如何更改我的.xls.erb文件以为每行创建新工作表？

Question

我正在关注Exporting CSV and Excel的RailsCast教程。我的目标是出口到excel。一切都工作得很好，除了我希望每个产品都有它的表格。下面是每个教程的代码，然后我尝试调整我的需求。

/config/application.rb

require File.expand_path('../boot', __FILE__)

require 'csv'
require 'rails/all'

/config/initializers/mime_types.rb

Mime::Type.register "application/xls", :xls

/app/models/product.rb

class Product < ActiveRecord::Base
  attr_accessible :name, :price, :released_on

  def self.to_csv(options = {})
    CSV.generate(options) do |csv|
      csv << column_names
      all.each do |product|
        csv << product.attributes.values_at(*column_names)
      end
    end
  end
end

应用/控制器/ products.rb

class ProductsController < ApplicationController
  def index
    @products = Product.order(:name)
    respond_to do |format|
      format.html
      format.csv { send_data @products.to_csv }
      format.xls
    end
  end
end

/app/views/products/index.xls.erb

<?xml version="1.0"?>
<Workbook xmlns="urn:schemas-microsoft-com:office:spreadsheet"
  xmlns:o="urn:schemas-microsoft-com:office:office"
  xmlns:x="urn:schemas-microsoft-com:office:excel"
  xmlns:ss="urn:schemas-microsoft-com:office:spreadsheet"
  xmlns:html="http://www.w3.org/TR/REC-html40">
  <Worksheet ss:Name="Sheet1">
    <Table>
      <Row>
        <Cell><Data ss:Type="String">ID</Data></Cell>
        <Cell><Data ss:Type="String">Name</Data></Cell>
        <Cell><Data ss:Type="String">Release Date</Data></Cell>
        <Cell><Data ss:Type="String">Price</Data></Cell>
      </Row>
    <% @products.each do |product| %>
      <Row>
        <Cell><Data ss:Type="Number"><%= product.id %></Data></Cell>
        <Cell><Data ss:Type="String"><%= product.name %></Data></Cell>
        <Cell><Data ss:Type="String"><%= product.released_on %></Data></Cell>
        <Cell><Data ss:Type="Number"><%= product.price %></Data></Cell>
      </Row>
    <% end %>
    </Table>
  </Worksheet>
</Workbook>

所有这一切都可以创建一个带有一列Products和其他属性列的Excel工作表。为了尝试为每个产品创建单独的工作表，我在.xls.erb中的元素上方迭代了Products。这导致excel文件无法读取。

/app/views/products/index.xls.erb

<?xml version="1.0"?>
<Workbook xmlns="urn:schemas-microsoft-com:office:spreadsheet"
  xmlns:o="urn:schemas-microsoft-com:office:office"
  xmlns:x="urn:schemas-microsoft-com:office:excel"
  xmlns:ss="urn:schemas-microsoft-com:office:spreadsheet"
  xmlns:html="http://www.w3.org/TR/REC-html40">
 <% @products.each do |product| %>
  <Worksheet ss:Name="Sheet1">
    <Table>
      <Row>
        <Cell><Data ss:Type="String">ID</Data></Cell>
        <Cell><Data ss:Type="String">Name</Data></Cell>
        <Cell><Data ss:Type="String">Release Date</Data></Cell>
        <Cell><Data ss:Type="String">Price</Data></Cell>
      </Row>
      <Row>
        <Cell><Data ss:Type="Number"><%= product.id %></Data></Cell>
        <Cell><Data ss:Type="String"><%= product.name %></Data></Cell>
        <Cell><Data ss:Type="String"><%= product.released_on %></Data></Cell>
        <Cell><Data ss:Type="Number"><%= product.price %></Data></Cell>
      </Row>
    </Table>
  </Worksheet>
 <% end %>
</Workbook>

如何更改我的.xls.erb文件以为每个产品行创建新工作表？