How to Unzip a File in Ruby on Rails

How to unzip a file in Ruby on Rails?

I'd use the rubyzip gem. Specifically this part: https://github.com/rubyzip/rubyzip/blob/master/lib/zip/filesystem.rb

It creates an artificial file system in memory mirroring the contents of the zip file. Here's an example based of the example from the docs:

Rubyzip interface changed!!! No need to do require "zip/zip" and Zip prefix in class names removed.

require 'zip'

Zip::File.open("my.zip") do |zipfile|
  zipfile.each do |file|
    # do something with file
  end
end

In your case, just put the name of the uploaded tempfile where my.zip is in the example, and you can loop through the contents and do your regular operations on them.

How to unzip a zip file containing folders and files in rails, while keeping the directory structure

This worked for me. Gave the same result as you would expect when unzipping a zipped folder with subfolders and files.

Zip::Zip.open(file_path) do |zip_file|
  zip_file.each do |f|
    f_path = File.join("destination_path", f.name)
    FileUtils.mkdir_p(File.dirname(f_path))
    zip_file.extract(f, f_path) unless File.exist?(f_path)
  end
end

The solution from this site:
http://bytes.com/topic/ruby/answers/862663-unzipping-file-upload-ruby

How to unzip a file with ruby

The problem with installing the gem that way is that you're shelling out to another process with:

`gem install rubyzip`

and after that finishes installing the gem, your current irb session still won't see it. You'd have to reload irb with exec "irb" and then calling require 'zip' again.

Note: those are backticks not single quotes.

Try this:

begin
    require 'zip'
rescue LoadError
    `gem install rubyzip`
    exec "irb"
    retry
end

For me require 'zip' works. I have rubyzip-1.1.2

Now you should be able to use Zip

Also, the gem command is rubygems. So you can't install rubygems with itself. It should already be installed, but if not try this: http://rubygems.org/pages/download

Ruby: Download zip file and extract

I found the solution myself and then at stackoverflow :D (How to iterate through an in-memory zip file in Ruby)

input = HTTParty.get("http://example.com/somedata.zip").body
Zip::InputStream.open(StringIO.new(input)) do |io|
  while entry = io.get_next_entry
    puts entry.name
    parse_zip_content io.read
  end
end

1. Download your ZIP file, I'm using HTTParty for this (but you could also use ruby's open command (require 'open-uri').
2. Convert it into a StringIO stream using StringIO.new(input)
3. Iterate over every entry inside the ZIP archive using io.get_next_entry (it returns an instance of Entry)
4. With io.read you get the content, and with entry.name you get the filename.

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