ruby on Rails：未定义的方法“version_requirements”新安装后尝试启动服务器时

Question

我最近不得不在 Rails 上新安装 ruby​​。当我尝试启动一个项目的服务器时，我在这个新安装之前就已经在处理这个项目了，我收到了以下错误：

$ ruby script/server
=> Booting WEBrick...
./script/../config/../vendor/rails/railties/lib/rails/gem_dependency.rb:107:in `requirement': undefined method `version_requirements' for #<Gem::Dependency:0xb74bf764> (NoMethodError)
    from ./script/../config/../vendor/rails/railties/lib/initializer.rb:292:in `check_gem_dependencies'
    from ./script/../config/../vendor/rails/railties/lib/initializer.rb:292:in `map'
    from ./script/../config/../vendor/rails/railties/lib/initializer.rb:292:in `check_gem_dependencies'
    from ./script/../config/../vendor/rails/railties/lib/initializer.rb:165:in `process'
from ./script/../config/../vendor/rails/railties/lib/initializer.rb:112:in `send'
    from ./script/../config/../vendor/rails/railties/lib/initializer.rb:112:in `run'
    from /media/78C0-455B/bidmc/schedule/config/environment.rb:13
    from /usr/local/lib/site_ruby/1.8/rubygems/custom_require.rb:36:in `gem_original_require'
    from /usr/local/lib/site_ruby/1.8/rubygems/custom_require.rb:36:in `require'
    from /media/78C0-455B/bidmc/schedule/vendor/rails/activesupport/lib/active_support/dependencies.rb:153:in `require'
    from /media/78C0-455B/bidmc/schedule/vendor/rails/activesupport/lib/active_support/dependencies.rb:521:in `new_constants_in'
    from /media/78C0-455B/bidmc/schedule/vendor/rails/activesupport/lib/active_support/dependencies.rb:153:in `require'
    from /media/78C0-455B/bidmc/schedule/vendor/rails/railties/lib/commands/servers/webrick.rb:59
    from /usr/local/lib/site_ruby/1.8/rubygems/custom_require.rb:36:in `gem_original_require'
    from /usr/local/lib/site_ruby/1.8/rubygems/custom_require.rb:36:in `require'
    from /media/78C0-455B/bidmc/schedule/vendor/rails/activesupport/lib/active_support/dependencies.rb:153:in `require'
    from /media/78C0-455B/bidmc/schedule/vendor/rails/activesupport/lib/active_support/dependencies.rb:521:in `new_constants_in'
    from /media/78C0-455B/bidmc/schedule/vendor/rails/activesupport/lib/active_support/dependencies.rb:153:in `require'
    from /media/78C0-455B/bidmc/schedule/vendor/rails/railties/lib/commands/server.rb:49
    from /usr/local/lib/site_ruby/1.8/rubygems/custom_require.rb:36:in `gem_original_require'
    from /usr/local/lib/site_ruby/1.8/rubygems/custom_require.rb:36:in `require'
    from script/server:3

我有最新版本的 ruby​​、rubygems 和rails。

有什么建议吗？

谢谢。

Answer 1

看起来您正在使用较新版本的 ruby​​gems 和较旧版本的 Rails。

这是一个解决方案：https://gist.github.com/807008