Class methods and modules

ruby-talk
1

Hello

I wan't to design a Module that defines some methods that I wan't as
class methods in the classes that includes them. Is it possible?

Thanks

···

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2

module MyModule
  module ClassMethods
    def class_method_one( )
      puts "you're in class method one"
    end

    def class_method_two( )
      puts "you're in class method two"
    end
  end # module ClassMethods

  def self.included( other )
    other.extend ClassMethods if Class === other
  end

  def method_one( )
    puts "you're in method one"
  end
end

class C
  include MyModule
end

C.new.method_one #=> you're in method one
C.class_method_one #=> you're in class method one
C.class_method_two #=> you're in class method two

Blessings,
TwP

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On 7/13/07, Pedro Cardoso <cardosojp@netcabo.pt> wrote:

Hello

I wan't to design a Module that defines some methods that I wan't as
class methods in the classes that includes them. Is it possible?

Thanks

3

Hi. Thanks!

I found another way.

Module MyModule
  def m
  end
end

class MyClass
extend MyDodule
end

MyClass.m

Can anyone explain the "job" of extend?

Thanks.

···

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4

Pedro Cardoso wrote:

Hi. Thanks!

I found another way.

Module MyModule
  def m
  end
end

class MyClass
extend MyDodule
end

MyClass.m

Can anyone explain the "job" of extend?

Thanks.

Extend includes the methods in the singleton class. E.g.
MyClass.extend(MyModue) is (almost) equivalent to:
class <<MyClass
  include MyModule
end
Only almost because iirc a different callback is used.

Regards
Stefan

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