每次都要求语句还原事务

Question

发生了一些奇怪的事情。我正在测试一些关于remix EVM的合同。我有一些非常基本的NFT质押合同，在质押和转让代币时效果很好。然而，如果我尝试执行unstace函数，事务会被恢复，表示require条件没有通过。然而，更奇怪的是，如果我单独调用require中的函数，则条件为true！

我不知道目前发生了什么，所以请提供任何建议或帮助将不胜感激。目前，我有三份合同(ERC20、ERC721、ERC721staking(，除了unstake功能外，所有功能都正常工作。

这些是我的合同：Energy.sol(ERC20(：

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
import "@openzeppelin/contracts/token/ERC20/ERC20.sol";
import "@openzeppelin/contracts/access/Ownable.sol";
/* Simple ERC20 token contract to issue rewards */
contract Energy is ERC20, Ownable {
mapping(address => bool) minters;
constructor() ERC20("ENERGY", "NRG") {
_mint(msg.sender, 100 * 10**decimals());
}
modifier isMinter() {
require(minters[msg.sender], "Caller is not authorized to mint!");
_;
}
function mintRewards(address to, uint256 amount) external isMinter {
_mint(to, amount * 10**decimals());
}
function addMinter(address account) public onlyOwner {
minters[account] = true;
}
}

燃料溶胶(ERC721(

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
import "@openzeppelin/contracts/token/ERC721/ERC721.sol";
import "@openzeppelin/contracts/token/ERC721/extensions/ERC721Burnable.sol";
import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/utils/Counters.sol";
contract Fuel is ERC721, ERC721Burnable, Ownable {
using Counters for Counters.Counter;
Counters.Counter private _tokenIdCounter;
constructor() ERC721("Fuel", "FUEL") {}
function safeMint(address to) public onlyOwner {
uint256 tokenId = _tokenIdCounter.current();
_tokenIdCounter.increment();
_safeMint(to, tokenId);
}
}

