping your application running in the background. Read more: https://github.com/rails/spring 
gem 'spring',  group: :development 

# Use ActiveModel has_secure_password 
# gem 'bcrypt', '~> 3.1.7' 

gem 'puma' 

# Use Capistrano for deployment 
# gem 'capistrano-rails', group: :development 

# Use debugger 
# gem 'debugger', group: [:development, :test] 

Answer 1

установить nodejs

apt-get install nodejs 

Answer 2

раскомментируйте строку ниже в Gemfile

#gem 'therubyracer', platforms: :ruby 

перспективе в терминале

bundle install 

Answer 3

Uglifier является JavaScript компрессор, поэтому нужно время выполнения Java-попробуйте установить nodejs

Выполнить это установить NodeJS в Ubuntu

sudo apt-get install nodejs 

или

brew install nodejs 

если вы на OSX.

Answer 4

У меня была такая же проблема. Я должен был пойти в мою корневую папку (на убунту использовать

sudo su) 

Оттуда использовать apt-get install nodejs, а затем выйти из корня и запустить bundle install, то вы должны быть в состоянии запустить rake db:migrate

Answer 5

Попробуйте это:

gem update --system 1.4.2