Is it possible to for all "failures" to be returned at once in Q.All

Question

Essentially I have a ton of objects that I want to test the website on. I am using underscore to transform the URL into an array of promises for HTTP requests. As soon as one fails the chain is ending (I expected this). Is it possible for all the failures to be collected and returned to the Fail function? Or am I going to have to write this using allSettled and then parse that?

var Q = require('q')
var _ = require('underscore')
var JSON = require('JSON')
var FS = require("q-io/fs");
var HTTP = require("q-io/http");


FS.read('members.json').then(function(memberJson){
    return JSON.parse(memberJson)
}).then(function(memberObjects){
    var httpCheckPromises = _.
        chain(memberObjects).
        first(100).
        filter(function(member){
            return member.website.toLowerCase().indexOf('www') >= 0
        }).
        map(function(member){
            return HTTP.read(member.website)
        }).
        value()

    return Q.all(httpCheckPromises)
}).then(function(goodRequests){
    console.log(goodRequests)
}).fail(function(badRequests){
    console.log('bad')
    console.log(badRequests)
})

Answer 1

Am I going to have to write this using allSettled and then parse that?

Yes, if you don't want to abort on the first failed request.

FS.read('members.json')
.then(JSON.parse)
.then(function(memberObjects){
    var httpCheckPromises = _.chain(memberObjects)
        .first(100)
        .pluck("website")
        .filter(function(website){
            return website.toLowerCase().indexOf('www') >= 0;
        })
        .map(HTTP.read)
        .value();
    return Q.allSettled(httpCheckPromises);
}).then(function(requests) {
    var goodRequests = _.chain(requests)
        .where({state:"fulfilled"})
        .pluck("value")
        .value(),
    badRequests = _.chain(requests)
        .where({state:"rejected"})
        .pluck("reason")
        .value();
    console.log("good:", goodRequests);
    console.log("bad:", badRequests);
});