How to deal with vendor/plugins after upgrading to rails 3.2.1

Question

After upgrading to rails3.2.1,this warning occurs:

You have Rails 2.3-style plugins in vendor/plugins! Support for these plugins will be removed in Rails 4.0. Move them

Answer 1

I just wrote a blog post on this: How to Convert Simple Rails 2.3 Style Plugins for Rails 3.2