TagService.js

'use strict';

angular.module('instangApp')
.service('TagService', function TagService($http, $q, $angularCacheFactory, Nginsta) {
  // AngularJS will instantiate a singleton by calling "new" on this function

  var cache = $angularCacheFactory('tagCache', {
    maxAge: 3600000
  });

  return {

    createTag: function(data) {
      var deferred = $q.defer();
      $http.post(Nginsta.url('/api/tags'), { tag: data })
      .success(function(data, status, headers, config) {
        var tag = data.tag;
        cache.put(data.tag.id, data.tag);
        deferred.resolve(data.tag);
      })
      .error(function(data, status, headers, config) {
        deferred.reject(data); 
      });

      return deferred.promise;
    }, 

    deleteById: function(id) {
      var deferred = $q.defer();

      $http.delete(Nginsta.url('/api/tags/'+id))
      .success(function(data, status, headers, config) {
        console.log(data);
        deferred.resolve(data);
      })
      .error(function(data, status, headers, config) { 
        console.log(data);
        deferred.reject(data);
      });

      return deferred.promise;

    }, 

    getById: function (id) {
      var deferred = $q.defer();
      if (cache.get(id)) {
        console.log("Already had in cache.");
        deferred.resolve(cache.get(id));
      }
      else {
        console.log("Did not have cache.");
        $http.get(Nginsta.url('/api/tags/' + id))
        .success(function(data, status, headers, config) {
          console.log("Da data!", data);
          cache.put(id, data.tag);
          deferred.resolve(data.tag);
        })
        .error(function(data, status, headers, config) {
          deferred.reject(data);
        })
      }

      return deferred.promise;
    }
  };

});