CODEWITHSUNDEEP
ruby
user1934428
user1934428

Reputation: 22291

Invoking 'initialize' of several included modules in Ruby

If I include a module into a class, which has initialize defined, I can call it using super:

module M
  def initialize(x)
    @m = x
  end
end

class MyClass
  def initialize
    super(3)
  end

  def val
    @m
  end
end

MyClass.new.val
#  => 3

But how do I code this, if I have several modules, and maybe also a parent class?

class Parent
  def initialize(x)
    @p = x
  end
end

module M
  def initialize(x)
    @m = x
  end
end

module N
  def initialize(x)
    @n = x
  end
end

class MyClass < Parent
  include M
  include N
  def initialize
    # ???? How to initialize here?
  end

  def val
    [@m,@n,@p]
  end
end

I guess that super(100) within MyClass::initialize would set the variable @n, because N is the "most recent" ancestor, but how do I call the initialize methods in M and Parent?

Upvotes: 3

Views: 185

Answers (1)

MurifoX
MurifoX

Reputation: 15089

Take a look at this blog post (http://stdout.koraktor.de/blog/2010/10/13/ruby-calling-super-constructors-from-multiple-included-modules/). It explains how do you use the initialize from different included modules.

Upvotes: 2

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