发电机.sol(锁紧(：

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.13;
import "@openzeppelin/contracts/security/ReentrancyGuard.sol";
import "@openzeppelin/contracts/access/Ownable.sol";
import "./Energy.sol";
import "./Fuel.sol";
struct Loader {
uint256[] fuelIds;
mapping(uint256 => uint256) loadBlock;
}
contract Generator is Ownable, ReentrancyGuard, IERC721Receiver {
Fuel fuel;
Energy energy;
uint256 rewardsPerBlock = 5;
mapping(address => Loader) loaders;
// Enumeration of fuelIds staked indexes of a loader
mapping(address => mapping(uint256 => uint256)) public fuelIdIndex;
// tracks owner of a fuelId
mapping(uint256 => address) public loaderOf;
constructor(address _fuel, address _energy) {
fuel = Fuel(_fuel);
energy = Energy(_energy);
}
function stake(uint256 fuelId) public nonReentrant {
// safe checks
require(
fuel.ownerOf(fuelId) == msg.sender,
"You're not the owner of this NFT"
);
// push new token to staking collection
loaders[msg.sender].fuelIds.push(fuelId);
// updates index reference of fuelId
uint256 totalFuel = loaders[msg.sender].fuelIds.length;
fuelIdIndex[msg.sender][fuelId] = totalFuel - 1;
// inits staking block
loaders[msg.sender].loadBlock[fuelId] = block.number;
// add it to reference
loaderOf[fuelId] = msg.sender;
fuel.safeTransferFrom(address(msg.sender), address(this), fuelId);
}
function unstake(uint256 fuelId) public nonReentrant {
// safe checks
require(ownedByThis(fuelId), "This fuel is not being loaded here!");
require(
_loaderOf(fuelId) == address(msg.sender),
"You haven't loaded this fuel here!"
);
uint256 lastFuelIndex = loaders[msg.sender].fuelIds.length - 1;
uint256 fuelIndex = fuelIdIndex[msg.sender][fuelId];
// swap current fuelId to last position
if (lastFuelIndex != fuelIndex) {
uint256 lastFuelId = loaders[msg.sender].fuelIds[lastFuelIndex];
loaders[msg.sender].fuelIds[fuelIndex] = lastFuelIndex; // Move the last token to the slot of the to-delete token
fuelIdIndex[msg.sender][lastFuelId] = fuelIndex; // Update the moved token's index
}
// remove the last element from mapping and array
delete fuelIdIndex[msg.sender][fuelId];
delete loaders[msg.sender].fuelIds[lastFuelIndex];
delete loaders[msg.sender].loadBlock[fuelId];
delete loaderOf[fuelId];
// Transfer back to the owner
fuel.safeTransferFrom(address(this), address(msg.sender), fuelId);
claim(fuelId);
}
function claim(uint256 fuelId) public {
// safe checks
require(ownedByThis(fuelId), "This fuel is not being loaded here!");
require(
_loaderOf(fuelId) == address(msg.sender),
"You haven't loaded this fuel here!"
);
uint256 rewardsToClaim = getPendingRewards(msg.sender, fuelId);
energy.mintRewards(msg.sender, rewardsToClaim);
loaders[msg.sender].loadBlock[fuelId] = block.number;
}
function claimAll() public nonReentrant {
// safe checks
require(
loaders[msg.sender].fuelIds.length > 0,
"You have no fuel loaded here!"
);
uint256 totalFuelLoaded = totalFuelLoadedBy(msg.sender);
for (uint256 i = 0; i < totalFuelLoaded; i++) {
uint256 fuelId = loaders[msg.sender].fuelIds[i];
claim(fuelId);
}
}
function getPendingRewards(address account, uint256 fuelId)
public
view
returns (uint256)
{
uint256 loadBlock = loaders[account].loadBlock[fuelId];
uint256 blocksElapsed = block.number - loadBlock;
return blocksElapsed * rewardsPerBlock;
}
function getAllPendingRewards() public view returns (uint256) {
uint256 totalFuelLoaded = totalFuelLoadedBy(msg.sender);
uint256 totalRewards = 0;
for (uint256 i = 0; i < totalFuelLoaded; i++) {
uint256 fuelId = loaders[msg.sender].fuelIds[i];
totalRewards += getPendingRewards(msg.sender, fuelId);
}
return totalRewards;
}
function _loaderOf(uint256 fuelId) public view returns (address) {
return loaderOf[fuelId];
}
function totalFuelLoadedBy(address account) public view returns (uint256) {
return loaders[account].fuelIds.length;
}
function generatorAddress() public view returns (address) {
return address(this);
}
function ownedByThis(uint256 fuelId) public view returns (bool) {
return address(fuel.ownerOf(fuelId)) == address(this);
}
function onERC721Received(
address operator,
address from,
uint256 fuelId,
bytes calldata data
) external override returns (bytes4) {
return this.onERC721Received.selector;
}
}

如果你想测试流量(我希望你这样做(，请确保首先部署Fuel和Energy合同，然后在部署Generator合同时使用合同的地址作为构造函数参数。然后批准燃料实例中的所有发电机地址，铸造一些nft，在发电机合同中入股，并尝试取消记账。每个函数都可以正常工作，但不稳定函数除外。

再次感谢您的帮助！

Answer 1

函数ownedByThis从您的Fuel合同中获取地址ownerOf(fuelId(，但在您将NFT押入Generator.sol后，现在Generator.sol是该NFT的所有者，而您的函数为ownedByIt的require语句不起作用。我还在Claim函数的最底部添加了(delete loaderOf[fuelId]；(。在打开你的nft之前，不要忘记使用AddMinter函数作为Generator.sol合同的地址。希望我有用。

下方的更新代码

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.15;
import "@openzeppelin/contracts/security/ReentrancyGuard.sol";
import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/token/ERC721/utils/ERC721Holder.sol";
import "./Energy.sol";
import "./Fuel.sol";

