Rails未定义的方法`env'：模块

我想测试一下mongodb与RoR的水位。我想用下面的命令来创建项目：Rails未定义的方法`env'：模块

输出

rails mono_test_app -m http://gist.github.com/raw/284753/b5584c78fb5d29ab39a8218090801ea89b95a541/Rails%20MongoMapper%20Template

部分是

create log/test.log 
    applying template: http://gist.github.com/raw/284753/b5584c78fb5d29ab39a8218090801ea89b95a541/Rails%20MongoMapper%20Template 
    executing rm public/index.html from /Users/olle/Projects/mono_test_app 
    executing rm public/images/rails.png from /Users/olle/Projects/mono_test_app 
    executing rm public/javascripts/controls.js from /Users/olle/Projects/mono_test_app 
    executing rm public/javascripts/dragdrop.js from /Users/olle/Projects/mono_test_app 
    executing rm public/javascripts/effects.js from /Users/olle/Projects/mono_test_app 
    executing rm public/javascripts/prototype.js from /Users/olle/Projects/mono_test_app 
     file app/views/layouts/application.html.erb 
       What should I call the database? 
experiment 
undefined method `env' for Rails:Module 
Projects olle$

我与-m参数指定模板包含

# MongoDB FTW! 
db_name = ask('What should I call the database? ') 

initializer 'database.rb', <<-CODE 
MongoMapper.database = "#{db_name}-#{Rails.env}" 
CODE 

file 'config/database.yml', <<-CODE 
# Using MongoDB 
CODE

Allot公司github上的人似乎已经分叉或克隆了这个要点并且似乎使用它，为什么在我的系统中会发生这种错误？我错过了什么吗？

我曾尝试在两个OSX和Ubuntu与红宝石1.8.7（2008-08-11 PATCHLEVEL 72）[i686的-darwin9.7.0] 滑轨2.3.3

来源

2010-02-05 olle

Rails.env是rails 3.0的做法。如果您不使用此版本，请使用RAILS_ENV代替

来源

2010-02-05 13:34:40 marcgg

我认为原因在于，某处在代码Rails.env被使用。这是相当新的，我怀疑是否在rails 2.3.3中可以这样做。搜索该短语并将其替换为RAILS_ENV以查看是否有帮助。

来源

2010-02-05 13:32:47

Rails未定义的方法`env'：模块

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