Add ERC1155 BatchTranfer to array of address

Support Contracts
1

Hi,

I’m pretty new to blockchain development and especially ERC1155 and now I’m trying to figure out how to use the BatchTransfer function in an ERC1155 contract.
I want the same function as below but I also want to address _to to be an array, the ID and amount will be a fixed amount.
I’d be most grateful if anyone can help me or point me in the right direction!

:computer: Environment
Remix solidity ^0.5.11,

:1234: Code to reproduce

  function safeBatchTransferFrom(address _from, address _to, uint256[] memory _ids, uint256[] memory _amounts, bytes memory _data)
    public
  {
    // Requirements
    require((msg.sender == _from) || isApprovedForAll(_from, msg.sender), "ERC1155#safeBatchTransferFrom: INVALID_OPERATOR");
    require(_to != address(0), "ERC1155#safeBatchTransferFrom: INVALID_RECIPIENT");

    _safeBatchTransferFrom(_from, _to, _ids, _amounts);
    _callonERC1155BatchReceived(_from, _to, _ids, _amounts, _data);
  }

and

  function _safeBatchTransferFrom(address _from, address _to, uint256[] memory _ids, uint256[] memory _amounts)
    internal
  {
    require(_ids.length == _amounts.length, "ERC1155#_safeBatchTransferFrom: INVALID_ARRAYS_LENGTH");

    // Number of transfer to execute
    uint256 nTransfer = _ids.length;

    // Executing all transfers
    for (uint256 i = 0; i < nTransfer; i++) {
      // Update storage balance of previous bin
      balances[_from][_ids[i]] = balances[_from][_ids[i]].sub(_amounts[i]);
      balances[_to][_ids[i]] = balances[_to][_ids[i]].add(_amounts[i]);
    }

    // Emit event
    emit TransferBatch(msg.sender, _from, _to, _ids, _amounts);
  }
1 Like
2

Hi @Dazzy,

Welcome to the community :wave:

ERC1155 offers a BatchTransfer fof multiple token IDs and values but not recipients.

You can add your own BatchTransfer but you will need to comply with the EIP:

See scenario 9 and Implementation specific transfer API rule in the EIP on Safe Transfer rules:

You will need to emit a TransferSingle for each transfer.

Your code will essentially need to loop through calls to safeTransferFrom (https://docs.openzeppelin.com/contracts/4.x/api/token/erc1155#ERC1155-safeTransferFrom-address-address-uint256-uint256-bytes-) or equivalent.

1 Like