ruby - 使用 Rails3 和 Ruby 1.9.2 运行 Mongrel 时出现 LoadError

Question

我是编程新手(以前只学过 html/css/design)，想通过 Simply Rails 2 这本书开始学习 RoR。不过，我想从最新版本的 Ruby(1.9.2) 和 Rails ( 3)所以我被迫在没有这本书的情况下配置所有内容。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。我读到为了让 Mongrel 与 rails server 一起工作，我不得不将 gem 'mongrel' 添加到 Gemfile，但我不知道我应该添加哪一个它到(我尝试了几次但没有改变)。所以我决定通过 git 查看 mongrel 文档并了解 mongrel_rails start 当我运行时我得到了这个:

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':您已经激活了 mongrel 1.2。
0.pre2，但您的 Gemfile 需要 mongrel 1.1.5。考虑使用 bundle exec。 是关键，但我一直无法解决它。

我将不胜感激任何帮助，以便我可以继续实际学习语言!

编辑:感谢@duddle，我能够解决上述问题，但现在我遇到了另一个问题...我收到此错误:

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>

此时(凌晨 1 点......非常累)我最好的猜测是我丢失了一个文件或某些东西没有按应有的方式命名..也许我需要使用 :require在我的 Gemfile 中执行操作……也许我只需要睡一觉。哈。

再次感谢 @duddle 让我克服了第一个错误!非常感谢任何更多帮助!

Answer 1

You have already activated mongrel 1.2. 0.pre2, but your Gemfile requires mongrel 1.1.5. Consider using bundle exec. is the key but I have not been able to solve it.

你快到了!

gem 'mongrel', '>= 1.2.0.pre2'

第二个参数告诉 bundler 需要等于或大于 1.2.0.pre2 的版本，在使用 Ruby 1.9.2 时必须使用它。

Bundler 页面提供了一个关于如何使用 Gemfile 的很好的引用:http://gembundler.com/gemfile.html