1

Here is a mapping to loans:

mapping (uint256 => Loan) public loans;

I then use: uint256(keccak256(abi.encode(address(msg.sender), tokenId))); to create a unique loanId from a struct.


 function onERC721Received(
        address,
        address from,
        uint256 tokenId,
        bytes calldata
    )
        external
        override
        returns(bytes4)
    {
        uint256 loanId = uint256(keccak256(abi.encode(address(msg.sender), tokenId)));
        loans[loanId] = Loan({
            nftContract: ERC721(msg.sender),
            tokenId: tokenId,
            borrower: from,
            repayable: false
        });

        // lend(from);
        return 0x150b7a02;
    }

Now, to access my a loan, I retrieve the unique id with the following fuction:


    function getLoanId(address _tokenContract, uint256 _tokenId) public pure returns (uint256) {
      return uint256(keccak256(abi.encode(address(_tokenContract), _tokenId)));
    }

However, the id the keccak256 spits out doesn't return any data from my mapping. Any ideas why?

1 Answer 1

1

this works just fine. make sure your arguments are correct when you call `getLoanId()'.

you could possibly be confusing the _tokenContract argument with that of the NFT contract and not the msg.sender

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