Rails下载文件的三种方法

Solution 1

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

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


class ApplicationController < ActionController::Base   
     before_filter :set_headers  
  
     private
     def set_headers       
       @headers["Content-Type"] = "text/csv"       
       @headers["Content-disposition"] = 'attachment; filename="the_file.csv"'     
   end 
end


自定义HTTP响应页头，HTTP response header
  def add_headers
    response.headers['test-controller-header'] = 'test-controller-header-value'
  end


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

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

Solution 2

There is an easier way to do this with the HTML5 download attribute.

<%= link_to 'Download existing avatar', @user.avatar(:original), download: "User_#{@user.id}_avatar" %>

Solution 3

Instead of putting the link of the image in your tag, you can handle it in your controller. And then in your controller you can do something like

send_file @download.wallpapers[1].wallpaper.url, :type => 'image/jpeg', :disposition => 'attachment'

https://9to5answer.com/rails-39-link_to-39-to-download-an-image-immediately-instead-of-opening-it-in-the-browser

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