Showing an example of class instance variables.

Class Instance Variables

module Bar
  def self.included(base)
    base.extend(ClassMethods)
  end
  
  def event_name
    self.class.event
  end
  
  module ClassMethods
    
    def event_name(name)
      @event_name = name.to_sym
    end
    
    def event
      @event_name
    end
    
  end
  
end

class Foo
  include Bar
end

class Baz < Foo
  event_name :cool
end

Baz.event 
#=> :cool
Baz.new.event_name
#=> :cool