Question

My application in many action use render :nothing => true. I want be DRY. How can I say to rails by default render nothing for a particular controller?

Answer 1

This might do what you need:

before_filter :render_nothing

private
def render_nothing
  render :nothing => true
end

before_filter and not after_filter because the latter is executed after the action finished, which means, after the content was rendered.
Source: http://ap.rubyonrails.org/classes/ActionController/Filters/ClassMethods.html#M000128