How to access a Ruby Module method

I have a Ruby module for constants. It has a list of variables and one metho开发者_如何学Pythond which applies formatting.

I can't seem to access the method in this module. Any idea why?

---

If you include the module the method becomes an instance method but if you extend the module then it becomes a class method.

module Const
  def format
    puts 'Done!'
  end
end

class Car
  include Const
end

Car.new.format # Done!
Car.format # NoMethodError: undefined method format for Car:Class

class Bus
  extend Const
end

Bus.format # Done!
Bus.new.format # NoMethodError: undefined method format

---

module Foo
  def self.hello # This is a class method
    puts "self.hello"
  end

  def hello # When you include this module, it becomes an instance method 
    puts "hello"
  end
end

Foo.hello #=> self.hello

class Bar
  include Foo
end

Bar.new.hello #=> hello

---

Generally, with modules, these things should be happening :

• Autoload path in application.rb, add:

  config.autoload_paths += %W(#{config.root}/lib)
  

• Place module in /lib

• Include module with include NAMEOFMODULE

If the module name has an underscore like "game_engine", you need to use include GameEngine