动态创建文件并下载到用户的计算机上

I'm wondering if it's possible to do this in Rails:

我想知道是否可以在Rails中执行此操作：

Have a link on the webpage. When the user clicks on the link, the controller generates a file dynamically (say, a text file that contains a single random number between 1 and 10), and the file is downloaded onto the user's computer. The file might be temporarily stored on the server, but it shouldn't be permanently there.

在网页上有一个链接。当用户点击链接时，控制器动态生成文件（例如，包含1到10之间的单个随机数的文本文件），并将文件下载到用户的计算机上。该文件可能暂时存储在服务器上，但不应永久存储在服务器上。

2 个解决方案

#1

Use send_data in the controller:

在控制器中使用send_data：

send_data("4", :filename => "my_awesome_file")

If you already have the file on the server, you can use send_file instead

如果您已在服务器上拥有该文件，则可以使用send_file

send_file(filepath, :filename => "my_awesome_file")

http://api.rubyonrails.org/classes/ActionController/DataStreaming.html#method-i-send_data

#2

Yes, it's possible. This is what I have in one of my apps:

是的，这是可能的。这就是我在其中一个应用中所拥有的：

class DownloadsController < ApplicationController

  def download
    # ...
    send_file CSVConstructor::Constructor.new(...).to_zip 
  end

end

The download action takes params submitted from a form and sends them to a custom class that generates a few files, packages them as a zip, and returns the file path. You'll have to figure out the best way to generate files for your own app, but I would recommend something similar - branching the functionality into a separate class helps keep your controller light.

下载操作从表单提交params并将它们发送到生成一些文件的自定义类，将它们打包为zip，然后返回文件路径。你必须找出为你自己的应用程序生成文件的最佳方法，但我会推荐类似的东西 - 将功能分成一个单独的类有助于保持你的控制器轻。

#1