将angular指令添加到rails中的simple_form会破坏集合输入的选定选项

不确定是否有解决方法,我做错了,或者这是简单形式或角度之间的碰撞,但是:

.field
  = f.input :role, collection: roles.map(&:name), selected: user.role.try(:name), include_blank: 'Select', required: true, input_html: { "ng-model" => "role" }

渲染(看起来正确):

   
      Select
      system
      fcm
      regulatory
      operations
      help_desk
     

但所选值是include_blank"选择" 的值.是的,role是在用户上设置的.