How to Calculate the Sum of Product Prices in a Laravel Shopping Cart using Eloquent?

Calculating Sum of Related Column Values in Laravel Eloquent

In a shopping cart application, you may need to calculate the sum of product prices based on the products in a user's cart. This article explains how to accomplish this using Eloquent, without resorting to raw queries.

A typical shopping cart scenario involves three models: User, Product, and Cart. The Cart model contains columns for the ID, user ID, product ID, and timestamps. The UserModel has a hasMany relationship with Carts, while the CartModel has a belongsTo relationship with User and a hasMany relationship with Products.

To calculate the total number of products in the cart, you can use Auth::user()->cart()->count(). However, to get the sum of product prices, you can use the following Eloquent expression:

Auth::user()->products->sum('price')

This code uses the sum() method from the Collection class, which is available after establishing the products relationship. The sum() method calculates the sum of the specified column, in this case, the price column from the Product model.

By leveraging Eloquent's expressive querying capabilities, you can easily perform complex calculations and aggregations on your data without the need for raw SQL queries.

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