Forum: Ruby How to know in which class we are when inheriting

Look at this code:
class One
  def initialize
    puts self.class
  end
end


class Two < One
  def initialize
    super()
    puts self.class
  end
end

Two.new()

I want to know that when in initialize in One Class we are in One class
and when in Two the same... but it seems that Ruby thinks that we are
always in Two.... any idea how to do this?
btw I'm using Ruby 1.8.7

Hi,

the "self" keyword is always resolved in the current context. So when 
you call an inherited method or super(), "self" always points to the 
current instance and not the originating class or something. This 
wouldn't even make sense in your case, because there is no instance of 
One that "self" could refer to.

If you want to know the class where a certain method is defined, use 
Method#owner:

#-----------------
class A
  def f
    puts method(:f).owner
  end
end

class B < A; end

b = B.new
b.f
#-----------------

However, I have a bad feeling about what you're going to do with this. 
What are you trying to do?

Well, it is more complicated what i want to do... but doint it like you 
said i got the first class where all the others are inheriting from... 
and that's not what i want.

Take a look at this example more similar to the thing I need:
(I need to know that what is failing is the setup on class Two)

require 'test/unit'

#This is the TestCase class inside the framework i'm developing
class TestCase < Test::Unit::TestCase
    undef_method :default_test
      def whoami
        return method(:whoami).owner
      end

      def assert(value,*message)
        report(value,message.join)
        return super(value,message.join)
      end

      def report(value,*message)
        if value==false then
          puts "*" * 20
          puts whoami
          puts "#" * 20
        end
      end

  end

#I want people to write testcases using my new testcase class, like 
these ones
class One < TestCase
  def setup
    super()
    assert(true,"blabla")
  end

end


class Two < One
  def setup
    super()
    assert(false,"dos")
  end
end



class MyTestCase < Two
  def test01
    assert(true,"hola")
  end
end






Jan E. wrote in post #1086850:
> Hi,
>
> the "self" keyword is always resolved in the current context. So when
> you call an inherited method or super(), "self" always points to the
> current instance and not the originating class or something. This

On Wed, Nov 28, 2012 at 12:51 PM, Mario Ruiz <lists@ruby-forum.com> 
wrote:
> Well, it is more complicated what i want to do... but doint it like you
> said i got the first class where all the others are inheriting from...
> and that's not what i want.

Well, but that's the way it is. :-)

> Take a look at this example more similar to the thing I need:
> (I need to know that what is failing is the setup on class Two)

You can see that from the stack trace.  And you can also provide
meaningful comment.

$ ruby x.rb
/usr/lib/ruby/gems/1.9.1/gems/minitest-4.3.0/lib/minitest/unit.rb:192:in
`assert': in two (MiniTest::Assertion)
        from /usr/lib/ruby/1.9.1/test/unit/assertions.rb:38:in `assert'
        from x.rb:15:in `initialize'
        from x.rb:19:in `new'
        from x.rb:19:in `<main>'

$ cat -n x.rb
     1
     2  require 'test/unit'
     3
     4  class TC < Test::Unit::TestCase
     5  end
     6
     7  class One < TC
     8    def initialize
     9      assert true, "in one"
    10    end
    11  end
    12
    13  class Two < One
    14    def initialize
    15      assert false, "in two"
    16    end
    17  end
    18
    19  t = Two.new
    20


Cheers

robert

Hey Robert it doesn't work for me that way, i'm using 1.8.7 and i cannot 
use 1.9

Robert Klemme wrote in post #1086879:

On Wed, Nov 28, 2012 at 2:48 PM, Mario Ruiz <lists@ruby-forum.com> 
wrote:
> Hey Robert it doesn't work for me that way, i'm using 1.8.7 and i cannot
> use 1.9

I am surprised that 1.8 behaves differently.  What happens if you
execute the code I posted with 1.8.7?

Cheers

robert

C:/Ruby187/lib/ruby/1.8/test/unit/testcase.rb:125:in `add_assertion': 
undefined method `add_assertion' for nil:NilClass (NoMethodError)
  from C:/Ruby187/lib/ruby/1.8/test/unit/assertions.rb:494:in 
`_wrap_assertion'
  from C:/Ruby187/lib/ruby/1.8/test/unit/assertions.rb:61:in `assert'
  from xxx.rb:14:in `initialize'
  from xxx.rb:18:in `new'
  from xxx.rb:18

Robert Klemme wrote in post #1086914: