Do not understand the logic of transfering msg.value

[yeuyeuh]

Hi,

I'm trying to learn solidity. I think I misunderstood something.

Here you said that :

polygon-ethereum-nextjs-marketplace/contracts/NFTMarketplace.sol

Line 113 in c5a3526

payable(idToMarketItem[tokenId].seller).transfer(msg.value);

but just before you said that the seller is address(0) :

polygon-ethereum-nextjs-marketplace/contracts/NFTMarketplace.sol

Line 109 in c5a3526

idToMarketItem[tokenId].seller = payable(address(0));

So what I understand is that instead of transfering the msg.value to the old owner, you transfer it to address(0). Do you want to do that or I didn't understand it correctly ?

Thank you,
Inaki

[ghost]

I think that's wrong when i buy nft the ethereum value dissapear into thin air becasue of seller address becoming address(0) but after moving
idToMarketItem[tokenId].seller = payable(address(0));
after
payable(idToMarketItem[tokenId].seller).transfer(msg.value);
its working perfectly.

[yeuyeuh]

Ok thank you !
How do you check that with the HardHat test?
I tried to had these 2 lines but I get "0" :

    const buyerBalance = await nftMarketplace.balanceOf(buyerAddress.address);
    console.log('buyerBalance: ', buyerBalance.toString())

So I think that balanceOf() is not the right function.
Do you have a suggestion?

[ghost]

i have no clue about that i am learning myself and playing with it using truffle >.>
I am basically experimenting it for my use,so i wanted to move out of hardhat.