gistfile1.rb

def validate_inputs
  self.form.descendants.any_in(:html_tag => ["input", "select", "textarea"]).excludes("html_attributes.type" => "submit").each do |element|
    attr = "input_" + element.html_attributes["name"]
    element.errors.add(:attr, " muss ausgefüllt werden") if element[attr].blank? && element["required"]
  ...
  end
end