在ERC1155 URI存储中要重写哪个函数

Question

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.4;

import "@openzeppelin/contracts/token/ERC1155/ERC1155.sol";
import "@openzeppelin/contracts/token/ERC1155/extensions/ERC1155URIStorage.sol";
import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/token/ERC1155/extensions/ERC1155Supply.sol";

contract MyToken is ERC1155, ERC1155URIStorage, Ownable, ERC1155Supply {
constructor() ERC1155("") {}

function mint(address account, uint256 id, uint256 amount, bytes memory data)
    public
    onlyOwner
{
    _mint(account, id, amount, data);
}

function mintBatch(address to, uint256[] memory ids, uint256[] memory amounts, bytes memory data)
    public
    onlyOwner
{
    _mintBatch(to, ids, amounts, data);
}

// The following functions are overrides required by Solidity.

function _beforeTokenTransfer(address operator, address from, address to, uint256[] memory ids, uint256[] memory amounts, bytes memory data)
    internal
    override(ERC1155, ERC1155Supply)
{
    super._beforeTokenTransfer(operator, from, to, ids, amounts, data);
}
}

我在remix....any帮助中得到了这个错误？

Answer 1

首先，ERC1155URIStorage和ERC1155Supply继承了ERC1155，因此不需要将ERC1155声明为MyToken合同的另一个父级。

发生此错误是因为ERC1155URIStorage和ERC1155 (通过附加声明和通过ERC1155Supply导入)都定义了具有相同签名的函数：

function uri(uint256 tokenId) public view virtual override returns (string memory)

为了解决这个问题，您可能需要再次重写函数，以防您真的需要ERC1155Supply扩展。

function uri(uint256 tokenId) public view override(ERC1155, ERC1155URIStorage) returns (string memory) {
    return ERC1155URIStorage.uri(tokenId);
}