Lesson 7 Error: No Contract deployed with name MockV3Aggregator

[mafelgo]

While i was following the lessons and tried to run my own object, it always throw this error: No Contract deployed with name MockV3Aggregator when every time I put
yarn hardhat deploy --tags FundMe
here's the error looks like

I searched a lot in discussions or google or smth else, and i tried all the ways they do, but still not work.
what's more, i created a new object and clone patrick's code on git, the error can still occur. But, when i enter this yarn hardhat deploy, it works! Both at my object or the cloned object. The error only occured when I added --tags FundMe.
I dont know whats wrong, maybe there's problem with my computer? can someone help me please? I have no idea what to do

here's my code
01-deploy-fund-me.js

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

module.exports = async ({ getNamedAccounts, deployments }) => {
  const { deploy, log } = deployments;
  const { deployer } = await getNamedAccounts();
  const chainId = network.config.chainId;
  // If chainId is X, use address Y. Or if chainId is Z, use A.

  // const ethUsdPriceFeedAddress = networkConfig[chainID]["ethUsdPriceFeed"];

  let ethUsdPriceFeedAddress;
  if (chainId == 31337) {
    const ethUsdAggregator = await ethers.getContract("MockV3Aggregator");
    ethUsdPriceFeedAddress = ethUsdAggregator.address;
  } else {
    ethUsdPriceFeedAddress = networkConfig[chainId]["ethUsdPriceFeed"];
  }
  log("----------------------------------------------------");
  log("Deploying FundMe and waiting for confirmations...");
  const fundMe = await deploy("FundMe", {
    from: deployer,
    args: [ethUsdPriceFeedAddress],
    log: true,
    waitConfirmations: network.config.blockConfirmations || 1,
  });
  log(`FundMe deployed at ${fundMe.address}`);

  if (
    !developmentChains.includes(network.name) &&
    process.env.ETHERSCAN_API_KEY
  ) {
    await verify(fundMe.address, [ethUsdPriceFeedAddress]);
  }

  log("--------------------------------------------------");
};

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

hardhat.config.js

require("@nomicfoundation/hardhat-toolbox") // https://hardhat.org/hardhat-runner/plugins/nomicfoundation-hardhat-toolbox
require("dotenv").config() //env文件
require("@nomiclabs/hardhat-etherscan") 
require("hardhat-gas-reporter") 
require("solidity-coverage") 
require("hardhat-deploy")

const SEPOLIA_RPC_URL = process.env.SEPOLIA_RPC_URL 
const PRIVATE_KEY = process.env.PRIVATE_KEY
const ETHERSCAN_API_KEY = process.env.ETHERSCAN_API_KEY
const COINMARKETCAP_API_KEY = process.env.COINMARKETCAP_API_KEY

/** @type import('hardhat/config').HardhatUserConfig */
module.exports = {
    networks: {
        // --network <yourNetworkName>
        sepolia: {
            url: SEPOLIA_RPC_URL,
            accounts: [PRIVATE_KEY],
            chainId: 11155111,
            blockConfirmations: 6, 
        },
        //Started HTTP and WebSocket JSON-RPC server at http://127.0.0.1:8545/
        localhost: {
            url: "http://127.0.0.1:8545/",
            chainId: 31337, 
        },
    },
    namedAccounts: {
        deployer: {
            default: 0,
        },
        users: {
            default: 0,
        },
    },
    solidity: "0.8.18",
    etherscan: {
        apiKey: ETHERSCAN_API_KEY,
    },
    gasReporter: {
        enabled: true,
        outputFile: "gasReport.txt", 
        noColors: true, 
        currency: "CNY", 
        coinmarketcap: COINMARKETCAP_API_KEY, // https://pro.coinmarketcap.com/account/
        token: "BNB", //https://www.npmjs.com/package/hardhat-gas-reporter
    },
}

and all the contracts i have are here:

