gistfile1.rb

module AllIfAny
  
  def validates_all_if_any(fields, options={})
    fields = [fields].flatten
    all_fields = fields.dup
    validates_each(fields, options) do |record, attr_name, value|
      if !(all_fields.find_all{|f| !record.send(f).to_s.empty?}.empty?)
        record.errors.add(attr_name, (options[:message] || 'is invalid')) if value.to_s.empty?
      end
    end
  end
  
end