Working with AngularJS $resource: including an array element in paramDefaults

I'm currently working with the twitch.tv API and utilizing the Angular $resource factory. My goal is to access the endpoint: GET /channels/:channel. What I want to achieve is to retrieve the channel for each element within an array. I attempted using /channels/users[1], but I understand this is incorrect. Is there a way to extract the :channel information for all users in the array? Alternatively, is there a more efficient method to accomplish this task?

    (function() {
       angular.module('twitch', ['ngResource'])

       .controller('TwitchController', ['$scope', 'TwitchAPI', function($scope, TwitchAPI) {   
         $scope.getAPI = function(){
           var users = ["ESL_SC2", "OgamingSC2", "cretetion", "freecodecamp", "storbeck", "habathcx", "RobotCaleb", "noobs2ninjas"];  
           for(var i = 0; i < 8; i++){
           TwitchAPI.get({channel: users.i});
         }
       }
       $scope.online = [];
       $scope.offline = [];


  }])

  .factory('TwitchAPI', function TwitchAPIFactory($resource){
     return $resource('https://api.twitch.tv/kraken/channels/:channel', { callback: "JSON_CALLBACK" });
   });
})();

Answer №1

Initially, there is no need to utilize JSONP since the Twitch API supports CORS requests. You can set up your $resource in the following manner:

return $resource('https://api.twitch.tv/kraken/channels/:channel', {}, {
    get: {
        method: 'GET',
        headers: {
            Accept: 'application/vnd.twitchtv.v3+json',
            'Client-ID': 'Your client ID'
        }
    }
})

If you insist on using JSONP, it's important to note that you cannot include header information in the request. In this case, the format would need to be:

return $resource('https://api.twitch.tv/kraken/channels/:channel', {
    callback: 'JSON_CALLBACK',
    api_version: 3,
    client_id: 'your client ID'
}, {
    get: {
        method: 'JSONP'
    }
})

It doesn't appear possible to retrieve multiple channels at once (source: https://github.com/justintv/Twitch-API/blob/master/v3_resources/channels.md), but you can perform parallel requests.

You can generate an array of promises like this:

var promises = users.map(user => TwitchAPI.get({channel: user}).$promise);

Subsequently, you can wait for all promises to resolve using $q.all

$q.all(promises).then(channels => {
    angular.forEach(channels, channel => {
        // access each channel's properties here
        console.log('Channel name:', channel.display_name);
    });
});

Just remember to inject the $q service.

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