Create zip from paperclip attachments and download

Question

Trying to create a zip file containing many pictures, my code is as follows:

       compressed_filestream = Zip::OutputStream.write_buffer do |zos|
      @pictures.each do |p|
        image_url = p.picturefile.url(:original)
        zos.put_next_entry p.picturefile_file_name
        zos.print(URI.parse(image_url))    
      end
    end
    compressed_filestream.rewind
    send_data compressed_filestream.read, filename: "pictures.zip"

This creates a pictures.zip file, but it only contains the text-url of each image instead of the actual image...

Try to read the file and then write to zip. `Paperclip.io_adapters.for(p.picturefile).read`. — coderhs, Dec 19 '17 at 15:34

score 4 · Accepted Answer · answered Dec 19 '17 at 15:38

4

Right now you are just passing the URL of the image to the file. What you need to do is pass in the row contents to it.

compressed_filestream = Zip::OutputStream.write_buffer do |zos|
  @pictures.each do |p|
    zos.put_next_entry p.picturefile_file_name
    zos.print(Paperclip.io_adapters.for(p.picturefile).read)    
  end
end
compressed_filestream.rewind
send_data compressed_filestream.read, filename: "pictures.zip"

answered Dec 19 '17 at 15:38

coderhs

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what should I do if i need to provide a url to download this zip? – Abhinay Apr 16 '18 at 10:50

score 0 · Answer 2 · answered Apr 17 '18 at 04:43

Adding to the solution provided above,

In case you want to save it locally and provide path to download this zip file at later point or through API

compressed_filestream = Zip::OutputStream.write_buffer do |zos|
  @pictures.each do |pic|
    zos.put_next_entry pic.upload_file_name
    zos.write(Paperclip.io_adapters.for(pic.upload.url).read)
  end
end
File.open("#{Rails.root}/public/system/#{file_name}", 'wb') { |f| f.write(compressed_filestream.string) }

Create zip from paperclip attachments and download

2 Answers2