错误上载的文件上传波

我CarrierWave工作正常，直到我不得不对我的表更改字段名（其中CarrierWave被安装到现场），现在当我尝试上传文件，我得到：错误上载的文件上传波

**ActiveRecord::StatementInvalid in PhotosController#create** 
**TypeError: can't cast ActionDispatch::Http::UploadedFile to string: INSERT INTO "photos" ("album_id", "created_at", "rel", "road", "updated_at") VALUES (?, ?, ?, ?, ?)**

我的代码：

Photo.rb

class Photo < ActiveRecord::Base 
    belongs_to :album 

    attr_accessible :legend, :road, :rel 

    mount_uploader :road, UpperUploader 
end

的上传

class UpperUploader < CarrierWave::Uploader::Base 
    storage :file 
    def store_dir 
    "../app/uploads/#{model.class.to_s.underscore}/#{mounted_as}/#{model.album_id}" 
end

上PhotosController的创建操作

def new 
    @photo = Photo.new 
end 

def create 
    params[:photo][:road].each do |p| 
     photo = Photo.new 
     photo.road = p 
     photo.rel = p 
     photo.album_id = session[:current_album] 
     photo.save 
    end 

    render 'manage' 
end 

def photo_params 
     params.require(:photo).permit(:legend, :road, :album_id, :rel) 
end

我_form部分用来上传文件：

<%= form_for @photo , html: { multipart: true } do |f| %> 
    <% if @photo.errors.any? %> 
    <div id="error_explanation"> 
     <h2><%= pluralize(@photo.errors.count, "error") %> prohibited this photo from being saved:</h2> 

     <ul> 
     <% @photo.errors.full_messages.each do |msg| %> 
     <li><%= msg %></li> 
     <% end %> 
     </ul> 
    </div> 
    <% end %> 

    <div class="field"> 
    <%= f.label :road %><br> 
    <%= f.file_field :road, :multiple => 'multiple' %> 
    </div> 
    <div class="actions"> 
    <%= f.submit %> 
    </div> 

<% end %>

我改变上传列名（什么是“道路“），通过迁移，当然，我试图改变所有'路径'的名字我的代码是'道路'。我试图关闭并打开服务器多次，错误仍然存在。

任何帮助？

PS：本