MockV3Aggregator.sol

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.8;
import "@chainlink/contracts/src/v0.8/tests/MockV3Aggregator.sol";

thanks again for help

[paulcoffee85]

At bottom of deploy-fund-me
module.exports.tags = ["all", "FundMe"]; should be small caps "fundme"

default is missing from:
module.exports = async ({ getNamedAccounts, deployments }) => {

Why is DECIMALS & INITIAL_ANSWER in the import section ?

const {
  networkConfig,
  developmentChains,
  DECIMALS,
  INITIAL_ANSWER,
} = require("../helper-hardhat-config");
const { verify } = require("../utils/verify");

[mafelgo]

Thanks for your help again, but I tried just now after adding the default and turning the FundMe into lowercase, it says Nothing to compile and then just done like this:

[mafelgo]

By the way, the DECIMALS & INITIAL_ANSWER was copied from last object, just ignore that, I frogot to delete it.

[paulcoffee85]

Ok, but your files are working with : yarn hardhat deploy ?

[mafelgo]

that's what exactly Im facing right now, it that being normal?
Actually I was ignoring that and kept learning so, but then that problem appears again when i tried to test it with yarn hardhat test.
As I searched many discussions about this, all the problems seem to focus on this line:

const ethUsdAggregator = await ethers.getContract("MockV3Aggregator")

then, here's my FundMe.test.js

const { assert } = require("chai")
const { deployments, ethers, getNamedAccounts } = require("hardhat")
describe("FundMe", async function () {
    let fundMe
    let deployer
    let mockV3Aggregator
    beforeEach(async function () {
        // const accounts = await ethers.getSigners();
        // const accountZero = accounts[0]; 
        deployer = (await getNamedAccounts()).deployer
        console.log(deployer)
        await deployments.fixture(["all"]) 
        mockV3Aggregator = await ethers.getContract(
            "MockV3Aggregator",
            deployer
        )
        fundMe = await ethers.getContract("FundMe", deployer)
    })
    describe("constructor", async function () {
        it("sets the aggregator addresses correctly", async function () {
            const response = await fundMe.priceFeed()
            assert.equal(response, mockV3Aggregator.address)
        })
    })
})

when I tried to test it, it throws the error:Error: No Contract deployed with name fundme
and i found it that the error comes from this line( I tried to update the "FundMe" into lowercase, but still that error):

fundMe = await ethers.getContract("FundMe", deployer)

So I just wonder if this error is related to the previous one since these look similar, that's why I go back and check the deploy

[mafelgo]

I guess the original issue was resolved adding default to module.exports. If you could mark as answered and than start new thread for the tags questions. Which got me down a rabbit hole. I'm reluctant to find the resolve to why 01-deploy-fund-me.js isn't deploying on --tags fundme.

Alright, thanks a lot again

[paulcoffee85]

Yes. I tested the project from course repo on github and get the exact same results as we're getting. And the default was also missing from course repo. So long story short. Patrick implements the tags but doesn't illustrate the tags in the deploy files, which don't deploy the 01-deploy-fund-me.js file anyway.
Thanks

[paulcoffee85]

@mafelgo Here's kind of rundown of the "fundme" tag , hope it makes sense.

The command yarn hardhat deploy --tags fundMe throws an error because it doesn't specify which network to deploy to.

When deploying a contract using Hardhat, you need to specify which network to deploy to using the --network flag. If you don't specify a network, Hardhat will default to the localhost network.

In this case, the FundMe contract requires a price feed address, which is obtained from the networkConfig object based on the chainId of the current network. If you don't specify a network, the code will try to read the price feed address from the networkConfig object based on the chainId of the localhost network, which is unlikely to exist in the object.

Therefore, to deploy the contract using the yarn hardhat deploy --tags fundMe command, you need to specify which network to deploy to using the --network flag. For example, yarn hardhat deploy --network goerli --tags fundMe will deploy the FundMe contract on the goerli network.

[mafelgo]

It works! Amazing! It explains the matter. Thanks for all your help! :D