Lesson 7: reusing "FundMe" at 0x344bABC478aCA638d1d0a9925e95e92Db480e7Bb

[tusharr1411]

when I am trying to deploy on a testnet[ goerli or sepolia], first time it deployed perfectly with the following terminal output

after first deployment whener I tried to deploy again on same network it shows following terminal output:

I want to know why is this happenig. I it's reusing contract instead of deploying it agian.

Here are my codes:

00-deploy-mock.js

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

module.exports = async ({getNamedAccounts, deployments}) =>{

	const {deploy,log}  = deployments;
	const {deployer} = await getNamedAccounts();
	const chainId = network.config.chainId;

	if(developmentChains.includes(network.name)){
		log("**********Ahh.. directly or indirectly local network is selected. Deploying Mocks...  *********")
		await deploy("MockV3Aggregator", {
			constract: "MockV3Aggregator",
			from: deployer,
			log:true,
			args: [DECIMALS, INITIAL_ANSWER]
		})

		log("Mocks Deployed !")
		log("____________________________________________________________")
	}
}

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

01-deploy-fund-me.js

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

module.exports = async ({getNamedAccounts,deployments}) =>{
	const { deploy, log} = deployments;
	const {deployer} = await getNamedAccounts();
	const chainId = network.config.chainId;

	// const ethUsdPriceFeedAddress  = networkConfig[chainId]["ethUsdPriceFeed"]
	let ethUsdPriceFeedAddress;

	if(developmentChains.includes(network.name)){
		const ethUsdAggregator = await deployments.get("MockV3Aggregator")
		ethUsdPriceFeedAddress = ethUsdAggregator.address;
	}
	else{
		ethUsdPriceFeedAddress  = networkConfig[chainId]["ethUsdPriceFeed"]
	}



	const fundMe = await deploy("FundMe",{
		from:deployer,
		args: [ethUsdPriceFeedAddress],
		log:true,
	})
	log("-----------transaction Completed--------------")
}


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

helper-hardhat-config.js

const networkConfig = {
    11155111:{
        name:"sepolia",
        ethUsdPriceFeed:"0x694AA1769357215DE4FAC081bf1f309aDC325306"
    },
    5: {
        name:"goerli",
        ethUsdPriceFeed: "0xD4a33860578De61DBAbDc8BFdb98FD742fA7028e"
    },
    137:{
        name:"polygon",
        ethUsdPriceFeed:"0x56672nhHGHgygwu278randomaddress"
    },
    31337: {
        name: "localhost",
    },

    //
}

const developmentChains = ["hardhat", "localhost", "ganache"]
const DECIMALS  = 8;
const INITIAL_ANSWER = 200000000000

//export this network config to be available for other parts of this project
module.exports = {
    networkConfig,
    developmentChains,
    DECIMALS,
    INITIAL_ANSWER
}

[Nlferu]

Hello @tusharr1411

It is just hardhat framework specific. Whenever hardhat detect you are trying to deploy contract same to already deployed it will just give you that deployed one as there is no point deploying same thing over and over on sepolia or goerli. If you really want to deploy again same thing just remove deployments folder along with cache and artifacts folders and you will get what you want. In case you will even sligthly change contract code you want to deploy it will be deployed also to new address.

[tusharr1411]

So it means hardhat saves the deployed contracts locally.So that's how we were interacting with MockV3Aggregator.sol in localhost network locally. That's cool... Thanks for your explation Patryk !

[Nlferu]

No problem Sir, glad I could help :)