使用gem回形针下载文件

Question

I want to understand how to download file using Paperclip. I upload file to local storage.

It's Model:

class AFile < ActiveRecord::Base
  has_attached_file :attach,
  :url => "public/attach/:basename.:extension",
  :path => ":rails_root/public/attach/:basename.:extension"
  validates_attachment_content_type :attach, content_type: "text/plain"
end

It's View show.html.erb :

<p>
  <strong>AFile:</strong>
  <%= @afile.name_file %>
</p>

<%= link_to 'Download', @afile.attach.url(:original, false) %> |
<%= link_to 'Edit', edit_afile_path(@afile) %> |
<%= link_to 'Back', afiles_path %>

I did like this: File download using Paperclip but it did not help.

But when i click on the Download, then an error: No route matches [GET] "/public/attach/text.txt"

How to solve this problem? Why file cannot be downloaded by clicking "Download"?

Answer 1

Rails places the /public directory in the servers web root. So a file with the file system path /public/foo.txt will be accessible at http://localhost:3000/foo.txt - not http://localhost:3000/public/foo.txt .

So you need to change url option for the attached file:

class AFile < ActiveRecord::Base
  has_attached_file :attach,
  :url => "/attach/:basename.:extension",
  :path => ":rails_root/public/attach/:basename.:extension"
  validates_attachment_content_type :attach, content_type: "text/plain"
end

Answer 2

My solution to download file is something like :

<%= link_to 'Download', @afile.attach.url(:original),
    download: @afile.attach.url(:original)%>