The value of the variable in the controller is not being successfully assigned the data that is resolved

//in a PService module

this.fetchTypes = function(){
        var types = PTypesFactory.retrieve({});
        return types.$promise.then(function(result)
        {
            console.log(result.groups);
            return result.groups;
        });
    }

//inside a controller

$scope.groupsData = PService.fetchTypes();

After correctly fetching the REST data and logging it with:

console.log($scope.groupsData);

I am getting:

Object {then: function, catch: function, finally: function}

This actually returns the Promise API instead of the resolved data.

Answer №1

The issue lies in attempting to use an asynchronous function as if it were synchronous.

then is a method that returns a promise.

When calling it with a callback, the callback will not be executed immediately; rather, it will only run once the response is received from the server.

You can refactor the code like this:

Service

this.getPTypes = function(callback){
  PTypesFactory.get({}).then(callback);
}

Controller

PService.getPTypes(function(res){
  $scope.groups = res.data;
});

Answer №2

Using promises is essential for managing asynchronous tasks. When you use the then method, the function provided will execute at an unknown time in the future. You cannot directly return a value from this function to another part of the code execution.

Instead of chaining then calls in your service, simply return the promise:

this.fetchData = function(){
    return DataFactory.fetch({}).$promise;
}

Then handle the resolved promise in the controller:

$scope.data = DataService.fetchData().then(function(response) {
    console.log(response.data);
});

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