nice-tickets

Use Openzeppelin develop a lottery with an upgradeable smart contract

Quick start

download && install

The first things you need to do are cloning this repository and installing its dependencies:

git clone https://github.com/ericfjl/nice-tickets
cd nice-tickets
npm install

start local node

Once installed, let's run Hardhat's testing network. Of course you can config to run eric or other test network by edit the hardhat.config.js file:

npx hardhat node

contracts test

npx hardhat test --network localhost

deploy contracts

Then, on a new terminal, go to the repository's root folder and run this to deploy your contract:

npx hardhat run scripts/deploy_upgradeable.js --network localhost  --show-stack-traces
Deploying NiceTickets...
NiceTickets deployed to: 0x9fE46736679d2D9a65F0992F2272dE9f3c7fa6e0

start frontend (React App):

cd frontend
npm install
npm start

dApp test

Click http://localhost:3000/ to show dApp. the first, Metamask must be installed and listening to localhost 8545.

Troubleshooting

The err "Nonce too high. ..." occurred when use MetaMask to transaction

err : Nonce too high. Expected nonce to be 0 but got 1. Note that transactions can't be queued when automining.
operating steps : Web MetaMask > Settings > Advanced > Reset Account.

underlying network changed

// err : Please connect Metamask to Localhost:8545
//operating steps : check the chainId: 31337 in hardhat.config.js and Dapp.js(const HARDHAT_NETWORK_ID = '31337') whether equal

npm start err(MacOS)

npm start

> frontend@0.1.0 start
> react-scripts start

There might be a problem with the project dependency tree.
It is likely not a bug in Create React App, but something you need to fix locally.

The react-scripts package provided by Create React App requires a dependency:

  "webpack": "4.42.0"

Don't try to install it manually: your package manager does it automatically.
However, a different version of webpack was detected higher up in the tree:

  /Users/xxx/node_modules/webpack (version: 3.12.0) 

operating steps (.env 's path is project's root path):

echo SKIP_PREFLIGHT_CHECK=true >> .env

demo dapp

http://159.138.104.81:3000

references

• hardhat
• upgradeable
• hardhat-hackathon-boilerplate