AngularJS 1.8: Difficulty with Custom Service Caching Data for Multiple Controllers
I've been researching this but I'm migrating some code and I tried several approaches but none seem to work... I'm working with an scenario with caching data in a custom AngularJS service that I want to share across multiple controllers. I'm using AngularJS 1.8 and created a service that fetches data from an API and stores it in a variable. The question arises when I try accessing this cached data from multiple controllers; it seems to be returning `undefined` or stale data. I expected the data to be consistent across controllers since they all depend on the same service instance. Here’s a snippet of my service: ```javascript app.service('DataService', function($http) { var cachedData = null; this.getData = function() { if (cachedData) { return Promise.resolve(cachedData); } else { return $http.get('https://api.example.com/data').then(function(response) { cachedData = response.data; return cachedData; }); } }; }); ``` I inject this service into two different controllers: ```javascript app.controller('FirstController', function($scope, DataService) { DataService.getData().then(function(data) { $scope.firstData = data; }); }); app.controller('SecondController', function($scope, DataService) { DataService.getData().then(function(data) { $scope.secondData = data; }); }); ``` When I access the data from `FirstController`, it works fine, but `SecondController` sometimes shows `undefined` or an empty object. I’ve also tried using `$timeout` to ensure the data is ready, but that didn’t help. The console behavior I see sometimes is `TypeError: want to read property 'propertyName' of undefined`. Could this be an scenario with how promises are handled in my service, or am I mismanaging the scope of the cached data? How do I ensure that the data returned is consistent between different controllers? Any ideas what could be causing this? I appreciate any insights! This is for a microservice running on macOS. Thanks for taking the time to read this!