Lesson 7: ethers.getContract is not a function

[SamiMansuri]

I'm testing FundMe.test.js but its gives me error

PS C:\Users\SAMI\hh_fcc\test> yarn hardhat test
yarn run v1.22.19
$ C:\Users\SAMI\hh_fcc\test\node_modules\.bin\hardhat test


  FundMe
    constructor
      1) "before each" hook for "sets the aggregator addresses correctly"


  0 passing (2s)
  1 failing

  1) FundMe
       "before each" hook for "sets the aggregator addresses correctly":
     TypeError: ethers.getContract is not a function
      at Context.<anonymous> (test\unit\FundMe.test.js:10:27)
      at processTicksAndRejections (node:internal/process/task_queues:96:5)
      at runNextTicks (node:internal/process/task_queues:65:3)
      at listOnTimeout (node:internal/timers:528:9)
      at processTimers (node:internal/timers:502:7)



error Command failed with exit code 1.

here FundMe.test.js file:

const { deployments, getNamedAccounts, ethers } = require("hardhat");
const { assert } = require("chai");

describe("FundMe", function () {
  let fundMe;
  let MockV3Aggregator;
  let deployer;
  beforeEach(async function () {
    deployer = (await getNamedAccounts()).deployer;
    await deployments.fixture(["all"]);
    fundMe = await ethers.getContract("FundMe", deployer);
    MockV3Aggregator = await ethers.getContract("MockV3Aggregator", deployer);
  });

  describe("constructor", function () {
    it("sets the aggregator addresses correctly", async () => {
      const response = await fundMe.getPriceFeed();
      assert.equal(response, mockV3Aggregator.address);
    });
  });
});

[Rishi860]

Can you make a repo of your code and share the link here?
PS: your test file is fine

[alymurtazamemon]

@Drakenn04 I think you are using a newer version of hardhat, try getContractAt method.

[SamiMansuri]

Okay 👍🏼

[TimeKeyRoll]

Hi @alymurtazamemon I have the same issue and could you help me to know what are the conflicts of dependencies because i want to fix it while understanding the error. THANKYOU.

[alymurtazamemon]

@MasterofBlockchain Ok, I am working on someone's issue right now, please create a new discussion and leave your repo link there and tag me there.

[TimeKeyRoll]

Okay I will paste the code there. I don't have the repo. And i will tag you as well. APPRECIATED.

[MahzyarSaadat]

@alymurtazamemon
what's the problem of this section , i knowed every consept of this section , but every time when i try to write test i occur this error .

[krakxn]

Show hardhat config

[SamiMansuri]

require("@nomicfoundation/hardhat-toolbox");
require("@nomiclabs/hardhat-ethers");
require("dotenv").config();
require("hardhat-deploy");

/** @type import('hardhat/config').HardhatUserConfig */

const POLYGON_RPC_URL = process.env.POLYGON_RPC_URL;
const GOERLI_RPC_URL = process.env.GOERLI_RPC_URL;
const PRIVATE_KEY = process.env.PRIVATE_KEY;
const ETHERSCAN_API_KEY = process.env.ETHERSCAN_API_KEY;
const RINKEBY_RPC_URL = process.env.RINKEBY_RPC_URL;

module.exports = {
  solidity: {
    compilers: [{ version: "0.8.9" }, { version: "0.6.6" }],
  },
  defaultNetwork: "hardhat",

  networks: {
    goerli: {
      url: GOERLI_RPC_URL,
      accounts: [PRIVATE_KEY],
      chainId: 5,
      blockConfirmations: 6,
    },
    polygon: {
      url: POLYGON_RPC_URL,
      accounts: [PRIVATE_KEY],
      chainId: 137,
      blockConfirmations: 6,
    },
    rinkeby:{
      url: RINKEBY_RPC_URL,
      accounts: [PRIVATE_KEY],
      chainId: 4,
      blockConfirmations:6,
    },
    localhost: {
      url: "http://127.0.0.1:8545/",
      chainId: 31337,
    },
  },

  etherscan: {
    apiKey: ETHERSCAN_API_KEY,
  },

  namedAccounts: {
    deployer: {
      default: 0,
    },
  }
}

[krakxn]

Push to a repo, we will look into it

[DorianDaSilva]

@Drakenn04 Have you tried reinstalling ethers dependencies from hardhat & restart vscode?

