# File lib/active_record/validations.rb, line 54 def add_on_empty(attributes, custom_message = nil) for attr in [attributes].flatten value = @base.respond_to?(attr.to_s) ? @base.send(attr.to_s) : @base[attr.to_s] is_empty = value.respond_to?(:empty?) ? value.empty? : false add(attr, :empty, :default => custom_message) unless !value.nil? && !is_empty end end