部署合同时如何将合同地址保存到MongoDB？

Question

我想在部署后获取合同地址，然后将其保存到mongoDB中。但是，相反，我的合同地址被部署在该地址之后。因此，我的mongoDB不会保存我的合同地址。这是我的代码：

//My middleware : '/admin/my-connection/deploy' action => POST

    exports.postContractDeployed = (req, res, next) => {
    const contractId = req.body.contractId;
    const ethereumUri = req.body.ethereumURI;
    const contractABI = req.body.contractABI;
    const contractBytecode = req.body.contractBytecode;

    let web3 = new Web3();
    web3.setProvider(new web3.providers.HttpProvider(ethereumUri));
    //define default account[0]
    const address = web3.eth.accounts[0];

    if (!web3.isConnected()) {
        throw new Error('unable to connect to ethereum node at ' + ethereumUri);
    } 

    let MyContract = web3.eth.contract([{
            contractABI
        }]

    );

    const kodeByte = '0x' + contractBytecode;

    let deployContract = MyContract.new({
        from: address,
        data: kodeByte,
        gas: '4700000'
    }, async function (e, contract) {
        // console.log(e, contract);
        if (typeof contract.address !== 'undefined') {
            console.log('Contract mined! address: ' + contract.address + 'with transactionHash: ' + contract
                .transactionHash);
            global.newContractAddress = contract.address;
            global.newContractTxHash = contract.transactionHash;


    });

    Contract.findById(contractId).then(result => {
        result.contractAddress = global.newContractAddress;
        result.contractTxHash = global.newContractTxHash;
        return result.save();
    }).then(data => {
        console.log('Contract Address has been generate!');
        console.log('My Contract Address : ', global.newContractAddress);
        res.redirect('/admin/my-connection');

    }).catch(err => console.log(err)); };