Ruby on rails 4 如何使用carrierwave gem（win7）在rails中查看和编辑上载的excel工作表

我是rails新手，想用我的上传程序完成以下任务-

1） 以可编辑模式在rails中查看上载的excel工作表

2） 将编辑过的工作表保存在数据库（sqlite3）中

我真的不知道如何使用这个“视图方法”（在控制器中）来获得我的解决方案，这就是为什么将视图方法保留为空

另外，请解释“resume.attachment\uURL”在中的作用 在index.html.erb中

谢谢， 阿祖·戈亚尔

routes.rb

Rails.application.routes.draw do

   resources :resumes, only: [:index, :new, :create, :destroy]
   root "resumes#index"

  get 'resumes/index'

  get 'resumes/new'

  get 'resumes/create'

  get 'resumes/destroy'

Model-Resume.rb

class Resume < ActiveRecord::Base
 mount_uploader :attachment, AttachmentUploader # Tells rails to use this uploader for this model.
   validates :name, presence: true # Make sure the owner's name is present.
   validates :attachment, presence: true 
end

class Resume

resume_controller.rb

class ResumesController < ApplicationController
   def index
      @resumes = Resume.all
   end

   def new
      @resume = Resume.new
   end

   def create
      @resume = Resume.new(resume_params)

      if @resume.save
         redirect_to resumes_path, notice: "The resume #{@resume.name} has been uploaded."
      else
         render "new"
      end

   end

   def view

   end


   def destroy
      @resume = Resume.find(params[:id])
      @resume.destroy
      redirect_to resumes_path, notice:  "The resume #{@resume.name} has been deleted."
   end

   private
      def resume_params
      params.require(:resume).permit(:name, :attachment)
   end

end

class ResumesController

new.html.erb

<% if !@resume.errors.empty? %>
   <div class = "alert alert-error">

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

   </div>
<% end %>

<div class = "well">
   <%= form_for @resume, html: { multipart: true } do |f| %>
      <%= f.label :name %>
      <%= f.text_field :name %><br />
      <%= f.label :attachment %>
      <%= f.file_field :attachment %><br />
      <%= f.submit "Save", class: "btn btn-primary" %>
   <% end %>
</div>

index.html.erb

<% if !flash[:notice].blank?%>
   <div class="alert alert-info">
    <%= flash[:notice]%>

   </div>
<%end%>
<br />

<%= link_to "New File", new_resume_path, class: "btn btn-primary"%>
<br />
<br />

<table class="table table-bordered table-striped">
    <thead>
        <tr>
            <th>Name</th>
            <th>Download Link</th>
            <th>View</th>
            <th>Delete</th>

        </tr>   
    </thead>
    <tbody>
        <% @resumes.each do|resume| %>
        <tr>
            <td><%= resume.name%></td>
            <td><%= link_to "Download Resume", resume.attachment_url %></td>
            <td><%= link_to "View                  "%></td>
            <td><%= button_to "Delete", resume, method: :delete, class: "btn btn-danger", confirm: "Are you sure to delete #{resume.name}?" %></td>

        </tr>

      <% end %>
    </tbody>

</table>

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