Ruby - using class instance to access same named methods from different modules

Question

I have 2 Modules M1 and M2 each containing same method name as met1

I have a class MyClass which includes these modules. I create an instance test of MyClass, now I want to call met1 from each module. Is it possible to do so?

here is the code:

module M1
def met1
    p "from M1 met1.."
end
end
module M2
def met1
    p "from M2 met1 ..."
end
end

class MyClass

include M1, M2
def met2
    p "met2 from my class"
end
end

test = MyClass.new
test.met1 # From module 1
test.met2 # from my class
test.met1 # from module 2 (how to ?)

Please let me know how to do this.

My output is

"from M1 met1.."
"met2 from my class"
"from M1 met1.."

This might be a very simple query but please answer. Thanks

Arup Rakshit · Accepted Answer · 2013-11-17 09:30:58Z

4

now I want to call met1 from each module. Is it possible to do so?

Yes,possible. Use Module#instance_method to create first UnboundMethod. Then do call UnboundMethod#bind to bind test object. Now you have Method object with you. So call now Method#call to get your expected output.

module M1
  def met1
    p "from M1 met1.."
  end
end
module M2
  def met1
    p "from M2 met1 ..."
  end
end

class MyClass

  include M1, M2
  def met2
    p "met2 from my class"
  end
end

test = MyClass.new

test.class.included_modules.each do |m|
  m.instance_method(:met1).bind(test).call unless m == Kernel
end
# >> "from M1 met1.."
# >> "from M2 met1 ..."

edited Nov 17, 2013 at 9:30

answered Nov 17, 2013 at 9:23

Arup Rakshit

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3 Comments

Boris Stitnicky Over a year ago

+1. Is it just me, or is SO somewhat dead these days?

rahoolm Over a year ago

By the way, could you please explain me what does m == Kernel exactly means?

Arup Rakshit Over a year ago

@rahoolm Object is a default superclass of MyClass. Object includes Kernel. So Kernel is included in MyClass too. But meth is not defined in that Kernel module.Thus to avoid Kernel, I used that if condition. Just do test.class.included_modules,you will get to see that.

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