Hardhat部署FundMe报错：未找到MockV3Aggregator部署实例

执行部署命令 yarn hardhat deploy --tags fundme 部署FundMe项目时，触发MockV3Aggregator相关错误，完整报错信息如下：

Error: ERROR processing /Users/mohameduzair/blockChain/JSweb3_2/fundMe_hardhat/deploy/01-deploy-fundMe.js:
Error: No deployment found for: MockV3Aggregator at Object.get (/Users/mohameduzair/blockChain/JSweb3_2/fundMe_hardhat/node_modules/hardhat-deploy/src/DeploymentsManager.ts:162:17)

现有相关代码 #

01-deploy-fundMe.js 部署脚本 #

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

    let ethUsdPriceFeedAddress
    if (developmentChains.includes(network.name)) {
        // if (chainId === 31337) {
        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(`FundMe deployed at ${fundMe.address}`)
    log(`-------------------------!!!--------------------------`)
}
module.exports.tags = ["all", "fundme"] 

MockV3Aggregator.sol 合约代码 #

// SPDX-License-Identifier: MIT
pragma solidity ^0.6.0;
// pragma solidity >=0.6.6 <0.8.7;
import "@chainlink/contracts/src/v0.6/tests/MockV3Aggregator.sol";

报错核心是：执行带fundme标签的部署命令时，Hardhat只会运行匹配fundme标签的部署脚本，不会自动执行Mock合约的部署逻辑，deployments.get("MockV3Aggregator")找不到已部署的MockV3Aggregator实例，直接抛出错误。

按以下顺序排查修复即可：

• 补全MockV3Aggregator的部署脚本，在deploy目录下新建00-deploy-mocks.js（文件名前缀数字必须小于FundMe部署脚本的前缀，保证执行顺序在前），代码参考如下：

const { network } = require("hardhat")
// 从配置文件引入常量，需要提前在helper-hardhat-config.js中定义
const { developmentChains, DECIMALS, INITIAL_PRICE } = require("../helper-hardhat-config")

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

    if (developmentChains.includes(network.name)) {
        log("Detected local development chain, deploying price feed mock...")
        await deploy("MockV3Aggregator", {
            from: deployer,
            args: [DECIMALS, INITIAL_PRICE],
            log: true
        })
        log("Mock contract deployed completed")
        log("----------------------------------------")
    }
}
module.exports.tags = ["all", "mocks"]

配置文件中需要定义的常量参考：developmentChains = ["hardhat", "localhost"]，DECIMALS = 8，INITIAL_PRICE = 200000000000（对应ETH初始价格2000USD）

• 检查01-deploy-fundMe.js顶部是否正确引入了developmentChains和networkConfig变量，否则判断本地链的逻辑不会生效。
• 检查hardhat.config.js中是否已经注册hardhat-deploy、@nomiclabs/hardhat-ethers依赖插件，缺失插件会导致部署功能异常。
• 部署时选择以下任意一种方式即可解决找不到Mock的问题：
  1. 先执行yarn hardhat deploy --tags mocks完成Mock合约部署，再执行yarn hardhat deploy --tags fundme部署FundMe
  2. 直接执行yarn hardhat deploy，hardhat-deploy会按文件名顺序执行所有带all标签的脚本，先部署Mock再部署业务合约，不会出现依赖缺失问题。

内容的提问来源于stack exchange，提问作者uzair