Deploy contract on EthereumJS TestRPC

Question

Following https://medium.com/@mvmurthy/full-stack-hello-world-voting-ethereum-dapp-tutorial-part-1-40d2d0d807c2

I've tried to create an instance of a contract using: VotingContract = web3.eth.contract(abiDefinition) but I get: TypeError: web3.eth.contract is not a function So I've tried: VotingContract = new web3.eth.Contract(abiDefinition) as suggested here: web3.eth.contract is not a function when making contract

But then when I try to deploy the contract on my test blockchaing (launched with EthereumJS TestRPC) I get the following:

deployedContract = VotingContract.new(['Rama','Nick','Jose'],{data: byteCode, from: web3.eth.accounts[0], gas: 4700000})
TypeError: VotingContract.new is not a function
    at repl:1:38
    at ContextifyScript.Script.runInThisContext (vm.js:44:33)
    at REPLServer.defaultEval (repl.js:239:29)
    at bound (domain.js:301:14)
    at REPLServer.runBound [as eval] (domain.js:314:12)
    at REPLServer.onLine (repl.js:433:10)
    at emitOne (events.js:120:20)
    at REPLServer.emit (events.js:210:7)
    at REPLServer.Interface._onLine (readline.js:278:10)
    at REPLServer.Interface._line (readline.js:625:8)
    at REPLServer.Interface._ttyWrite (readline.js:905:14)
    at REPLServer.self._ttyWrite (repl.js:502:7)
    at ReadStream.onkeypress (readline.js:157:10)
    at emitTwo (events.js:125:13)
    at ReadStream.emit (events.js:213:7)
    at emitKeys (internal/readline.js:420:14)
    at emitKeys.next (<anonymous>)
    at ReadStream.onData (readline.js:1006:36)
    at emitOne (events.js:115:13)
    at ReadStream.emit (events.js:210:7)
    at addChunk (_stream_readable.js:252:12)
    at readableAddChunk (_stream_readable.js:239:11)
    at ReadStream.Readable.push (_stream_readable.js:197:10)
    at TTY.onread (net.js:589:20)

Any suggestions?

Answer 1

The API for the web3.js v1.0 changed. The tutorial is using the web3 api v0.x.x. Thus, you must either update your node to use the proper API

npm install ethereumjs-testrpc web3@0.20.1

or, you must update the code to use the v1.0 implementation. I.E:

web3.eth.getAccounts(console.log);

You can also refer to the github from mjhm who did a great job converting the tutorial code to v.1.0. https://github.com/mjhm/hello_world_dapp

Answer 2

Use VotingContract = new web3.eth.Contract(abiDefinition). Worked for me.

Answer 3

You have to use the deploy function as shown in web3.js docs: https://web3js.readthedocs.io/en/1.0/web3-eth-contract.html#deploy as well as the asciiToHex utility function.

Prior to initializing the contract instance, type the following into your node console:

// to use the asciiToHex utility function
asciiToHex = Web3.utils.asciiToHex;

// put array of candidates into a variable
candidates = ['Rama', 'Nick', 'Jose'];

// set first test account testrpc created into account variable
web3.eth.getAccounts().then((accounts) => { account = accounts[0] });

Deploy the contract to the blockchain.

VotingContract.deploy({data: byteCode, arguments: [candidates.map(asciiToHex)]}).send({from: account, gas: 4700000}).then((result) => {deployedContract = result});

deployedContract is now the instance of the contract. You can check this by typing deployedContract.options.address into your node console.