How to call functions or access public mappings from inside of a subgraph?

Question

I have this struct and mapping inside my smart-contract:

struct attrStruct {
    uint256 generation;
    string faction;
}

mapping(uint256 => attrStruct) public attributes;

I want to fetch and store new version of this struct ( they get modified on-chain in normal transactions ). How can I use something like await contract.attributes(tokenId) inside my subgraph?

Mapping.ts

export function handleTransfer(event: TransferEvent): void {
    let token = Token.load(event.params.tokenId.toString())
    if (!token) {
        token = new Token(event.params.tokenId.toString())
        // What to write here to fetch the struct?
    }
}

Answer 1

You can use .bind contract

Uniswap V3 subgraph has an example here: https://github.com/Uniswap/v3-subgraph/blob/bf03f940f17c3d32ee58bd37386f26713cff21e2/src/mappings/core.ts#L402-L404

 let poolContract = PoolABI.bind(event.address) // bind the contract ABI to the address
 let feeGrowthGlobal0X128 = poolContract.feeGrowthGlobal0X128() // call method feeGrowthGlobal0X128()
 let feeGrowthGlobal1X128 = poolContract.feeGrowthGlobal1X128() // call method feeGrowthGlobal1X128()