LESSON 9 => TypeError: Cannot read properties of undefined (reading '0')

[harry2855]

const { network, ethers } = require("hardhat")
const {developmentChains, networkConfig} = require("../helper-hardhat-config")
const {verify} = require("../utils/verify")

const VRF_SUB_FUND_AMOUNT = ethers.parseEther("2")

module.exports = async function ({getNamedAccounts, deployments}) {
    const { deploy, log } = deployments
    const {deployer} = await getNamedAccounts()
    const chainId = network.config.chainId
    let vrfCoordinatorV2Address,subscriptionId

    if(developmentChains.includes(network.name)) {
        const vrfCoordinatorV2Mock = await ethers.getContract("VRFCoordinatorV2Mock")
        vrfCoordinatorV2Address = vrfCoordinatorV2Mock.getAddress
        const transactionResposne = await vrfCoordinatorV2Mock.createSubscription()
        const transactionReceipt = await transactionResposne.wait(1)
        
        subscriptionId = transactionReceipt.events[0].args.subId
        // we have to fund the subsciption
        await vrfCoordinatorV2Mock.fundSubscription(subscriptionId, VRF_SUB_FUND_AMOUNT)
    }else{
        vrfCoordinatorV2Address = networkConfig[chainId]["vrfCoordinatorV2"]
        subscriptionId = networkConfig[chainId]["subscriptionId"]
    }
    const entranceFee = networkConfig[chainId]["entranceFee"]
    const gasLane = networkConfig[chainId]["gasLane"]
    const callbackGasLimit = networkConfig[chainId]["callbackGasLimit"]
    const interval = networkConfig[chainId]["interval"]

    args=[vrfCoordinatorV2Address,entranceFee, gasLane, subscriptionId, callbackGasLimit,interval]
    const raffle = await deploy("Raffle", {
        from : deployer,
        args: args,
        log:true,
        waitConfirmations: network.config.blockConfirmations || 1
    })
    if(!developmentChains.includes(network.name) && process.env.ETHERSCAN_API_KEY) {
        console.log("Verifying")
        await verify(raffle.address, args)
    }
}

module.exports.tags = ["all","raffle"]

This is my deploy code for raffle. Probably the error is in this line.

 subscriptionId = transactionReceipt.events[0].args.subId

[alymurtazamemon]

@harry2855 You can console log the transactionReceipt and see if there is any event or not, because it is saying undefined.

[alymurtazamemon]

@harry2855 Please leave your repository link so I can test it.

[harry2855]

https://github.com/harry2855/hardhatlottery

[harry2855]

Hey @alymurtazamemon , I rolled back to ether v5 but now I am getting following error

TypeError: (0 , ethers_1.getAddress) is not a function

I have commited changes in the repo.

[alymurtazamemon]

@harry2855 No this is not an ethers issue, instead the mock contract response was not emitting the event of subscript created. But we can by pass it because we know it is the first subscript so we can do this

- subscriptionId = transactionReceipt.events[0].args.subId
+ subscriptionId = 1

And also address is know renamed to target vrfCoordinatorV2Address = vrfCoordinatorV2Mock.target;

[harry2855]

I have rolled back to the previous version now and now running into another error. You can check in the thread.

[MohammadRokib]

Try this version of Ethers. I had almost a similar problem. This solved it.

yarn add ethers@5.7.2

[ezescigo]

Rolling back to previous versions of ethers shouldn't be the marked answer guys.

[jeevansiddu]

now in latest version of ethers can someone say how to log the events from transaction receipt ., because in the txn receipt object thre is no events section @alymurtazamemon

[Ahmedborwin]

Hey @alymurtazamemon , I rolled back to ether v5 but now I am getting following error

TypeError: (0 , ethers_1.getAddress) is not a function

I have commited changes in the repo.

Hi @harry2855 - did you ever find a solution to the error: TypeError: (0 , ethers_1.getAddress) is not a function?

[ezescigo]

Have you tried with contract.address?

[MohammadRokib]

I was getting the same error. In my case @nomiclabs/hardhat-ethers was causing the problem. The following version solved it.

@nomiclabs/hardhat-ethers": "npm:hardhat-deploy-ethers@^0.3.0-beta.13

[Ahmedborwin]

hi Mohammed, thank you that seems to have worked.

I wonder why the previous project (i copied the package.json file from the older project) didn't through up the same error?

Anyway, thanks for your help!

I ultimately finished lesson 14 with ethers v6 without reading the SubId from the event triggered. Still struggling to read emitted events using ethers v6. If anyone can point me in the right direction that would be awesome. Thank you!

[yuyangezheng]

Ahmed, have you (or anyone else) found out why the subscription ID is not being emitted in ehters v5?