Dear Rails users!

I have STI models in my Rails application. The ancestor model has validations with the validates_... methods which are working fine.

But I have custom validations as well, and I would like to add more different custom validations in the descendants. These custom validations would depend on the class.

If I write

class DescendantA < Ancestor

  protected
    def validate
      # ...
    end
end

It simply overwrites the original validations. Is there a convention to do this in Rails?