$q.all(promises)and structure of promises object to collect the returned data

问题

I am using Angularjs $q.all(promises) to make multiple REST call and then collecting the data once promise is successful. I have following following.

1. If "promises is simple array then it works Plunker

   var promises = [
      Users.query().$promise,
      Repositories.query().$promise
   ];
   

2. If "promises" is simple object then also it works Plunker

   var promises = {
      users: Users.query().$promise,
      repos: Repositories.query().$promise
   };
   

3. If "promises" is nested object then it is not working. For my requirement I need nested object to remember the input parameters. Plunker

   var promises = {
      users: {"phx":Users.query().$promise},
      repos: {"phx":Repositories.query().$promise}
   };
   

These plunkr are just to simulate my problem. However I want this approach in real project for following requirement.

1. I have list of 12 product

2. Each product has "details", "benefits" and "offers" data

3. I have separate REST API services for "details", "benefits" and "offers" having :productID as parameter

4. I am making call in following order

   a. Loop for each cards

   b. For each card, make a REST API call for "details", "benefits" and "offers"

   c. Add #b steps into "promises" object

   d. call

   $q.all(promises).then(function(results) {
       // Here need logic to compile the result back to product 
       // and corresponding  "details", "benefits" and "offers" mapping
     } 
   

   and get the data back

Following is json structure I needed to collect my response.

{
    "prod1": {
      "benefits": {},
      "offers": {},
      "pages": {
        "productPage": {}
      }
    }
  },
  "common": {
    "benefits": {},
    "pages": {
      "commonBenefit": {}
    },
    "others": {}
  }

How can I achieve this?

回答1:

If you really need it, you can wrap the nest with $q.all like this:

var promises = {
  users: $q.all({"phx": Users.query().$promise}),
  repos: $q.all({"phx": Repositories.query().$promise})
};

plnkr.co

来源：https://stackoverflow.com/questions/29528087/q-allpromisesand-structure-of-promises-object-to-collect-the-returned-data