javascript - 处理 Promise.all() 中每个 Promise 的响应对象

Question

我有一个后端点，它创建客户并返回 userId 作为响应

例如

// Post Data
const customers = [{
    firstName: 'John',
    lastName: 'Smith',
    userId: '12345
  },
  {
    firstName: 'Phil',
    lastName: 'Doe',
  },
  {
    firstName: 'Dan',
    lastName: 'Joe',
  }
]


app.post('/customers', (req, res) => {
  const arrayPromises = []
  const customers = req.body.customers;
  customers.forEach((customer) => {
    //checking whether I have a userId already
    if (!customer.userId) {
      const postRequest = {
        headers: Object.assign(res._headers, {
          Accept: 'application/json',
          'Content-Type': 'application/json',
        }),
        post:'www.createUserExample.com,
        customer // post data,
      };
      arrayPromises.push(axios(postRequest))
      //response will be {userId}
    }
  })


  Promise.all(arrayPromises).then(result => {
    //by this way I get all userids
    res.status(200).json(result.data)
  })


})

但是我需要发送一个包含 userIds 的响应对象

示例响应对象应该类似于

[{
    firstName: 'John',
    lastName: 'Smith',
    userId: '12345'
  },
  {
    firstName: 'Phil',
    lastName: 'Doe',
    userId: '65765'
  },
  {
    firstName: 'Dan',
    lastName: 'Joe',
    userId: '786876'
  }
]

因此，总的来说，我希望拥有客户的属性，并将创建的 userId 附加到发布数据对象并作为响应发送。

请让我知道最好的方法。我喜欢通过异步请求来创建客户

Answer 1

只需将已有 id 的对象插入数组即可。 (或对他们做出 promise )。然后，Promise.all 将生成您正在查找的数组。该数组不一定需要仅包含 API 请求的 promise :

const arrayPromises = []
const customers = req.body.customers;
customers.forEach((customer) => {
  //checking whether I have a userId already
  if (customer.userId) {
    arrayPromises.push(Promise.resolve(customer));
  } else {
    arrayPromises.push(axios(…));
  }
});

您还可以简化为

const arrayPromises = req.body.customers.map((customer) => {
  //checking whether I have a userId already
  return customer.userId
    ? Promise.resolve(customer)
    : axios(…);
});