> It's not a global function. It's an instance method added to all
> controllers

Ok, but I want to render a template in this function.
How can I do that if I put it outside the controller (for example,
into a separate class in a /lib folder)?

Other answers are really helpful, thank you :)
Actually I still cannot force my Mailer to work, it reports about
"undefined method `activation_email'", although this method exists and
is an instance (not class) method....
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