Changing intendation ruby/emacs-mode?

[ssecorp]

emacs indents 2 chars only by defualt in ruby-mode.

how can I change to 4?

 

[fireinice]

add line followed to the ruby-mode-hook:

as a sample:
(add-hook 'ruby-mode-hook
(lambda()
(set (make-local-variable 'tab-width) 4)))

 

[Will Parsons]

add line followed to the ruby-mode-hook:

as a sample:
(add-hook 'ruby-mode-hook
(lambda()
(set (make-local-variable 'tab-width) 4)))

^^^^^^^^^
I think you mean: ruby-indent-level