访问每个承诺中的 URL答案

【问题标题】：Access URL in promise each访问每个承诺中的 URL
【发布时间】：2018-10-24 16:53:38
【问题描述】：

我正在使用 Bluebird.js 和 request-promise NPM 模块。 我想访问 promise URL 或 item.transactionID，如下面的代码所示。 我试图找到很多东西但没有工作我们怎样才能做到这一点。

    paymentIDArray.forEach(item => {
        let p = rp({
            uri: API + item.transactionID,
            headers: {
                "Content-Type": "application/json",
                "Authorization": "Basic " + authCode
            },
            simple: false,
            resolveWithFullResponse: false,
            transform2xxOnly: false
        }).promise();
        promises.push(p);
    });

    await Promise
        .all(promises)
        .each(async (inspection) => {
            if (inspection.isFulfilled()) {

               // I want item.transactionID of each promise here

                let result = JSON.parse(inspection.value());

            } else {
                logger.error(inspection);
                logger.error("A promise in the array was rejected with", inspection.reason());
            }
        });

【问题讨论】：

标签： javascript node.js promise bluebird

【解决方案1】：

您可以将item.id 添加到您推送的承诺值

paymentIDArray.forEach(item => {
    let p = rp({
        uri: API + item.transactionID,
        headers: {
            "Content-Type": "application/json",
            "Authorization": "Basic " + authCode
        },
        simple: false,
        resolveWithFullResponse: false,
        transform2xxOnly: false
    }).promise();
    promises.push(p.then(inspection => ({inspection, id: item.id})));
});

// each promise, instead of being just the result of `rp` is now {inspection: result of rp, id: item.id}
await Promise
.all(promises)
//    vvvvv do you really need async? you are not awaiting in this code
.each(async ({inspection, id}) => {
    if (inspection.isFulfilled()) {

        // id is the required item.id

        let result = JSON.parse(inspection.value());

    } else {
        logger.error(inspection);
        logger.error("A promise in the array was rejected with", inspection.reason());
    }
});

【讨论】：