We could not find a gem to use in our rails environment and we needed to interact with the Zendesk REST API from http://upsido.com to Zendesk. By creating tickets from our RubyOnRails environment etc..
So here it is the Ruby wrapper for Zendesk REST API
Quick install: gem install zendesk-api
Its not perfect yet but hopefully the zendesk community will contribute and enhance it.
current version 0.2.0