Ruby ethereum

Note: If class of given name exist it will be undefined first to avoid name collision. Get contract from blockchain The other way to obtain a contract instance is to get one that already exists on the blockchain. To do so you need a contract name, contract address and ABI definition. Note that no transaction need to be send to the network as method is read-only. Receiving Contract Events Using the example smart contract described above, one can listen for LogRegister events by using filters.

Default client communicate via IPC. If you want to create custom client or use multiple clients you can create them yourself. The interface only allows calls with smart contract methods. The client-side application needs to know the address of smart contract in blockchain. Ok… so why does this tutorial show how to connect blockchain with Ruby on Rails?

Why we do it? The only difference is that bank is a trusted institution, it adds a sense of responsibility to your transactions. Creating an application In this tutorial, we will create a lunch voting application. Users can only vote once and see results.

Each user is obliged to have an account on blockchain a wallet. First, we need to make some preparations before we start coding. To test and set up our application, we start node on our machine. I chose Parity because it is supported by ethereum. At the ethereum.

Then visit localhost you should see the parity interface. We will need two wallets for both admin and user account. You can create it using the parity interface. To get your private key go to account manager, choose the account and click Export. Please store your private key in a safe place!

After setting up the environment, create a smart contract which is the core of every decentralized, blockchain application. Also you can find documentation for Solidity with examples on official Ethereum site. It also contains a list of available meals and user, both are set in a constructor. Additionally, we will use eth gem, which helps to build and sign ethereum transactions. So add following lines to your Gemfile and run bundle install. Remember to create an admin user, you could add the field admin to your model and set it as true in the console.

The voting model will store information about created votes: the address of deployed smart contract and the meals we can choose during voting. Between the User and Voting there is a many-to-many relation: many users can take part in many votings. Therefore, when an admin creates a vote, he needs to choose users and meals upfront.

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