module ActiveSupport::Callbacks::ClassMethods

def skip_callback(name, *filter_list, &block)

end
skip_callback :validate, :before, :check_membership, if: -> { self.age > 18 }
class Writer < Person

callback is skipped.
:unless options may be passed in order to control when the
Skip a previously set callback. Like +set_callback+, :if or 
def skip_callback(name, *filter_list, &block)
  type, filters, options = normalize_callback_params(filter_list, block)
  __update_callbacks(name) do |target, chain|
    filters.each do |filter|
      filter = chain.find {|c| c.matches?(type, filter) }
      if filter && options.any?
        new_filter = filter.merge(chain, options)
        chain.insert(chain.index(filter), new_filter)
      end
      chain.delete(filter)
    end
    target.set_callbacks name, chain
  end
end