对多个控制器操作使用的表单进行Rails验证

Question

使用此代码进行下面的编辑和更新操作。我面临2个问题

1. 如何确定提交的表格（基本，照片，兴趣或详情？）

2. 我已经设置了validates_presence_of所有配置文件字段，但是这个表单通常用于两个控制器操作（因此不是每个属性都匹配）并且我得到错误。

我该如何解决这个问题？

def edit 
  def sub_layout
    "left"
  end

  @profile = Profile.find params[:id]
  #authorize! :update, @profile

  what = params[:what]
  if ["basics", "location", "details", "photos", "interests"].member?(what)
    render :action => "edit_#{what}"
  else
    render :action => "edit_basics"
  end

end

def update
  @profile = Profile.find(params[:id])

  respond_to do |format|
    if @profile.update_attributes(params[:profile])
      format.html { redirect_to @profile, notice: 'Profile was successfully updated.' }
    else
      format.html {

        #there was an error,
        #redirect to the correct "what" form /edit/basics for example
        # what is empty how to get the value or a better way for this?

        what = params[:what]
        render :action => "edit_#{what}"

      }


    end
  end
end