Extending multiple upgradeable ERC721 contracts

presidento23 · January 4, 2021, 8:53am

I'm having a hard time figuring out what functions I need to implement myself when making an NFT that inherits from ERC721PausableUpgradeable and ERC721BurnableUpgradeable. I'm assuming I don't need to change any of the functions that already exist in the two contracts except for `_BeforeTokenTransfer`. Also what variables do I need to initialize?

Environment

Latest Truffle Versions. Latest OpenZeppelin Version

Details

Code to reproduce

abcoathup · January 3, 2021, 6:33pm

Hi @presidento23,

You can use the preset: ERC721PresetMinterPauserAutoIdUpgradeable as a guide:

github.com

OpenZeppelin/openzeppelin-contracts-upgradeable/blob/v3.3.0/contracts/presets/ERC721PresetMinterPauserAutoIdUpgradeable.sol

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

import "../access/AccessControlUpgradeable.sol";
import "../GSN/ContextUpgradeable.sol";
import "../utils/CountersUpgradeable.sol";
import "../token/ERC721/ERC721Upgradeable.sol";
import "../token/ERC721/ERC721BurnableUpgradeable.sol";
import "../token/ERC721/ERC721PausableUpgradeable.sol";
import "../proxy/Initializable.sol";

/**
 * @dev {ERC721} token, including:
 *
 *  - ability for holders to burn (destroy) their tokens
 *  - a minter role that allows for token minting (creation)
 *  - a pauser role that allows to stop all token transfers
 *  - token ID and URI autogeneration
 *

This file has been truncated. show original

For initialization, also see: https://docs.openzeppelin.com/contracts/3.x/upgradeable#multiple-inheritance

abcoathup · January 3, 2021, 11:56pm

A post was split to a new topic: Initialize ERC721 extending preset