ruby-on-rails-3 – SimpleForm默认输入类

输出如下内容的东西：

<div class="controls"><input autofocus="autofocus" class="string required span12" id="user_first_name" name="user[first_name]" required="required" size="50" type="text" value=""></div>

我试过用config.wrappers玩这个

ba.use :input,:wrap_with => { :class => 'span12' }

不起作用.它添加到包装器而不是修改输入标签.有什么想法吗？

SimpleForm.setup do |config|
  config.wrappers :bootstrap,:tag => 'div',:class => 'control-group',:error_class => 'error' do |b|
    b.use :html5
    b.use :placeholder
    b.use :label
    b.wrapper :tag => 'div',:class => 'controls' do |ba|
      ba.use :input
      ba.use :error,:wrap_with => { :tag => 'span',:class => 'help-inline' }
      ba.use :hint,:wrap_with => { :tag => 'p',:class => 'help-block' }
    end
  end
  config.default_wrapper = :bootstrap
end