我是编程（以前只做html / css / design）的新手，尝试通过Simply Rails 2开始学习RoR。但是我想从最新版本的Ruby（1.9.2）和Rails开始（ 3）所以我被迫在没有书的情况下完成所有配置。我通过谷歌和stackoverflow看了很多。当我运行rails server时，它会自动使用Webrick，但我想使用Mongrel。我通过gem install mongrel --pre安装了预发布的Mongrel并删除了以前的版本。我读到这是为了让Mongrel与rails server一起使用我必须将gem 'mongrel'添加到Gemfile中，但是我不知道应该将它添加到哪一个（我尝试了几个但没有改变） 。所以我决定通过git查看mongrel文档，并在运行时了解mongrel_rails start我得到了这个：
C:\Ruby192\shovell>mongrel_rails start
** Starting Mongrel listening at 0.0.0.0:3000
** Starting Rails with development environment... C:/Ruby192/lib/ruby/gems/1.9.1/gems/bundler-1.0.0.rc.6/lib/bundler/runtime.rb:27:in
'block in setup': You have already activated mongrel 1.2.
0.pre2, but your Gemfile requires mongrel 1.1.5. Consider using bundle exec. (Gem::LoadError)
from C:/Ruby192/lib/ruby/gems/1.9.1/gems/bundler-1.0.0.rc.6/lib/bundler/spec_set.rb:12:in
'block in each'
from C:/Ruby192/lib/ruby/gems/1.9.1/gems/bundler-1.0.0.rc.6/lib/bundler/spec_set.rb:12:in
'each'
from C:/Ruby192/lib/ruby/gems/1.9.1/gems/bundler-1.0.0.rc.6/lib/bundler/spec_set.rb:12:in
'each'
from C:/Ruby192/lib/ruby/gems/1.9.1/gems/bundler-1.0.0.rc.6/lib/bundler/runtime.rb:17:in
'setup'
from C:/Ruby192/lib/ruby/gems/1.9.1/gems/bundler-1.0.0.rc.6/lib/bundler.rb:100:in
'setup'
from C:/Ruby192/shovell/config/boot.rb:8:in '<top (required)>'
from <internal:lib/rubygems/custom_require>:29:in 'require'
from <internal:lib/rubygems/custom_require>:29:in 'require'
from C:/Ruby192/shovell/config/application.rb:1:in '<top (required)>'
from <internal:lib/rubygems/custom_require>:29:in 'require'
from <internal:lib/rubygems/custom_require>:29:in 'require'
from C:/Ruby192/shovell/config/environment.rb:2:in '<top (required)>'
from <internal:lib/rubygems/custom_require>:29:in 'require'
from <internal:lib/rubygems/custom_require>:29:in 'require'
from C:/Ruby192/lib/ruby/gems/1.9.1/gems/mongrel-1.2.0.pre2-x86-mingw32/lib/mongrel/rails.rb:147:in
'rails'
from C:/Ruby192/lib/ruby/gems/1.9.1/gems/mongrel-1.2.0.pre2-x86-mingw32/bin/mongrel_rails:116:in
'block (2 levels) in run'
from C:/Ruby192/lib/ruby/gems/1.9.1/gems/mongrel-1.2.0.pre2-x86-mingw32/lib/mongrel/configurator.rb:149:in
'call'
from C:/Ruby192/lib/ruby/gems/1.9.1/gems/mongrel-1.2.0.pre2-x86-mingw32/lib/mongrel/configurator.rb:149:in
'listener'
from C:/Ruby192/lib/ruby/gems/1.9.1/gems/mongrel-1.2.0.pre2-x86-mingw32/bin/mongrel_rails:102:in
'block in run'
from C:/Ruby192/lib/ruby/gems/1.9.1/gems/mongrel-1.2.0.pre2-x86-mingw32/lib/mongrel/configurator.rb:50:in
'call'
from C:/Ruby192/lib/ruby/gems/1.9.1/gems/mongrel-1.2.0.pre2-x86-mingw32/lib/mongrel/configurator.rb:50:in
'initialize'
from C:/Ruby192/lib/ruby/gems/1.9.1/gems/mongrel-1.2.0.pre2-x86-mingw32/bin/mongrel_rails:86:in
'new'
from C:/Ruby192/lib/ruby/gems/1.9.1/gems/mongrel-1.2.0.pre2-x86-mingw32/bin/mongrel_rails:86:in
'run'
from C:/Ruby192/lib/ruby/gems/1.9.1/gems/mongrel-1.2.0.pre2-x86-mingw32/lib/mongrel/command.rb:210:in
'run'
from C:/Ruby192/lib/ruby/gems/1.9.1/gems/mongrel-1.2.0.pre2-x86-mingw32/bin/mongrel_rails:282:in
'<top (required)>'
from C:/Ruby192/bin/mongrel_rails:19:in 'load'
from C:/Ruby192/bin/mongrel_rails:19:in '<main>'`
我最好的猜测是
C:/Ruby192/lib/ruby/gems/1.9.1/gems/bundler-1.0.0.rc.6/lib/bundler/runtime.rb:27:in
'block in setup': You have already activated mongrel 1.2.
