Rails 为所有命令行方法（例如生成或 rake）提供 NameError

我是 Rails 的初学者，过去几天我一直试图找出这里到底出了什么问题，但完全没有运气。我到处寻找，但一无所获。基本上，当我运行任何类型的命令行方法时，我都会收到 NameError。我也尝试过在不同的项目目录中运行它，并且曾经有效。看来铁轨已经坏了...

我正在运行 Win7-32​​bit，使用 NetBeans 6.9.1 编辑文件，使用 cmd.exe 运行 Rails 控制台。

大约两周以来一切都运转良好，然后突然发生这种情况。这里有一些例子：

Rails 生成模型：

irb(main):004:0> rails generate model datatest  
NameError: undefined local variable or method `datatest' for main:Object  
from (irb):4  
from C:/Ruby192/lib/ruby/gems/1.9.1/gems/railties-3.0.3/lib/rails/commands/console.rb:44:in `start'  
from C:/Ruby192/lib/ruby/gems/1.9.1/gems/railties-3.0.3/lib/rails/commands/console.rb:8:in `start'  
from C:/Ruby192/lib/ruby/gems/1.9.1/gems/railties-3.0.3/lib/rails/commands.rb:23:in `<top (required)>'  
from script/rails:6:in `require'  
from script/rails:6:in `<main>' 

Rails 生成迁移：

irb(main):003:0> rails generate migration rename_password_to_hashed_password  
NameError: undefined local variable or method `rename_password_to_hashed_password' for main:Object  
from (irb):3  
from C:/Ruby192/lib/ruby/gems/1.9.1/gems/railties-3.0.3/lib/rails/commands/console.rb:44:in `start'  
from C:/Ruby192/lib/ruby/gems/1.9.1/gems/railties-3.0.3/lib/rails/commands/console.rb:8:in `start'  
from C:/Ruby192/lib/ruby/gems/1.9.1/gems/railties-3.0.3/lib/rails/commands.rb:23:in `<top (required)>'  
from script/rails:6:in `require'  
from script/rails:6:in `<main>' 

耙数据库：迁移：

irb(main):005:0> rake db:migrate  
NameError: undefined local variable or method `migrate' for main:Object  
from (irb):5  
from C:/Ruby192/lib/ruby/gems/1.9.1/gems/railties-3.0.3/lib/rails/commands/console.rb:44:in `start'  
from C:/Ruby192/lib/ruby/gems/1.9.1/gems/railties-3.0.3/lib/rails/commands/console.rb:8:in `start'  
from C:/Ruby192/lib/ruby/gems/1.9.1/gems/railties-3.0.3/lib/rails/commands.rb:23:in `<top (required)>'  
from script/rails:6:in `require'  
from script/rails:6:in `<main>' 

任何形式的帮助将非常感激。谢谢！

这些命令不能在 irb 中运行，您必须直接从 cmd.exe 启动它们。