RadRails的開發服務器啓動錯誤：load_missing_constant

這裏是堆棧跟蹤我在控制檯中看到：RadRails的開發服務器啓動錯誤：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

這之前的罰款。我沒有做出env的改變（我記得）。很奇怪。我在Windows Vista機器上運行RadRails。

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2010-07-08 Rafael

你正在運行相當過時的rails版本，它說你缺少ActiveRecord寶石。

來源

2010-07-08 18:55:23 Eimantas

我不知道我是否可以通過aptana radrails更新我的紅寶石？如果我可以，它會更新我的寶石（並希望讓我神祕消失的ActiveRecord寶石）？ – Rafael 2010-07-08 19:11:49

不知道，但我強烈建議不要通過ide更新寶石。我還沒有看到一個非常擅長管理寶石的ide。命令提示符是你最好的選擇。 – Eimantas 2010-07-09 03:48:24

如果你得到的錯誤：

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

那麼就意味着你還沒有安裝ActiveRecord的紅寶石寶石。您需要安裝寶石，以便Aptana可以找到它，所以您需要了解以下程序：

列出可遠程安裝的寶石。
搜索可遠程安裝的寶石。
安裝遠程寶石。
驗證您的寶石已安裝。

閱讀這一切：http://docs.rubygems.org/read/chapter/2

爲了糾正上述錯誤，這裏是你必須做的：

打開命令提示符窗口，並在終端中運行以下命令：

#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

重新啓動您的IDE。集錦需要被告知使用你的ActiveRecord的寶石：

require 'active_record';

下面是一個使用ActiveRecord的寶石，看集錦可以找到你的ActiveRecord的寶石一些代碼：

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

這不會產生錯誤，並且打印「activerecord gem is installed」;

來源

2012-04-26 16:18:45

RadRails的開發服務器啓動錯誤：load_missing_constant

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