相关疑难解决方法(0)

在Rails 3中,专门用于在资产管道中生成资产的gem被正确放置在assetsGemfile 的组中:

...

# Gems used only for assets and not required
# in production environments by default.
group :assets do
  gem 'sass-rails'
  gem 'coffee-rails'
  gem 'uglifier'

  # See https://github.com/sstephenson/execjs#readme for more supported runtimes
  # gem 'therubyracer', :platforms => :ruby
end

现在,根据(仍在进行中)升级文档:

Rails 4.0从Gemfile中删除了资产组.升级时,您需要从Gemfile中删除该行.

果然,使用RC1创建一个新项目会生成一个Gemfile,其默认包含在任何组之外的资产相关gem:

source 'https://rubygems.org'

# Bundle edge Rails instead: gem 'rails', github: 'rails/rails'
gem 'rails', '4.0.0.rc1'

# Use sqlite3 as the database for Active Record
gem 'sqlite3'

# Use SCSS for stylesheets …