Rails'link_to'立即下载图像，而不是在浏览器中打开它 [英] Rails 'link_to' to Download An Image Immediately Instead of Opening it in the Browser

问题描述

我有一个link_to Rails帮助器，当点击时下载壁纸。但图像正在浏览器中加载，而不是立即下载。

I have a link_to Rails helper that downloads a wallpaper when clicked. But the image is loading in the browser instead of being downloaded immediately.

<%= link_to "1920x1080", @download.wallpapers[1].wallpaper.url %>

但是同时我有一个link_to Rails帮助器下载.exe格式的屏幕保护程序，但在这里它的工作原理是：文件正在下载。

But at the same time I have a link_to Rails helper that downloads a screensaver of .exe format but here it works as inteded: file being downloaded immediately.

<%= link_to "720p", @download.screensavers.first.screensaver.url %>

我应该添加或执行这些操作，以使图像不会在浏览器中打开，而是下载立即？

What should I add or do so that the images will not be opened in the browser but instead be downloaded immediately?

谢谢！

推荐答案

一般来说，这样做是在发送图像时设置相应的标题：

Generally, the cleanest way to do this is to set the appropriate header when sending the image:

Content-Disposition: attachment; filename=<file name.ext>

如果从文件系统提供文件，send_file方法将允许您适当地设置此标题：

The send_file method will allow you to set this header appropriately if you're serving the file from the filesystem:

http://api.rubyonrails.org/classes/ActionController/Streaming.html#method-i-send_file

如果文件存储在您的数据库，可以使用send_data：

If the file is stored in your database, you can use send_data instead:

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

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