Answer by arodriguezdonaire for Ethereum and Rails Tutorials

You can find so many tools for using ruby to access the Ethereum Blockchain.

You have for example (like 5chdn♦ said in a comment):

• ethereum-ruby made by DigixGlobal.
• ruby-ethereum made by janx.
• rails-eth-api made by rexmadden.

Also, here you have an Ethereum StackExchange answer which tells about how to connect Geth by IPC on rails.