Rails 4和Ruby 1.9错误生成mongoid：config

Question

我正在尝试在Rails应用程序上创建一个可以在Openshift上托管的ruby，但是当我尝试通过终端使用rails g mongoid：config命令时遇到以下错误。 我已经尝试了在stackoverflow上发现的所有内容，但错误仍然存​​在！ 我究竟做错了什么？

这是错误：

/home/themis/.rvm/gems/ruby-2.3.0/gems/activesupport-4.0.3/lib/active_support/values/time_zone.rb:282: warning: circular argument reference - now
/home/themis/rails4/config/application.rb:6:in `require': cannot load such file -- active_job/railtie (LoadError)
    from /home/themis/rails4/config/application.rb:6:in `<top (required)>'
    from /home/themis/.rvm/gems/ruby-2.3.0/gems/spring-1.7.2/lib/spring/application.rb:82:in `require'
    from /home/themis/.rvm/gems/ruby-2.3.0/gems/spring-1.7.2/lib/spring/application.rb:82:in `preload'
    from /home/themis/.rvm/gems/ruby-2.3.0/gems/spring-1.7.2/lib/spring/application.rb:143:in `serve'
    from /home/themis/.rvm/gems/ruby-2.3.0/gems/spring-1.7.2/lib/spring/application.rb:131:in `block in run'
    from /home/themis/.rvm/gems/ruby-2.3.0/gems/spring-1.7.2/lib/spring/application.rb:125:in `loop'
    from /home/themis/.rvm/gems/ruby-2.3.0/gems/spring-1.7.2/lib/spring/application.rb:125:in `run'
    from /home/themis/.rvm/gems/ruby-2.3.0/gems/spring-1.7.2/lib/spring/application/boot.rb:19:in `<top (required)>'
    from /home/themis/.rvm/rubies/ruby-2.3.0/lib/ruby/site_ruby/2.3.0/rubygems/core_ext/kernel_require.rb:55:in `require'
    from /home/themis/.rvm/rubies/ruby-2.3.0/lib/ruby/site_ruby/2.3.0/rubygems/core_ext/kernel_require.rb:55:in `require'
    from -e:1:in `<main>'

和我的Gemfile

source 'https://rubygems.org'
# Bundle edge Rails instead: gem 'rails', github: 'rails/rails'
gem 'rails', '4.0.3'
gem 'mongoid', git: 'https://github.com/mongoid/mongoid.git'
gem 'twitter-bootstrap-rails'  
gem 'less-rails' 
# Use Puma as the app server
gem 'puma', '~> 3.0'
# Use SCSS for stylesheets
gem 'sass-rails', '~> 4.0.0'
# Use Uglifier as compressor for JavaScript assets
gem 'uglifier', '>= 1.3.0'
# Use CoffeeScript for .coffee assets and views
gem 'coffee-rails', '~> 4.2'
# See https://github.com/rails/execjs#readme for more supported runtimes
gem 'therubyracer', platforms: :ruby

# Use jquery as the JavaScript library
gem 'jquery-rails'
# Turbolinks makes navigating your web application faster. Read more: https://github.com/turbolinks/turbolinks
gem 'turbolinks', '~> 5'
# Build JSON APIs with ease. Read more: https://github.com/rails/jbuilder
gem 'jbuilder', '~> 2.5'
gem "rspec"
# Use Redis adapter to run Action Cable in production
# gem 'redis', '~> 3.0'
# Use ActiveModel has_secure_password
# gem 'bcrypt', '~> 3.1.7'

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

group :development, :test do
  # Call 'byebug' anywhere in the code to stop execution and get a debugger console
  gem 'byebug', platform: :mri
end

group :development do
  # Access an IRB console on exception pages or by using <%= console %> anywhere in the code.
  gem 'web-console'
  gem 'listen', '~> 3.0.5'
  # Spring speeds up development by keeping your application running in the background. Read more: https://github.com/rails/spring
  gem 'spring'
  gem 'spring-watcher-listen', '~> 2.0.0'
end

# Windows does not include zoneinfo files, so bundle the tzinfo-data gem
gem 'tzinfo-data', platforms: [:mingw, :mswin, :x64_mingw, :jruby]

Answer 1

这是一个ActiveSupport错误（因此是Rails错误）。

在activesupport-4.0.3/lib/active_support/values/time_zone.rb第282行是

def parse(str, now=now)
  # ...
end

相同文件的第308行是

def now
  # ...
end

问题在于默认参数now=now ，红宝石难以理解后者now是方法调用还是仅仅是局部变量（参数本身）。

如果将now=now修改为now=now() ，那么一切都很好。

此错误已在Rails 4.0.6中修复。