Exporting CSV and Excel

config/application.rb

require 'csv'

index.html.erb

<p>
    Download:
    <%= link_to 'CSV',  products_path(format: "csv") %>
    <%= Link_to 'Excel', products_path(format: "xls") %>
</p>

products_controller.rb

def index
    @products = Product
 
.all #可以使用select等進行篩選
    respond_to do |format|
        format.html
        format.csv { send_data @products.to_csv }
        format.csv { send_data @products.to_xls }
    end
end

modle/product.rb

def self.to_csv(options = {})
    CSV.generate(options) do |csv|
        csv << column_names #column_names是由資料庫表的所有列名組成的陣列，可自定義陣列代替，以便查詢匯出資料
 

        all.each do |product|
            csv << product.attributes.values_at(*column_names)
        end
    end
end

config/initializers/mime_type.rb

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

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>

原文地址