Issue with retrieving authentication object from service within resolve function in AngularJS

I am facing a challenge where I need to retrieve certain data before the page renders to prevent it from appearing empty initially. However, I am encountering difficulties in getting my resolve function to work as intended.

The issue lies in the line where I call states.getAuth() as it throws an error stating that states.getAuth() is undefined. Strangely enough, this function successfully returns authentication information about the user when used in my controllers but fails to do so within this resolve block.

Could it be that my approach to this problem is incorrect? Since I have never had to implement a resolve in this manner before, I am seeking guidance on the best way to proceed.

Please advise me if you require additional information about my services or if the provided route snippet is sufficient for resolving the issue.

.when('/programs/:program', {
  templateUrl: 'views/pages/single-program.html',
  resolve: {
    'isAuth': ['fbRefs', function(fbRefs) {
      return fbRefs.getAuthObj().$requireAuth();
    }],
    'programData': ['$route', 'fbRefs', 'states', function($route, fbRefs, states) {

      // Extract the program key from $routeParams
      var key = $route.current.params.program;

      // Retrieve the unique user id
      var uid = states.getAuth().uid; // This line is causing an error

      // Define the path to fetch program data
      var path = uid + '/programs/' + key;

      // Fetch the program data from Firebase
      var program = fbRefs.getSyncedObj(path).$loaded();

      return program;
    }]
  }
})

Below is the states service code as requested:

auth.service('states', [function() {

  var auth;

  return {
    getAuth: function() {
      return auth;
    },
    setAuth: function(state) {
      auth = state;
    }
  };
}]);

Answer №1

Your implementation of the 'Service Recipe' for the states service is currently functioning more like a 'Factory Recipe' instead.

For more information, refer to the following documentation: https://docs.angularjs.org/guide/providers#service-recipe

To correct this, you can choose between the following approaches:

auth.factory('states', [function() {

  var auth;

  return {
    getAuth: function() {
      return auth;
    },
    setAuth: function(state) {
      auth = state;
    }
  };
}]);

Or alternatively:

auth.service('states', [function() {

  var auth;

  this.getAuth = function() {
      return auth;
  };

  this.setAuth = function(state) {
      auth = state;
  };
}]);

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