Question

39

Promise.all(...).spread is not a function when running promises in parallel

rated 0 times [ 46] [ 7] / answers: 1 / hits: 21508 / 7 Years ago, sun, march 12, 2017, 12:00:00

I'm trying to run 2 promises in paralel with sequelize, and then render the results in a .ejs template, but I'm receiving this error:

 Promise.all(...).spread is not a function

This is my code:

var environment_hash = req.session.passport.user.environment_hash;

var Template  = require('../models/index').Template;

var List      = require('../models/index').List;



var values = { 

    where: { environment_hash: environment_hash,

             is_deleted: 0 

        }                    

};



template = Template.findAll(values);

list = List.findAll(values);





Promise.all([template,list]).spread(function(templates,lists) {



    res.render('campaign/create.ejs', {

        templates: templates,

        lists: lists

    });



});

How can I solve thhis?

Answers

Only authorized users can answer the question. Please sign in first, or register a free account.

jacklynr

Add To Favorites

Follow

Total Points: 542

Total Questions: 120

Total Answers: 95

Location: Cape Verde

Member since Fri, Nov 27, 2020

4 Years ago

jacklynr questions

1 How to trigger change blockchain network request on MetaMask

Mon, Jul 5, 21, 00:00, 3 Years ago

1 ResizeObserver loop limit exceeded - stop exception

Fri, Jan 15, 21, 00:00, 3 Years ago

1 Is it safe to use `expo install` for everything that I need to install?

Mon, Sep 7, 20, 00:00, 4 Years ago

1 How do i make image bigger using setimage discord.js

Thu, Jun 11, 20, 00:00, 4 Years ago

1 confusion about this React custom hook usage

Thu, Jun 4, 20, 00:00, 4 Years ago

View All

answered 7 Years ago kevenjeffreyr · Accepted Answer

I'll make my comment into an answer since it solved your issue.

.spread() is not a standard promise method. It is available in the Bluebird promise library. Your code you included does not show that. Three possible solutions:

Access array values directly

You can just use .then(results => {...}) and access the results as results[0] and results[1].

Include the Bluebird Promise library

You can include the Bluebird promise library so you have access to .spread().

var Promise = require('bluebird');

Use destructuring in the callback arguments

In the latest versions of nodejs, you could also use destructuring assignment which kind of removes the need for .spread() like this:

Promise.all([template,list]).then(function([templates,lists]) {

    res.render('campaign/create.ejs', {templates, lists});

});