小编ama*_*man的帖子

好吧,我正在尝试运行"rails console"命令,但这是我得到的:

/home/user/.rvm/rubies/ruby-1.8.7-p352/lib/ruby/1.8/irb/completion.rb:10:in `require': no such file to load -- readline (LoadError)
    from /home/user/.rvm/rubies/ruby-1.8.7-p352/lib/ruby/1.8/irb/completion.rb:10
    from /home/user/.rvm/gems/ruby-1.8.7-p352/gems/railties-3.1.0/lib/rails/commands/console.rb:3:in `require'
    from /home/user/.rvm/gems/ruby-1.8.7-p352/gems/railties-3.1.0/lib/rails/commands/console.rb:3
    from /home/user/.rvm/gems/ruby-1.8.7-p352/gems/railties-3.1.0/lib/rails/commands.rb:37:in `require'
    from /home/user/.rvm/gems/ruby-1.8.7-p352/gems/railties-3.1.0/lib/rails/commands.rb:37
    from script/rails:6:in `require'
    from script/rails:6

如何安装"readline"并使其正常工作？

好的,每当我运行"捆绑安装",我得到这个

Bundler could not find compatible versions for gem "railties":
  In Gemfile:
    sass-rails (~> 3.1.0.rc8) depends on
      railties (~> 3.1.0)

    railties (3.1.0.rc8)

现在在我的宝石文件中我有这个:

source 'http://rubygems.org'

gem 'rails', '3.1.0.rc8'

# Bundle edge Rails instead:
# gem 'rails',     :git => 'git://github.com/rails/rails.git'

gem 'sqlite3'

gem 'json'

# Gems used only for assets and not required
# in production environments by default.
group :assets do
  gem 'sass-rails', "  ~> 3.1.0.rc8"
#added by me
  gem 'railties', " ~> 3.1.0.rc8"
#end
  gem 'coffee-rails', "~> 3.1.0.rc"
  gem …

如果我一直在想,这些讲义从入门C++当然是好材料,我学习语言.

这些材料中是否包含任何严重的事实错误？我会以错误的方式学习一些概念吗？我会从中得到任何不良做法吗？