多个异步函数调用

Question

given the situation there is an action inside a NodeJs server (in my case SailsJs) where I need to create x different entities in one call. It is not possible for the client to call the action x times. What is the best/recommended way of creating these entities regarding callbacks. If I understood callbacks right it is not possibile to just built something like this:

for(var i = 0; i < x; i++){
  User.create(...).exec(...);
}

What would be the right way to implement this?

Bruno

Answer 1

Easy do it with async package

var async = require('async');
async.times(x, function(n, next){
    User.create(...).exec(function(err, user) {
      next(err, user)
    })
}, function(err, users) {
  // processed x times 
});

Answer 2

You can hand over an array of to be created users to User.create . You prepare the array of users first.

With lots of users to be created having some many-to-many relationships, native calls are much faster, eg Mongo bulk inserts.

Sails Reference regarding create