add a static method to a subclass in ruby

To add a static method to a Ruby subclass, you can use the self keyword in the method definition to create a class-level method. Here's an example of how to do this:

main.rb
class Parent
  def self.static_method
    puts "This is a static method in the Parent class"
  end
end

class Child < Parent
  def self.another_static_method
    puts "This is another static method, added to the Child subclass"
  end
end

Parent.static_method # This is a static method in the Parent class
Child.static_method # This is a static method in the Parent class
Child.another_static_method # This is another static method, added to the Child subclass
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In the example above, we've defined a static_method on the Parent class using the self keyword in the method definition. When we call Parent.static_method, it will execute the method and print out the message.

We've also created a Child subclass of Parent, and added another static method called another_static_method. When we call Child.another_static_method, it will print out a different message.

Note that both the Parent class and the Child subclass can call the static_method, but only the Child class can call the another_static_method. This is because another_static_method is defined only on the Child class, not on the Parent class.