Implementing request.postAsync promise with bluebird - node.js

Question

I am using the bluebird promises framework to make a POST request and get the response to that POST request:
var Promise = require('bluebird');
var request = Promise.promisifyAll(require('request'));
// Set the headers
var headers = {
'User-Agent': 'Super Agent/0.0.1',
'Content-Type': 'application/x-www-form-urlencoded'
}
var options = [];
var scores = [];
// Configure the request
options[0] = {
url: 'https://api.havenondemand.com/1/api/sync/analyzesentiment/v1',
method: 'POST',
headers: headers,
form: {'apikey': 'XXXXXXXXXXX', 'text': 'I love dogs'}
}
// Start the request
request.postAsync(options[0]).spread(function(response, body) {
if (response.statusCode == 200) {
var answer = JSON.parse(body);
scores[0] = answer['aggregate']['score'];
}
}).then(function() { console.log(scores[0]) });
This is the error message that I am getting:
Unhandled rejection TypeError: expecting an array or an iterable object but got [object Null]
at apiRejection (/Users/vphuvan/demos/node_modules/bluebird/js/release/promise.js:10:27)
etc.
What do I have to do to resolve this error message?
Note: the version of bluebird I am currently using is 3.0.5

Answer 1

You need to set multiArgs: true in bluebird 3. This is one of the changes in the promisify API of bluebird 3.
Full solution below.
var Promise = require('bluebird');
var request = Promise.promisifyAll(require('request'), { multiArgs: true });
// Set the headers
var headers = {
'User-Agent': 'Super Agent/0.0.1',
'Content-Type': 'application/x-www-form-urlencoded'
}
var options = [];
var scores = [];
// Configure the request
options[0] = {
url: 'https://api.havenondemand.com/1/api/sync/analyzesentiment/v1',
method: 'POST',
headers: headers,
form: {'apikey': 'XXXXXXXXXXX', 'text': 'I love dogs'}
}
// Start the request
request.postAsync(options[0]).spread(function(response, body) {
if (response.statusCode == 200) {
var answer = JSON.parse(body);
scores[0] = answer['aggregate']['score'];
}
}).then(function() { console.log(scores[0]) });

Answer 2

Here is an answer that works: use the 'request-promise' framework. I am using request-promise#1.0.2, which is based on bluebird#2.10.2. Clearly, something undocumented happened between bluebird#2.10.2 and bluebird#3.0.5
var rp = require('request-promise');
// Set the headers
var headers = {
'User-Agent': 'Super Agent/0.0.1',
'Content-Type': 'application/x-www-form-urlencoded'
}
var options = [];
var scores = [];
var text = 'I love dogs';
// Configure the request
options[0] = {
url: 'https://api.havenondemand.com/1/api/sync/analyzesentiment/v1',
method: 'POST',
headers: headers,
form: {'apikey': 'XXXXXXXXXX', 'text': text}
}
// Start the request
rp(options[0])
.then(function (body) {
// POST succeeded...
console.log(body);
var answer = JSON.parse(body);
scores[0] = answer['aggregate']['score'];
})
.then(function() { console.log(scores[0]); })
.catch(function (err) {
throw err
});