hit4

class FileUpload < ActiveRecord::Base
  has_attachment :size => 1..1.megabyte,
      :path_prefix => "public/uploadedfiles",
      :storage => :file_system

end


class PostController < ApplicationController
    def new_upload_file
        @upload_file=FileUpload.new
        @files=FileUpload.find :all
    end

    def do_upload
        @attachable_file=FileUpload.new params[:upload_file]
        if @attachable_file.save
            flash[:notice]="Uploaded successfully."            
            redirect_to :action => :new_upload_file

        end
    end
end


<% if flash[:notice] %>
   <%= flash[:notice] %>
<% end %>
<% 
form_for(:upload_file,:url => {:action => "do_upload"},
   :html => {:multipart => true}) do |form| %>
   <%= form.file_field :uploaded_data,:size => 50 %>
   <%= submit_tag "  上传  " %>
<% end %>