Ruby：向现有模块添加方法

Question

There is a module:

module ActionDispatch
  module Routing
  end
end

And methods:

def add_movie_path
end

def edit_movie_path
end

How I can add to module Routing this methods?

Is this only way?

Answer 1

Try:

module ActionDispatch
  module Routing
    def add_movie_path
    end

    def edit_movie_path
    end
     module_function :edit_movie_path
  end
end

So that then you can do a call like it is a instance method like so:

class Make
   include ActionDispatch::Routing
end 


class MakeAll
   def only_needs_the_one_method
      ActionDispatch::Routing.edit_movie_path
   end
end 

You can also define it as a class method by using self.class_name and then directly access it like so:

module ActionDispatch
  module Routing
    def self.add_movie_path
    end

    def self.edit_movie_path
    end
  end
end

class Make
    include ActionDispatch::Routing
   def do_something
     ActionDispatch::Routing.add_movie_path
   end
end 


class MakeAll
   def only_needs_the_one_method
      ActionDispatch::Routing.edit_movie_path
   end
end

See that Modules Magic for more.

Answer 2

Unless I misunderstand what you're asking, how about something like:

module ActionDispatch
  module Routing
    def add_movie_path
    end

    def edit_movie_path
    end
  end
end

Alternatively, you could use module_eval .

Answer 3

Simply put your methods inside the module.

module ActionDispatch
  module Routing
    def add_movie_path
    end

    def edit_movie_path
    end  
  end
end