0.pre2, but your Gemfile requires mongrel 1.1.5. Consider using bundle exec.是关键，但我无法解决它。
我会感激任何帮助，以便我可以继续实际学习 语言！
编辑：由于@duddle，我能够解决上述问题，但现在我又遇到了一个问题......我收到了这个错误：
C:\Ruby192\shovell>mongrel_rails start
** Starting Mongrel listening at 0.0.0.0:3000
** Starting Rails with development environment... C:/Ruby192/lib/ruby/gems/1.9.1/gems/activesupport-3.0.0.rc2/lib/active_support/dependencies.rb:239:in
'req uire': no such file to load -- dispatcher (LoadError)
from C:/Ruby192/lib/ruby/gems/1.9.1/gems/activesupport-3.0.0.rc2/lib/active_support/dependencies.rb:239:in 'block in require'
from C:/Ruby192/lib/ruby/gems/1.9.1/gems/activesupport-3.0.0.rc2/lib/active_support/dependencies.rb:225:in 'block in load_dependency'
from C:/Ruby192/lib/ruby/gems/1.9.1/gems/activesupport-3.0.0.rc2/lib/active_support/dependencies.rb:591:in 'new_constants_in'
from C:/Ruby192/lib/ruby/gems/1.9.1/gems/activesupport-3.0.0.rc2/lib/active_support/dependencies.rb:225:in 'load_dependency'
from C:/Ruby192/lib/ruby/gems/1.9.1/gems/activesupport-3.0.0.rc2/lib/active_support/dependencies.rb:239:in 'require'
from C:/Ruby192/lib/ruby/gems/1.9.1/gems/mongrel-1.2.0.pre2-x86-mingw32/lib/mongrel/rails.rb:148:in 'rails'
from C:/Ruby192/lib/ruby/gems/1.9.1/gems/mongrel-1.2.0.pre2-x86-mingw32/bin/mongrel_rails:116:in' block (2 levels) in run'
from C:/Ruby192/lib/ruby/gems/1.9.1/gems/mongrel-1.2.0.pre2-x86-mingw32/lib/mongrel/configurator.rb:149:in 'call'
from C:/Ruby192/lib/ruby/gems/1.9.1/gems/mongrel-1.2.0.pre2-x86-mingw32/lib/mongrel/configurator.rb:149:in 'listener'
from C:/Ruby192/lib/ruby/gems/1.9.1/gems/mongrel-1.2.0.pre2-x86-mingw32/bin/mongrel_rails:102:in' block in run'
from C:/Ruby192/lib/ruby/gems/1.9.1/gems/mongrel-1.2.0.pre2-x86-mingw32/lib/mongrel/configurator.rb:50:in 'call'
from C:/Ruby192/lib/ruby/gems/1.9.1/gems/mongrel-1.2.0.pre2-x86-mingw32/lib/mongrel/configurator.rb:50:in 'initialize'
from C:/Ruby192/lib/ruby/gems/1.9.1/gems/mongrel-1.2.0.pre2-x86-mingw32/bin/mongrel_rails:86:in 'new'
from C:/Ruby192/lib/ruby/gems/1.9.1/gems/mongrel-1.2.0.pre2-x86-mingw32/bin/mongrel_rails:86:in'run'
from C:/Ruby192/lib/ruby/gems/1.9.1/gems/mongrel-1.2.0.pre2-x86-mingw32/lib/mongrel/command.rb:210:in 'run'
from C:/Ruby192/lib/ruby/gems/1.9.1/gems/mongrel-1.2.0.pre2-x86-mingw32/bin/mongrel_rails:282:in '<top (required)>'
from C:/Ruby192/bin/mongrel_rails:19:in 'load'
from C:/Ruby192/bin/mongrel_rails:19:in '<main>
我在这一点上最好的猜测（凌晨1点......非常累）是我错过了一个文件或者没有命名的东西应该是..我可能需要在我的Gemfile中使用:require动作..可能我只需要睡在上面。哈
再次感谢@duddle让我超越第一个错误！非常感谢任何帮助！
答案 0 :(得分：32)
你已经激活了mongrel 1.2。 0.pre2，但你的Gemfile需要mongrel 1.1.5。考虑使用bundle exec。是关键但我无法解决它。
你快到了！
gem 'mongrel', '>= 1.2.0.pre2'
第二个参数告诉bundler需要一个等于或大于1.2.0.pre2的版本，在使用Ruby 1.9.2时必须使用它。
Bundler页面提供了有关如何使用Gemfile的一个很好的参考：http://gembundler.com/gemfile.html
答案 1 :(得分：5)
万一你没弄清楚。
我运行了gem install'dispatcher'并在我的应用程序的Gemfile中添加了gem'dispatcher'。 一切都很好。
根据我对ruby的小经验，每次我都有“需要 - 没有这样的文件加载”的问题。这是因为我错过了一个特定的宝石。
... H个
答案 2 :(得分：4)
将此行添加到您的gem文件中：
gem 'mongrel', '>= 1.2.0.pre2'
在命令提示符下：
运行bundle install
使用此命令启动mongrel：
rails server
答案 3 :(得分：0)
只需添加gem'dispatch'
即可- ）
答案 4 :(得分：0)
mongrel gem与Ruby 1.9.2不兼容;你将不得不使用gem＆＃39; sho-mongrel＆＃39;取而代之。
答案 5 :(得分：0)
尝试使用以下方法安装它：
gem install mongrel --pre
这对我来说很完美！