Question

I have following method in one of my module

def current_user
end

def current_user=(new_user)
end

What i wanted to know is what is the use of the method current_user=(new_user).
I also like to know following things
1. Can we declare such methods in model, controller
2. how to call such methods
3. documentation link for such things

Answer 1

By default all variables in ruby are private. It’s possible to access them only via methods (often named geters and setters). So

def current_user
end

is getter and

def current_user=(new_user)
end

is setter

To better understand, you can read this article:
http://zetcode.com/lang/rubytutorial/oop2/

UPD: Such methods you can use in controllers, models – in any class