Add class methods and instance methods to class by including one Module

gistfile1.txt

module A
	
	def self.included(base)
		base.extend(ClassMethods)
	end

	module ClassMethods
	    def all
	      p 'all'
	    end

	    def find(id)
	      p "looking for entity with id=#{id}"
	    end

	    def a
			  p 'AClassMethods'
		  end

  	end
	def a
		p 'a'
	end

end

class Aa
	include A
end

o/p

Aa.a
=> AClassMethods

Aa.all
=> all

Aa.new.a
=> a