Updating $scope attributes in angularJS after post

First of all, yes i did look at other answers but they didn't do the trick for me.

I'm currently working on an angularJS based shopping application. After building the cart, creating the neccesary functions and building the view i would like to optimize the "cart" by creating an "no page refresh", add_to_cart function. So after some struggeling with functions like $scope.push and an init() load the cart function i got a bit stuck. The cart is build by the following code:

Get the cart:

$scope.getCartItems = function() {
    // Get the cart
    $http.get('config/cart/getCart.php', {cache: false}).then(function (response) {
        $scope.cartItems = [];
        $scope.cartItems = response.data.cartItems;
        $scope.totalCartItems = [];
        $scope.totalCartItems = response.data;
        $scope.selectedCustomer = [];
        $scope.selectedCustomer = response.data;
    });
};

Add a product:

$scope.addToCart = function(product, stock_available) {
    var product_id = product.id;
    var product_name = product.name.language;
    var product_price = $('span[name="combinationTotalPrice' + stock_available.id + '"]').text();
    var product_size = $('span[name="product_attributes' + stock_available.id + '"]').text();
    var product_quantity = product.quantity;
    var product_id_attribute = stock_available.id_product_attribute;

    console.log(product_id_attribute);

    var request = $http({
        method: "post",
        url: "config/cart/getCart.php?action=addToCart",
        data: {
            product_id: product_id,
            product_name: product_name,
            product_price: product_price,
            product_size: product_size,
            product_quantity: product_quantity,
            product_id_attribute: product_id_attribute
        },
        headers: {
            'Content-Type': 'application/x-www-form-urlencoded'
        }
    });
    $scope.cartItems.push(request);
};

By clicking on a button all the data is obtained from the view and passed to the addToCart() function. I've checked everything and the data gets inserted. After a hard page refresh the new product is added to the cart. But i would like to remove the "hard page refresh" and use something like i've tried above: $scope.cartItems.push(request);.

Update

So after some tips from the comments i've created a service for the cart. Take a look at the updated code:

cartService

myApp.service('cartService', ['$http',function ($http, $scope) {
    return {
        getCartItems: function() {
            return $http.get('config/cart/getCart.php', {cache: false})
        }
        // any other methods for http calls;
    }
}]);

cartController and function add

myApp.controller('CartController', function($http, $scope, cartService) {
    $scope.getTheCart = function() {
        cartService.getCartItems()
            .then(function(response) {
                $scope.cartItems = response.data.cartItems;
                $scope.totalCartItems = response.data;
                $scope.selectedCustomer = response.data;
            })
    };

$scope.addToCart = function(product, stock_available) {
        var product_id = product.id;
        var product_name = product.name.language;
        var product_price = $('span[name="combinationTotalPrice' + stock_available.id + '"]').text();
        var product_size = $('span[name="product_attributes' + stock_available.id + '"]').text();
        var product_quantity = product.quantity;
        var product_id_attribute = stock_available.id_product_attribute;

        console.log(product_id_attribute);

        var request = $http({
            method: "post",
            url: "config/cart/getCart.php?action=addToCart",
            data: {
                product_id: product_id,
                product_name: product_name,
                product_price: product_price,
                product_size: product_size,
                product_quantity: product_quantity,
                product_id_attribute: product_id_attribute
            },
            headers: {
                'Content-Type': 'application/x-www-form-urlencoded'
            }
        }).then(function() {
            $scope.getTheCart();
        });
    };
});

So everything works fine, i can even see in the network tab that the new getCart.php is obtained with the new data. Sadly still my $scope and view isn't updated.

Update 2

So i've taken a look at the example and i've tried some things for myself. After some tries i came to a very weird conclusion: Using an ng-click refreshData action refreshes the data through the following function:

$scope.refreshData = function() {
    cartService.refreshData()
        .then(function(response) {
            $scope.cartItems = response.data.cartItems;
            $scope.totalCartItems = response.data;
            $scope.selectedCustomer = response.data;
        })
};

but calling this function directly like the example in the first answer (jsFiddle) => fiddle won't refresh the view and $scope

$scope.addToCart = function(product, stock_available) {
    return cartService.addToCart(product, stock_available)
        .then(function(response) {
        console.log(response);
            $scope.cartItems = response.data.cartItems;
            $scope.totalCartItems = response.data;
            $scope.selectedCustomer = response.data;
        // call the get() function
        $scope.refreshData();
    })
};

If you have any questions please let me know in the comments

PS: creating a JSfiddle would put me back with a lot of time since all the data is obtained through the Prestashop webservice

As always, Thanks in advance!