ERC1155 - Function has override specified but does not override anything

Question

I am trying to override _update method from ERC1155 openzeppelin standard in my contract to write som additional logic but compiler somehow complains about "Function has override specified but does not override anything", this is my code:

pragma solidity ^0.8.4;

import "@openzeppelin/contracts/access/AccessControl.sol";
import "@openzeppelin/contracts/token/ERC1155/ERC1155.sol";

contract MyContract is ERC1155, AccessControl {

...
function _update(address from, address to, uint256[] memory ids, uint256[] memory values) internal override {
        
        // my custom logic...
        
        super._update(from, to, ids, values);
    }
...

}

Alongside with the error it says second error for super._update part Member "_update" not found or not visible after argument-dependent lookup in type(contract super MyContract).

So it looks like MyContract does not see ERC1155 functions from which it inherits? I am trying to comprehend how it works and never worked with inheritance in solidity. I am wondering whether I can override _update method in general, when it is marked as internal virtual in ERC1155 standard. Can I actually override internal functions and will it work?

Answer 1

So the problem lies in two different versions of Openzeppelin repositary contracts. Compiler automatically imports older 0.8.0 version, which do not contain _update method at all and instead uses _beforeTokenTransfer and _afterTokenTransfer hooks. Those were probably removed in newer 0.8.20 version available in Openzeppelin github repositary and I thought compiler always imports the newest version.

So the problem has two solutions, either override _beforeTokenTransfer (which is what I did) or force compiler to import newer version and override _update method instead.

I hope this helps someone in the future. Compiler never lies.