How to call a static method on a class module?

Question

ruby

noob question .. Let's say we have

# tmp.rb
module FooModule
  def self.foo_method
    puts 'TestModule'
  end
end

class BarClass
  include FooModule
end

As you can see in the code above, we have a class BarClassthat includes a module FooModule
. Accordingly, the class has a static method foo_method
. Why can't I access it?

$ irb
2.4.1 :001 > require './tmp.rb'
 => true 
2.4.1 :002 > BarClass.foo_method
NoMethodError: undefined method `foo_method' for BarClass:Class
        from (irb):2
        from /home/shaks/.rvm/rubies/ruby-2.4.1/bin/irb:11:in `<main>'
2.4.1 :003 >

Answer 1

include - adds module methods to an object.
extend - calls include on the object's singleton class.
Correct option:

module FooModule
  def foo_method
    puts 'TestModule'
  end
end

class BarClass
  extend FooModule
end

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