contract Generator is Ownable, ReentrancyGuard, ERC721Holder {
Fuel fuel;
Energy energy;
struct Loader {
uint256[] fuelIds;
mapping(uint256 => uint256) loadBlock;
}
uint256 rewardsPerBlock = 5;
mapping(address => Loader) loaders;
// Enumeration of fuelIds staked indexes of a loader
mapping(address => mapping(uint256 => uint256)) public fuelIdIndex;
// tracks owner of a fuelId
mapping(uint256 => address) public loaderOf;
constructor(address _fuel, address _energy) {
fuel = Fuel(_fuel);
energy = Energy(_energy);
}
function stake(uint256 fuelId) public nonReentrant {
// safe checks
require(
fuel.ownerOf(fuelId) == msg.sender,
"You're not the owner of this NFT"
);
// push new token to staking collection
loaders[msg.sender].fuelIds.push(fuelId);
// updates index reference of fuelId
uint256 totalFuel = loaders[msg.sender].fuelIds.length;
fuelIdIndex[msg.sender][fuelId] = totalFuel - 1;
// inits staking block
loaders[msg.sender].loadBlock[fuelId] = block.number;
// add it to reference
loaderOf[fuelId] = msg.sender;
fuel.safeTransferFrom(address(msg.sender), address(this), fuelId);
}
function unstake(uint256 fuelId) public nonReentrant {
// safe checks
require(msg.sender == loaderOf[fuelId], "You are not the owner"); 
//require(ownedByThis(fuelId), "This fuel is not being loaded here!");
// require(
//     _loaderOf(fuelId) == address(msg.sender),
//     "You haven't loaded this fuel here!"
// );
uint256 lastFuelIndex = loaders[msg.sender].fuelIds.length - 1;
uint256 fuelIndex = fuelIdIndex[msg.sender][fuelId];
// swap current fuelId to last position
if (lastFuelIndex != fuelIndex) {
uint256 lastFuelId = loaders[msg.sender].fuelIds[lastFuelIndex];
loaders[msg.sender].fuelIds[fuelIndex] = lastFuelIndex; // Move the 
last token to the slot of the to-delete token
fuelIdIndex[msg.sender][lastFuelId] = fuelIndex; // Update the 
moved token's index
}
// remove the last element from mapping and array
delete fuelIdIndex[msg.sender][fuelId];
delete loaders[msg.sender].fuelIds[lastFuelIndex];
delete loaders[msg.sender].loadBlock[fuelId];

// Transfer back to the owner
fuel.safeTransferFrom(address(this), address(msg.sender), fuelId);
claim(fuelId);
}
function claim(uint256 fuelId) public {
// safe checks
//require(ownedByThis(fuelId), "This fuel is not being loaded here!");
require(msg.sender == loaderOf[fuelId], "You are not the owner");
// require(
//     _loaderOf(fuelId) == address(msg.sender),
//     "You haven't loaded this fuel here!"
// );
uint256 rewardsToClaim = getPendingRewards(msg.sender, fuelId);
energy.mintRewards(msg.sender, rewardsToClaim);
loaders[msg.sender].loadBlock[fuelId] = block.number;
delete loaderOf[fuelId];
}
function claimAll() public nonReentrant {
// safe checks
require(
loaders[msg.sender].fuelIds.length > 0,
"You have no fuel loaded here!"
);
uint256 totalFuelLoaded = totalFuelLoadedBy(msg.sender);
for (uint256 i = 0; i < totalFuelLoaded; i++) {
uint256 fuelId = loaders[msg.sender].fuelIds[i];
claim(fuelId);
}
}
function getPendingRewards(address account, uint256 fuelId) public view 
returns (uint256) {
uint256 loadBlock = loaders[account].loadBlock[fuelId];
uint256 blocksElapsed = block.number - loadBlock;
return blocksElapsed * rewardsPerBlock;
}
function getAllPendingRewards() public view returns (uint256) {
uint256 totalFuelLoaded = totalFuelLoadedBy(msg.sender);
uint256 totalRewards = 0;
for (uint256 i = 0; i < totalFuelLoaded; i++) {
uint256 fuelId = loaders[msg.sender].fuelIds[i];
totalRewards += getPendingRewards(msg.sender, fuelId);
}
return totalRewards;
}
function _loaderOf(uint256 fuelId) public view returns (address) {
return loaderOf[fuelId];
}
function totalFuelLoadedBy(address account) public view returns (uint256) {
return loaders[account].fuelIds.length;
}
function generatorAddress() public view returns (address) {
return address(this);
}
// function ownedByThis(uint256 fuelId) public view returns (bool) {           
//     return address(fuel.ownerOf(fuelId)) == address(this);
// }
function onERC721Received(address, address, uint256, bytes memory) public 
virtual override returns (bytes4) {
return this.onERC721Received.selector;
}
}