How to exec a module method when "include Module" from a Class?

ruby-talk
1

Hi, I have a class C that includes a module M.
I need that when a C object is created a module M method is runned
automatically (without call it from "initialize" method) to fill an object
attribute. Something as:

···

---------------------------------------
module M
  def module_method
    @words << "module_word"
  end
end

class C
  include C

  attr_reader :words

  def initialize
    @words =
    @words << "class_word"
  end
end
---------------------------------------

c=C.new
c.words

["class_word", "module_word"]

Is it possible without adding "module_method()" in class C initialize method?

Thanks a lot.

--
Iñaki Baz Castillo

2

Of course I could use inheritance and super method in "initialize()"
but in fact I need to include more than a module so inheritance
(single using "class < class") is not valid for me.

···

2008/5/1, Iñaki Baz Castillo <ibc@aliax.net>:

> c=C.new
> c.words
["class_word", "module_word"]

Is it possible without adding "module_method()" in class C initialize method?

--
Iñaki Baz Castillo
<ibc@aliax.net>

3

You can try overwrite initialize method from the module

module M

       def self.included(classname)
       classname.class_eval <<-EOS
       alias_method :old_initialize, :initialize
         def initialize
           old_initialize
           module_method
         end
       EOS
       end

       def module_method
               @words << "module_word"
       end
end

class C

       attr_reader :words

       def initialize
               @words =
               @words << "class_word"
       end

       include M
end

Sandro
www.railsonwave.com

···

On Fri, May 2, 2008 at 7:32 AM, Iñaki Baz Castillo <ibc@aliax.net> wrote:

2008/5/1, Iñaki Baz Castillo <ibc@aliax.net>:

> > c=C.new
> > c.words
> ["class_word", "module_word"]
>
>
> Is it possible without adding "module_method()" in class C initialize method?

Of course I could use inheritance and super method in "initialize()"
but in fact I need to include more than a module so inheritance
(single using "class < class") is not valid for me.

--
Iñaki Baz Castillo
<ibc@aliax.net>

--
Go outside! The graphics are amazing!

4

Great !!!
I didn't know the meaning of "included" class method of Module. Very
useful in conjunction with "class_eval"
:slight_smile:

Thanks a lot.

···

2008/5/2, Sandro Paganotti <sandro.paganotti@gmail.com>:

You can try overwrite initialize method from the module

module M

       def self.included(classname)
       classname.class_eval <<-EOS
       alias_method :old_initialize, :initialize
         def initialize
           old_initialize
           module_method
         end
       EOS
       end

       def module_method
               @words << "module_word"
       end
end

class C

       attr_reader :words

       def initialize
               @words =
               @words << "class_word"
       end

       include M
end

--
Iñaki Baz Castillo
<ibc@aliax.net>