RadRails的开发服务器启动错误：load_missing_constant

这里是堆栈跟踪我在控制台中看到：RadRails的开发服务器启动错误：load_missing_constant

C:/ruby/lib/ruby/gems/1.8/gems/activesupport-2.3.2/lib/active_support/dependencies.rb:443:in `load_missing_constant': uninitialized constant ActiveRecord (NameError) 
    from C:/ruby/lib/ruby/gems/1.8/gems/activesupport-2.3.2/lib/active_support/dependencies.rb:80:in `const_missing' 
    from C:/ruby/lib/ruby/gems/1.8/gems/activesupport-2.3.2/lib/active_support/dependencies.rb:92:in `const_missing' 
    from C:/Users/rrevi/Documents/Aptana Studio/developer_portal/config/environment.rb:42 
    from C:/ruby/lib/ruby/gems/1.8/gems/rails-2.3.2/lib/initializer.rb:111:in `run' 
    from C:/Users/rrevi/Documents/Aptana Studio/developer_portal/config/environment.rb:9 
    from C:/ruby/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:in `gem_original_require' 
    from C:/ruby/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:in `require' 
    from C:/ruby/lib/ruby/gems/1.8/gems/activesupport-2.3.2/lib/active_support/dependencies.rb:156:in `require' 
    from C:/ruby/lib/ruby/gems/1.8/gems/activesupport-2.3.2/lib/active_support/dependencies.rb:521:in `new_constants_in' 
    from C:/ruby/lib/ruby/gems/1.8/gems/activesupport-2.3.2/lib/active_support/dependencies.rb:156:in `require' 
    from C:/ruby/lib/ruby/gems/1.8/gems/rails-2.3.2/lib/commands/server.rb:84 
    from C:/ruby/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:in `gem_original_require' 
    from C:/ruby/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:in `require' 
    from ./script/server:3 
    from -e:2:in `load' 
    from -e:2

这之前的罚款。我没有做出env的改变（我记得）。很奇怪。我在Windows Vista机器上运行RadRails。

来源

2010-07-08 Rafael

你正在运行相当过时的rails版本，它说你缺少ActiveRecord宝石。

来源

2010-07-08 18:55:23 Eimantas

我不知道我是否可以通过aptana radrails更新我的红宝石？如果我可以，它会更新我的宝石（并希望让我神秘消失的ActiveRecord宝石）？ – Rafael 2010-07-08 19:11:49

不知道，但我强烈建议不要通过ide更新宝石。我还没有看到一个非常擅长管理宝石的ide。命令提示符是你最好的选择。 – Eimantas 2010-07-09 03:48:24

如果你得到的错误：

helloworld.rb:3:in `<main>': uninitialized constant ActiveRecord (NameError)

那么就意味着你还没有安装ActiveRecord的红宝石宝石。您需要安装宝石，以便Aptana可以找到它，所以您需要了解以下程序：

列出可远程安装的宝石。
搜索可远程安装的宝石。
安装远程宝石。
验证您的宝石已安装。

阅读这一切：http://docs.rubygems.org/read/chapter/2

为了纠正上述错误，这里是你必须做的：

打开命令提示符窗口，并在终端中运行以下命令：

#Find out what gems are installed on your computer: 
gem query --local 

#Take a look at the ActiveRecord gem, see if it is available. 
gem query --remote --name-matches activerecord 

#Get more info about the gem on the remote server. 
gem specification --remote activerecord 

#Install your gem: 
gem install --remote activerecord 

#See if it installed successfully and is in the installed gem list: 
gem query --local

重新启动您的IDE。集锦需要被告知使用你的ActiveRecord的宝石：

require 'active_record';

下面是一个使用ActiveRecord的宝石，看集锦可以找到你的ActiveRecord的宝石一些代码：

#Ruby code 
require 'active_record' 
class Dog < ActiveRecord::Base 
    has_many :dog_tags 
end 
puts "activerecord gem is installed";

这不会产生错误，并且打印“activerecord gem is installed”;

来源

2012-04-26 16:18:45

RadRails的开发服务器启动错误：load_missing_constant

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