Lesson 7 : Error: ERROR processing /root/hh-fcc/hardhat-fund-me-fcc/deploy/01-deploy-fund-me.js: TypeError: Cannot read properties of undefined (reading 'ethUsdPriceFeed')

[MrPositive0709]

this is my 01-deploy-fund-me.js file :

const { network } = require("hardhat");
const { networkConfig, developmentChain } = require("../helper-hardhat-config");
module.exports = async ({ getNamedAccounts, deployments }) => {
  const { deploy, log } = deployments;
  const { deployer } = await getNamedAccounts();
  const chainId = network.config.chainId;
  console.log(chainId);
  //If chainId is X use address Y
  let ethUsdPriceFeedAddress;
  if (developmentChain.includes(network.name)) {
    const ethUsdAggregator = await deployments.get("MockV3Aggregator");
    ethUsdPriceFeedAddress = networkConfig[chainId]["ethUsdPriceFeed"];
  }

  //If the contract doesn't exist , we deploy a minimum version for our local testing
  // when going for localhost or hardhat network we want to use a mock
  const fundMe = await deploy("FundMe", {
    from: deployer,
    args: [ethUsdPriceFeedAddress], // put price feed address
    log: true,
  });
  log("-------------------------------------");
};

module.exports.tags = ["all", "fundme"];

this is my hardhat-config.js file :

require("dotenv").config();

require("@nomiclabs/hardhat-etherscan");
require("@nomiclabs/hardhat-waffle");
require("hardhat-gas-reporter");
require("solidity-coverage");
require("hardhat-deploy");
// This is a sample Hardhat task. To learn how to create your own go to
// https://hardhat.org/guides/create-task.html
task("accounts", "Prints the list of accounts", async (taskArgs, hre) => {
  const accounts = await hre.ethers.getSigners();

  for (const account of accounts) {
    console.log(account.address);
  }
});

const COINMARKETCAP_API_KEY = process.env.COINMARKETCAP_API_KEY || "";
const SEPOLIA_RPC_URL =
  process.env.SEPOLIA_RPC_URL ||
  "https://eth-sepolia.g.alchemy.com/v2/YOUR-API-KEY";
const PRIVATE_KEY =
  process.env.PRIVATE_KEY ||
  "0x11ee3108a03081fe260ecdc106554d09d9d1209bcafd46942b10e02943effc4a";
const ETHERSCAN_API_KEY = process.env.ETHERSCAN_API_KEY || "";
// You need to export an object to set up your config
// Go to https://hardhat.org/config/ to learn more

/**
 * @type import('hardhat/config').HardhatUserConfig
 */
module.exports = {
  defaultNetwork: "hardhat",
  solidity: "0.8.18",
  networks: {
    hardhat: {
      chainId: 31337,
      // gasPrice: 130000000000,
    },
    sepolia: {
      url: SEPOLIA_RPC_URL,
      accounts: [PRIVATE_KEY],
      chainId: 11155111,
      blockConfirmations: 6,
    },
  },
  gasReporter: {
    enabled: process.env.REPORT_GAS !== undefined,
    currency: "USD",
  },
  etherscan: {
    apiKey: process.env.ETHERSCAN_API_KEY,
  },
  namedAccounts: {
    deployer: {
      default: 0, // here this will by default take the first account as deployer
    },
  },
};

and this is helper-hardhat-config.js :

const networkConfig = {
  11155111: {
    name: "sepolia",
    ethUsdPriceFeed: "0x694AA1769357215DE4FAC081bf1f309aDC325306",
  },
};

const developmentChain = ["hardhat", "localhost"];
const DECIMALS = 8;
const INITIAL_ANSWER = 200000000000;
module.exports = {
  networkConfig,
  developmentChain,
  DECIMALS,
  INITIAL_ANSWER,
};

after deploy the 01-deploy-fund-me.js it returns me this bug :

Error: ERROR processing /root/hh-fcc/hardhat-fund-me-fcc/deploy/01-deploy-fund-me.js:
TypeError: Cannot read properties of undefined (reading 'ethUsdPriceFeed')

[alymurtazamemon]

@MrPositive0709 Because the code is not able to read ethUsdPriceFeed because it is not defined for localhost in config file, you are missing this logic.

let ethUsdPriceFeedAddress
if (chainId == 31337) {
    const ethUsdAggregator = await deployments.get("MockV3Aggregator")
    ethUsdPriceFeedAddress = ethUsdAggregator.address
} else {
    ethUsdPriceFeedAddress = networkConfig[chainId]["ethUsdPriceFeed"]
}

If the user deploying on local host then take the address from mocks otherwise from the networkConfig

[MrPositive0709]

Many thanks to you but I haven't fixed this yet
Can you explain more clearly about how your code work ?
after replacing mine with your code it returns another bug :
Error: ERROR processing /root/hh-fcc/hardhat-fund-me-fcc/deploy/01-deploy-fund-me.js:
Error: No deployment found for: MockV3Aggregator