使用 Rails3 和 Ruby 1.9.2 运行 Mongrel 时出现 LoadError

Question

我是编程新手（以前只做过 html/css/design），试图通过 Simply Rails 2 这本书开始学习 RoR。但是我想从最新版本的 Ruby(1.9.2) 和 Rails (3) 开始，所以我被迫在没有书的情况下配置所有内容。我通过谷歌和 stackoverflow 查了很多资料。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 安装了预发行版 Mongrel，并删除了以前的版本。我读到为了让 Mongrel 与 rails server 一起工作，我必须将 gem 'mongrel' 添加到 Gemfile，但我不知道应该添加哪一个（我尝试了几次但没有任何改变）。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，以便我能够继续实际学习 语言！

编辑：感谢@duddle，我能够解决上述问题，但现在我有另一个问题...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>

我此时的最佳猜测（凌晨 1 点...非常累）是我丢失了一个文件或者某些东西没有按应有的名称命名。也许我需要在 Gemfile 中使用 :require 操作。也许我只需要睡觉。哈。

再次感谢 @duddle 让我克服了第一个错误！任何更多的帮助将不胜感激！

Answer 1

您已经激活了 mongrel 1.2。 0.pre2，但您的 Gemfile 需要 mongrel 1.1.5。考虑使用捆绑执行。是关键，但我一直没能解决。

你就快到了！

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时必须使用该版本。

Bundler 页面提供了有关如何使用 Gemfile 的很好的参考：http://gembundler.com/gemfile.html

Answer 2

以防万一你没弄清楚。

我运行 gem install 'dispatcher' 并在我的应用程序的 Gemfile 中添加了 gem 'dispatcher'。
然后一切都很好。

从我使用 ruby​​ 的小经验来看，每次我都会遇到“需要——没有这样的文件要加载”的问题。这是因为我缺少一个特定的宝石。

呃……

Answer 3

将此行添加到您的 gem 文件中：

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

在命令提示符处：

运行 bundle install

使用以下命令启动 mongrel：

rails server

Answer 4

嘿，我遇到了这个问题，解决方案非常简单：

只需添加 gem 'dispatch'

;-)

Answer 5

mongrel gem 与 Ruby 1.9.2 不兼容；你必须使用 gem 'sho-mongrel' 来代替它。

Answer 6

尝试使用以下命令安装它：

gem install mongrel --pre

它对我来说完美！