Exploring the power of AngularJS factory promises with the use of Pouch

Question

Exploring the power of AngularJS factory promises with the use of Pouch

After creating a service to retrieve data from a local json file, I proceeded to integrate this service with my controllers. However, I recently discovered how to fetch the same data from a pouchDB database.

$scope.healthSystems = HealthSystemData.get();

The next challenge I faced was replacing the hardcoded data path in my factory with the dynamic data from the couchDB. This involved working with promises within the service factory, a concept that I was not very familiar with.

healthSystemService.factory('HealthSystemData', ['$resource',
function($resource) {
  return $resource(***DATA FROM THE COUCHDB(a promise)***, {}, {
    get: {
      method: 'GET',
      isArray: true
    }
  });
}

If anyone could offer guidance or provide some sample code on how to effectively utilize promises in services factories, it would be greatly appreciated.

javascript angularjs promise pouchdb

Answer 1

Answer №1

Working with AngularJS resources can sometimes be tricky due to the way promises are handled, but there are ways to simplify the process.

If you want to avoid dealing with promises directly, it's recommended that your service returns a promise like this:

healthSystemService.factory('HealthSystemData', ['$q',
    function($q) {
        var db = new PouchDB('healthsystems');

        // Using $q.resolve to convert the PouchDB promise into an Angular promise
        return $q.resolve(db.get('healthsystems_list')).then(function(doc) {
            return doc.list;
        });
    }
]);

To extract the data from the promise in your controller, use the .then() method like so:

HealthySystemData.then(function (data) {
    $scope.healthSystems = data;
});

Answer 2

Working with AngularJS resources can sometimes be tricky due to the way promises are handled, but there are ways to simplify the process.

If you want to avoid dealing with promises directly, it's recommended that your service returns a promise like this:

healthSystemService.factory('HealthSystemData', ['$q',
    function($q) {
        var db = new PouchDB('healthsystems');

        // Using $q.resolve to convert the PouchDB promise into an Angular promise
        return $q.resolve(db.get('healthsystems_list')).then(function(doc) {
            return doc.list;
        });
    }
]);

To extract the data from the promise in your controller, use the .then() method like so:

HealthySystemData.then(function (data) {
    $scope.healthSystems = data;
});

Exploring the power of AngularJS factory promises with the use of Pouch

Answer №1

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