在Ruby的类中找不到包含的Module方法

Question

I'm getting no method found error for my module methods. They are defined like so:

module MyModule
  def my_method
    "stuff"
  end
end

And the class is like this:

class MyClass
  include MyModule
  def self.do_stuff
    my_method
  end
end

Then I'm trying to call it like so:

MyClass.do_stuff

I'm getting

undefined method 'my_method" for MyClass:Class

I have also tried

self.my_method

in the Module, but no luck. I should mention this is a vanilla ruby class within a rails application. application.rb includes the following line

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

and in the console I can verify that the module is getting loaded. Any ideas on this? Thanks

Answer 1

you want to use extend to make the method a class method.

class MyClass
  extend MyModule
  def self.do_stuff
    my_method
  end
end

Answer 2

Define functions in module as module_function and it should work.

module MyModule
  module_function
  def my_method
    "stuff"
  end
end