[Grucha98]

@Drakenn04 Did you solve the error? I have the same problem like you! In both ways i mean "call revert exception" if i use getContractAt and if I use getContract "ethers.getContract is not a function"

[N-dcool]

@TimeKeyRoll

[adityapadekar]

@TimeKeyRoll what upper case issue, please share with me too

I am also facing the same issue and I wanna fix it without having to clone

[adityapadekar]

@davyvob what was the actual issue please share, i am stuck on it for hours now

[Tuafo]

const { deployments, ethers, getNamedAccounts } = require("hardhat")
const { assert, expect } = require("chai")
const { developmentChains } = require("../../helper-hardhat-config")

describe("FundMe", function () {
    let fundMe
    let mockV3Aggregator
    let deployer
    beforeEach(async () => {
        // const accounts = await ethers.getSigners()
        // deployer = accounts[0]
        deployer = (await getNamedAccounts()).deployer
        await deployments.fixture(["all"])
        fundMe = await ethers.getContract("FundMe", deployer)
        mockV3Aggregator = await ethers.getContract(
            "MockV3Aggregator",
            deployer
        )
    })

    describe("constructor", function () {
        it("sets the aggregator addresses correctly", async () => {
            const response = await fundMe.priceFeed()
            assert.equal(response, mockV3Aggregator.address)
        })
    })
})

this is my code and it's note working too, this is the following error when i run 'yarn hardhat test':

Compiled 1 Solidity file successfully


  FundMe
    constructor
      1) sets the aggregator addresses correctly


  0 passing (1s)
  1 failing

  1) FundMe
       constructor
         sets the aggregator addresses correctly:
     TypeError: no matching function (argument="key", value="getPriceFeed", code=INVALID_ARGUMENT, version=6.6.4)
      at makeError (node_modules/ethers/src.ts/utils/errors.ts:670:21)
      at assert (node_modules/ethers/src.ts/utils/errors.ts:694:25)
      at assertArgument (node_modules/ethers/src.ts/utils/errors.ts:706:5)
      at Interface.getFunctionName (node_modules/ethers/src.ts/abi/interface.ts:542:23)
      at buildWrappedMethod (node_modules/ethers/src.ts/contract/contract.ts:334:34)
      at Contract.getFunction (node_modules/ethers/src.ts/contract/contract.ts:859:22)
      at Object.get (node_modules/ethers/src.ts/contract/contract.ts:757:39)
      at Context.<anonymous> (test/unit/FundMe.test.js:23:43)



error Command failed with exit code 1.

it was supossed to work, since i already have check every line of code and it's the same from the tutorial. the video link in the part of the code i'm in
https://youtu.be/gyMwXuJrbJQ?t=40700

[Tuafo]

Here is the guide for solving the specific problem i've encountering.

Instructions:

Step 1: Update hardhat.config.js

Navigate to the GitHub repository at https://github.com/PatrickAlphaC/hardhat-fund-me-fcc/blob/main. Find the hardhat.config.js file, copy its requires, and then replace the corresponding sections in your local hardhat.config.js file.

Replace the content of your local hardhat.config.js with the content from the repository

Step 2: Update package.json

In the same GitHub repository, locate the package.json file, copy its contents, and replace the content in your local package.json file.

Replace the content of your local package.json with the content from the repository

Step 3: Delete node_modules and Reinstall Dependencies

After updating your configuration and package files, you should delete your local node_modules directory to remove potentially conflicting dependencies.

Then, in your terminal, run the following command to reinstall all your dependencies:

Reinstall all dependencies

npm i --force

The problem i've been experiencing appears to be related to dependency conflicts. Following these steps should help resolve the issue.

Remember to follow all the instructions in the specified order. If you encounter any problems, please don't hesitate to ask for assistance.

[Grucha98]

Thank you a lot, i'm going to try today! czw., 4 sie 2022 o 12:04 Drakenn04 ***@***.***> napisał(a):

…

Okay 👍🏼 — Reply to this email directly, view it on GitHub <#1503 (reply in thread)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AYN2SLUPRGR3JEEE4MTXDG3VXOIRTANCNFSM55O4EJ7Q> . You are receiving this because you commented.Message ID: <smartcontractkit/full-blockchain-solidity-course-js/repo-discussions/1503/comments/3323951 @github.com>

[Abeltemi]

Hi Please I encountered same problem and yet to get it fixed .. what was the upper case issue and how were you able to fix yours

[N-dcool]

@Abeltemi I solved this issue , I posted how to solve this issue on Ethereum Stackoverflow, here https://ethereum.stackexchange.com/questions/146902/before-each-hook-for-sets-the-aggregator-addresses-correctly-typeerror-cann/146903#146903
the actual problem was related to ethers which was because of JsonpcProvider
Inform me if it solved your problem! Thanks you!

[anuj070894]

Ethers version: 6.8.0

const { assert } = require("chai");

describe("FundMe", () => {
    let fundMe,
        deployer,
        mockV3Aggregator;
    beforeEach(async function () {
        // deploy our fundme contract 
        // using hardhat deploy
        // const accounts = await ethers.getSigners()
        deployer = await ethers.provider.getSigner();
        await deployments.fixture(["all"]); // deploy with tags
        fundMe = await ethers.getContractAt("FundMe", (await deployments.get("FundMe")).address, deployer); // most recently deployed fundme contract
        mockV3Aggregator = await ethers.getContractAt("MockV3Aggregator", (await deployments.get("MockV3Aggregator")).address, deployer);
    });

    describe("constructor", () => {
        it("sets the aggregator addresses correctly", async function () {
            const response = await fundMe.priceFeed();
            assert.equal(response, await mockV3Aggregator.getAddress());
        });
    });
});

This worked for me. I used signer and getContractAt. Still not happy with await ethers.getContractAt("FundMe", (await deployments.get("FundMe")).address, deployer);. Can we do this better? However, the test runs successfully.

