原书写的是
ruby script/generate scaffold product Admin
但是本人的系统是 苹果的lion ，再看版本
ruby -v
ruby 1.8.7 (2010-01-10 patchlevel 249) [universal-darwin11.0]
rails -v
Rails 3.1.1
gem -v
1.8.11
rails generate scaffold product Admin
Missing type for attribute 'Admin'.
Example: 'Admin:string' where string is the type.
最终的写法是
rails generate scaffold product 'Admin:string'
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