javascript - 如何将 Mongoose 的PROMISE链交易迁移到ASYNC / AWAIT流？

我创建了一个在答应流程中集成数据库响应的API，但是我认为代码的解释很复杂，并且我认为异步/等待方法可以提高理解度和代码本身。

该API使用Mongoose 5.6.1和Express 4.17.1在NodeJS中构建。

您能帮我改善吗？

以下是我要改进的API：

/** New employee */
router.post('/', (req, res) => {
    let { idCompany, name, departament } = req.body;
    let _id = mongoose.Types.ObjectId(); // Generating new MongoDB _ID
    let employeeCreated;

    const promise1 = new Promise((resolve, reject) => {
        // Querying by document '$oid'
        Companies.findOne({ _id: idCompany }, (err, company) => {
            // Error returned
            if (err) reject({ error: "Invalid request, something went wrong!" });
            // Invalid data received
            if (!company) reject({ error: "Unauthorized action!" });
            // Everything OK
            resolve(company);

        });
    })
    .then(company => {
        if(company) {
            const promise2 = new Promise((resolve, reject) => {
                Employees.create({ _id, idCompany, name, departament }, (err, employee) => {
                    // Error returned
                    if (err) reject({ error: "Invalid request, something went wrong!", err });
                    // Everything OK
                    employeeCreated = employee;
                    resolve(company);
                });
            })
            return promise2;
        }else reject({ error: "Company not found!" });
    })
    .then(company => {
        let { name: companyName, address, email, tel, employees } = company;
        employees.push(_id);

        const promise3 = new Promise((resolve, reject) => {
            Companies.findByIdAndUpdate(
                { _id: idCompany },
                { $set: { _id: idCompany, name: companyName, address, email, tel, employees } }, // spotlight
                { new: true },
                (err, company) => {
                    // Something wrong happens
                    if (err) reject({ success: false, error: "Can't update company!" });
                    // Everything OK
                    resolve(company);
                }
            );
        });
        return promise3;
    });

    promise1
        .then(() => res.json({ success: true, employeeCreated }))
        .catch(err =>   res.status(400).json({ error: "Invalid request, something went wrong!", err }));
});

问候。

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