[xfcstunluo]

thanks! it really helpful!

[TemidayoVictor]

Thanks found this really helpful

[siddharth-chauhan-it]

I think I found the fix. (Ethers 6.4.0)
Ethers 6 has breaking changes. In the tutorial, Ethers 5 is used.

Steps:

1. Just run the following command: yarn add --dev hardhat @nomiclabs/hardhat-ethers@npm:hardhat-deploy-ethers
2. Use await mockV3Aggregator.getAddress() instead of mockV3Aggregator.address

My hardhat.config.js looks like this:

{
  "name": "hardhat-fund-me",
  "version": "1.0.0",
  "license": "MIT",
  "devDependencies": {
    "@chainlink/contracts": "^0.8.0",
    "@nomicfoundation/hardhat-chai-matchers": "^2.0.0",
    "@nomicfoundation/hardhat-ethers": "^3.0.0",
    "@nomicfoundation/hardhat-network-helpers": "^1.0.0",
    "@nomicfoundation/hardhat-toolbox": "^4.0.0",
    "@nomicfoundation/hardhat-verify": "^2.0.0",
    "@nomiclabs/hardhat-ethers": "npm:hardhat-deploy-ethers",
    "@typechain/ethers-v6": "^0.5.0",
    "@typechain/hardhat": "^9.0.0",
    "@types/chai": "^4.3.11",
    "@types/mocha": "^10.0.6",
    "@types/node": "^20.10.7",
    "chai": "^4.2.0",
    "dotenv": "^16.3.1",
    "ethers": "^6.4.0",
    "hardhat": "^2.19.4",
    "hardhat-deploy": "^0.11.45",
    "hardhat-deploy-ethers": "^0.4.1",
    "hardhat-gas-reporter": "^1.0.8",
    "prettier": "^3.1.1",
    "prettier-plugin-solidity": "^1.3.1",
    "solhint": "^4.1.1",
    "solidity-coverage": "^0.8.0",
    "ts-node": "^10.9.2",
    "typechain": "^8.3.0",
    "typescript": "^5.3.3"
  }
}

My FundMe.test.js looks like this:

const { deployments, ethers, getNamedAccounts } = require("hardhat");
const { assert } = require("chai");

describe("FundMe", function () {
  let fundMe;
  let deployer;
  let mockV3Aggregator;
  beforeEach(async function () {
    deployer = (await getNamedAccounts()).deployer;
    await deployments.fixture(["all"]); // Deploy all contracts from "deploy" folder
    fundMe = await ethers.getContract("FundMe", deployer);
  });

  describe("constructor", async function () {
    it("Sets the aggregator address correctly", async function () {
      const response = await fundMe.priceFeed();
      // console.log(`response: ${response}`);
      
      mockV3Aggregator = await ethers.getContract("MockV3Aggregator", deployer);
      // console.log(`mockV3Aggregator: ${await mockV3Aggregator.getAddress()}`);

      assert.equal(response, await mockV3Aggregator.getAddress());
    });
  });
});

[rocco1226]

Thx bro，it is useful.

[MohammadArif13]

bro can you provide all of your fundMe.test .js code snippet.
I am stack in fundMe.js

[siddharth-chauhan-it]

@MohammadArif13
Here is the link to my repo.
Test >> https://github.com/siddharth-chauhan-it/hardhat-fund-me/blob/main/test/unit/FundMe.test.js
Hardhat Config >> https://github.com/siddharth-chauhan-it/hardhat-fund-me/blob/main/hardhat.config.js

[badukwei]

Here's my solution in "ethers": "^6.13.1" with typescript

import { network, deployments, ethers, getNamedAccounts } from "hardhat";
import { FundMe, MockV3Aggregator } from "../../typechain-types";
import { assert, expect } from "chai";
import { Signer } from "ethers";

describe("FundMe", async () => {
    let fundMe: FundMe;
    let mockV3Aggregator: MockV3Aggregator;
    let deployer;
    let deployerSigner: Signer;

    beforeEach(async () => {
        await deployments.fixture(["all"]); 
        deployer = (await getNamedAccounts()).deployer;
        deployerSigner = await ethers.getSigner(deployer);

        fundMe = await ethers.getContractAt(
            "FundMe",
            (await deployments.get("FundMe")).address,
            deployerSigner,
        ); 
        mockV3Aggregator = await ethers.getContractAt(
            "MockV3Aggregator",
            (await deployments.get("MockV3Aggregator")).address,
            deployerSigner,
        );
    });

    describe("constructor", () => {
        it("sets the aggregator addresses correctly", async () => {
            const response = await fundMe.priceFeed();
            const address = await mockV3Aggregator.getAddress();
            assert.equal(response, address);
        });
    });
});