Oh no, an error has occurred in AngularJS: "TypeError: Unable to access the 'reduce' property of undefined

My question may sound a bit unusual, but I am facing a rather strange problem.

I have been using javascript's .map and .reduce functions to create custom search filters in my scope examples. Here is an example of the code I have been working on:

$http.get('config/get/getOrders.php', {cache: true}).then(function(response){
        $scope.orders = response.data.orders.order;
        $scope.orders.map( function addPlace(item) {
            item.firstname = $scope.customers.reduce(function(a,customers){
                return item.id_customer === customers.id ? customers.firstname : a;
            }, '');
            return item;
        });
    });

In the $http.get(), I am fetching a JSON file containing order data. Each order has an id_customer value, which corresponds to the customer who placed the order.

I wanted to enhance the search function by including the customer name. For more information on this topic, you can refer to the question I posted yesterday.

Initially, it worked fine as the filter was able to search based on customer_firstname. However, when I tried to apply a similar function in another controller with different scopes, I encountered a confusing error:

TypeError: Cannot read property 'reduce' of undefined
. Despite checking all the necessary data and configurations, such as $scope.products, $scope.stock_availables, and $scope.productCombinations, I cannot seem to figure out why this issue is arising.

$http.get('config/get/getProducts.php', {cache: true}).then(function(response){
    $scope.products = response.data.products.product;
    $scope.products.map( function addPlace(item) {
        item.eanCombination = $scope.productCombinations.reduce(function(a, productCombinations, stock_availables){
            return item.id === stock_availables.id + stock_availables.id === stock_availables.id_product_attribute + stock_availables.id_product_attribute === productCombinations.id ? productCombinations.ean13: a;
        }, '');
        return item;
    });
});

Summary: The function works in one controller but not in another.

If you have any inquiries, feel free to ask in the comments section.

Thank you in advance!

Answer №1

It turns out I had a small error in the order in which my data was being loaded. The $scope.productCombinations was actually being loaded after the products sequence, causing issues. Lesson learned: always double check the order of your code!

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