Using Rubyzip to Add Files and Nested Directories to a Zipoutputstream

Subdirectories in Zip file using ZipOutputStream

Figured out the answer, thought I would put it here for search engines to find.

Anyway, the link I posted used

zos.put_next_entry("some-funny-name.jpg")

to add files to the zip file. Turns out, that string parameter isn't just a filename, it can be a path as well! So using

zos.put_next_entry("some-random-folder/some-funny-name.jpg")

Will make your zip file contain a folder called 'some-random-folder', with a file called 'some-funny-name.jpg'.

Opening a multipart/form-data ZIP file with rubyzip

Using

Zip::ZipFile.open(params["zip_file"].path) do |zip_file|
 ...
end

should work.

rubyzip error when generating zips of images on the fly : End-of-central-directory signature not found

Got it!

It's because Rails 3 defaults to using x_sendfile, which the server isn't setup for.

Nothing to do with zips at all in the end, it's simply file sending. This post explains everything;

Rails sends 0 byte files using send_file

rubyzip coaching

whatever comes inside ||, considered to be the parameters for the anonymous method (or lambda expression) that comes next,

for ex:

  (1..3).each do |n|
       puts n
  end

can be rewritten as

  (1..3).each {|n| puts n}

|n| could be anything, just a name for a variable.

Generate files and download as zip using RubyZip

You should need to close and unlink the zip file like so:

require('zip')

class SomeController < ApplicationController
  # ...

  def bulk_download
    filename = 'my_archive.zip'
    temp_file = Tempfile.new(filename)

    begin
      Zip::OutputStream.open(temp_file) { |zos| }

      Zip::File.open(temp_file.path, Zip::File::CREATE) do |zip|
        Attachment.all.each do |attachment|
          image_file = Tempfile.new("#{attachment.created_at.in_time_zone}.png")
          image_file.write(attachment.image_string)
          zipfile.add("#{attachment.created_at.in_time_zone}.png", image_file.path)
        end
      end

      zip_data = File.read(temp_file.path)
      send_data(zip_data, type: 'application/zip', disposition: 'attachment', filename: filename)
    ensure # important steps below
      temp_file.close
      temp_file.unlink
    end
  end
end

Here is a good blog post that I used as the source for this code: https://thinkingeek.com/2013/11/15/create-temporary-zip-file-send-response-rails/

Also, it's good practice to keep all your library requirements at the top of the file (i.e. require('zip')).

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