Today I’m going to share how you can let your app accept zip files which will then be extracted into multiple attachments. If you already use Attachment Fu to manage files, this should be super easy to add.
Before my controller had something like this:
Attachment.create(:uploaded_data => params[:Filedata])
First break that up into something more like this:
attachment = Attachment.new attachment.uploaded_data = params[:Filedata] attachment.save
Then put in some split logic for if it’s a zip file:
attachment = Attachment.new attachment.uploaded_data = params[:Filedata] if attachment.content_type == "application/zip" # Unzip this and process all the inner files Attachment.build_from_zip(attachment) else attachment.save end
Now we’ll need the RubyZip gem and MIME Types gem, so do:
sudo gem install rubyzip sudo gem install mime-types
Now in the
Attachment class we’ll add the
def self.build_from_zip(ss) zipfile = Zip::ZipFile.open(ss.temp_path) zipfile.each do |entry| if entry.directory? next elsif entry.name.include?("/") next else screen = Attachment.new screen.filename = entry.name screen.temp_data = zipfile.read(entry.name) mime = MIME::Types.type_for(entry.name) screen.content_type = mime.content_type unless mime.blank? screen.save end end end
The only two non-obvious things to note here are:
- I skip the files with / in them because when I archive files on my machine, hidden files with / characters in them make it into the archive. I only want the real files.
- I use the MIME Types gem to decide the content type from the filename.
I hope you find this helpful, enjoy!