Ruby "append_features" method demo

append_features.rb

module MyModule
  def self.append_features(base)
    puts "IN 'append_features':"
    puts "  - BEFORE execution: #{base.instance_methods.include? :some_method}"
    super
    puts "  - AFTER  execution: #{base.instance_methods.include? :some_method}"
  end

  def self.included(base)
    puts "IN 'included':  #{base.instance_methods.include? :some_method}"
  end
  
  def some_method() end
end
 
class MyClass
 include MyModule
end


# Output:
#
#   IN 'append_features':
#     - BEFORE execution: false
#     - AFTER  execution: true
#   IN 'included':  true