如何在Rails应用程序中发送动态生成的文件 [英] How to send a dynamically generated file in a rails app

问题描述

我正在尝试在Rails应用程序中提供动态生成的文件，因此当用户单击特定链接时，将使用send_data生成文件并将其发送到客户端。

该文件不打算重用：是一个短文本文件，并且重新生成应该是真正便宜的，因为它不会被大量下载。但是，如果有必要或方便的话，我可以将其存储在数据库中，这样只会生成一次。

首先，我想在内存中生成文件并将其发送在控制器中。我正在尝试归档以下内容：

  def DownloadsController< ApplicationController 
 def project_file 
 project = Project.find（params [：id]）
 send_data project.generate_really_simply_text_file_report 
 end 
 end 
  

但是我不知道如何在内存中生成流，因此在文件系统中没有文件创建。

另一种选择是在rails app tmp目录中生成一个具有随机名称的文件，然后从ther发送该文件，但是该文件将保留在该文件中，这是我不希望发生的事情

编辑：如果我没记错的话，send_file会阻止请愿书，直到文件被发送出去，这样才可以正常工作。

还有其他建议或意见吗？

预先感谢

解决方案

如果您所描述的是一个简单的问题，则可以使用类似的简单解决方案。只是不要忘记：filename 选项，否则文件将被命名为 project_file。

  def project_file 
 project = Project.find（params [：id]）
 send_data project.generate_really_simply_text_file_report，：filename => ＃{project.name} .txt 
结尾
  

编辑：

您的 project＃generate_really_simply_text_file_report 应该返回二进制数据，文件路径或原始数据

  def下载
 content =块状培根\牛尼斯 
 send_data内容，：filename =>  bacon.txt 
结束
  

I'm trying to serve a dynamically generated files in a rails app, so when the user clicks a specific link, the file is generated and sent to the client using send_data.

The file is not intended to be reused: is a short text file and regenerating should be really inexpensive as it won't be donwloaded that much; but if it is necessary or convenient I could store it in the database so is only generated once.

First, I would like to generate the file in memory, and send it in the controller. I'm trying to archive something like this:

def DownloadsController < ApplicationController
  def project_file
    project = Project.find(params[:id])
    send_data project.generate_really_simply_text_file_report
  end
end

But i don't know how to generate a stream in memory, so no file is created in the file system.

Another option would be generating the file with a random name in the rails app tmp directory and send it from ther, but then the file will be kept there, which is something I would prefer not to happen.

Edit: If I'm not mistaken, send_file blocks the petition until the file is sent, so it could work...

Any other advices or opinions?

Thanks in advance

解决方案

If it's a simple problem as you describe it, a simple solution like that will do. Just don't forget the :filename option, otherwise the file will be named as "project_file".

  def project_file
    project = Project.find(params[:id])
    send_data project.generate_really_simply_text_file_report, :filename => "#{project.name}.txt"
  end

Edit:

your project#generate_really_simply_text_file_report should return either the binary data, the path for the file or a raw String.

  def download
    content = "chunky bacon\r\nis awesome"
    send_data content,  :filename => "bacon.txt" 
  end

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