_setTokenURI for upgradeable NFTs (ERC721Upgradeable)

Support Upgrades
1

I was following a tutorial to make a basic NFT, but I wanted to make an upgradeable NFT with ERC721Upgradeable.sol (is this even useful?). In the tutorial @ https://docs.alchemy.com/alchemy/tutorials/how-to-create-an-nft, they use the method _setTokenURI(newItemId, tokenURI). However, that method does not appear to exist for ERC721Upgradeable.sol. Am I doing something wrong or is there a reason for this? My code is below.

import "@openzeppelin/contracts-upgradeable/token/ERC721/ERC721Upgradeable.sol";
import "@openzeppelin/contracts-upgradeable/token/ERC721/ERC721Upgradeable.sol";
import "@openzeppelin/contracts-upgradeable/utils/CountersUpgradeable.sol";
import "@openzeppelin/contracts-upgradeable/access/OwnableUpgradeable.sol";

contract MyNFT is ERC721Upgradeable, OwnableUpgradeable {
    using CountersUpgradeable for CountersUpgradeable.Counter;
    CountersUpgradeable.Counter private _tokenIds;

    function initialize() public initializer {
        __ERC721_init("MYNFT", "NFT");
    }

    function mintNFT(address recipient, string memory tokenURI)
        public
        onlyOwner
        returns (uint256)
    {
        _tokenIds.increment();

        uint256 newItemId = _tokenIds.current();
        _mint(recipient, newItemId);
        _setTokenURI(newItemId, tokenURI);

        return newItemId;
    }
}

:computer: Environment

2

Ah it seems I was using an older version of ERC721, and this method is not in ERC721Upgradeable. What is the alternative to _setTokenURI?

3

See this thread for discussion and recommendations:

4

For anyone that is still figuring out how to accomplish this, the way I did it was to extends not from ERC721Upgradeable, but from one of the extensions, ERC721URIStorageUpgradeable, that you can find at @openzeppelin/contracts-upgradeable/token/ERC721/extensions/ERC721URIStorageUpgradeable.sol

This one extends from ERC721Upgradeable, and manages the tokenURIs, i.e. it has the _setTokenURI function.

1 Like