如何链接Postgres查询，然后使用promise在NodeJS中获取请求

Question

在我的NodeJS应用程序中，我需要对Postgres进行查询，然后我需要对PG结果中的每一行进行GET请求。并将数组中的所有GET结果返回。

我的代码有什么问题？

var promise = require('bluebird'); 
var pgp = require('pg-promise')({ promiseLib: promise }); 
var db = pgp(connectionString); 
var rp = require('request-promise'); 

var query = 'select id from my_table'; 

var processIDs = pgResults => { 
    var requests = pgResults.map(row => rp(`mysite.com/${row.id}`)); 
    return promise.all(requests); 
} 

db.any(query) 
    .then(processIDs) 
    .then(results => console.log(results)); 

第二个问题，如何在最终结果数组中包含PG查询的ID？包括从最后的结果你的PG查询IDS

Answer 1

一种方法是有另一个承诺内processIDs通话，这样的：

var processIDs = (result) => { 
    var ids = result.map(row => row.id); 
    var requests = ids.map(id => request(`mysite.com/${id}`)); 
    return promise.all(requests) 
     .then(results => { 
      // not sure how u want to include `ids` in results, but its available in this scope 
      // just think that it's weird, cuz `results` is supposed to be 
      // an array of HTTP responses, right? 
      return results; // results.concat(ids) || results.push(ids) 
     }); 
}