setup settings send to its parent class in ruby

how can i write this (child) class like so:

class child < parent开发者_开发百科
  create_columns :name, :address
end

so that:

class parent
# Can access the create_columns set by the child class?
end

Thanks.

---

You can solve this by using the inherited hook method in Ruby, so you can track all the children.

class Parent
 self.inherited(base)
    self.children << base
  end
end

class Child < Parent
def initialize
  @@instances << self
end

def self.instances
  @@instances
end

Now you can do things like Parent.children.each { |child| child.instances.collect(:&name) }. If name is accessable :-)

Hope that helps!