Use promises in nested maps with $q.all()

Question

I am trying to figure out what data-structure of promises I can use in $q.all() function. I know that I can give it an array of promises and a map of promises, but can I give it an aribitrary depth map as well? eg can I do something like:

var map = {};
map["A"] = {};
map["A"]["B"] = MyService.getPromise();

$q.all(map).then(function(resultMap){
    // does resultMap match the structure of the input map?
    console.debug(resultMap["A"]["B"])
})

And if I can't, what is the suggested way to do something like this? I would like to know the original level inside the map of my resulting data.

No you can't pass an arbitrary object to it. What higher level problem are you trying to solve? — charlietfl, Feb 14 '17 at 12:24

score 0 · Answer 1 · answered Feb 14 '17 at 12:28

0

For me this looks pretty simple and works:

 var promises = [];

 promises.push(MyService.getPromise().then(function(result) {
    map["A"]["B"] = result;
 }));

 promises.push(MyService.getPromise().then(function(result) {
    map["A"]["C"] = result;
 }));

...

$q.all(promises).then(function() {
  // map is initialized here
})

answered Feb 14 '17 at 12:28

Petr Averyanov

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how do you know that the result is for C or B ? – rex Feb 14 '17 at 12:31

Use promises in nested maps with $q.all()

1 Answers1