Global Variables in Rails3 [duplicate]

This question already has answers here: Closed 11 years ago.

Possible Duplicate:

Where to put Global variables in Rails 3

Is it possible to set Site-Wide Global Variables in Ruby开发者_高级运维 on Rails?

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It is bad practice

$my_global_var = "I am very bad variable!"

• http://www.rubyist.net/~slagell/ruby/globalvars.html
• http://rubylearning.com/satishtalim/ruby_summary2.html

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You can use general Ruby syntax $var_name, but I don't know any case when global variable is a best approach.