How to Calculate the Total Price of Items in a User\'s Cart with Eloquent?

Eloquent: Retrieving Sum of Related Model's Column

In the context of a shopping cart application, you have three models: User, Product, and Cart. The Cart model has a user_id and a product_id, while the Product model has a price column. To determine the total value of products in a user's cart, you can utilize Laravel's Eloquent relationships.

To obtain the sum of the prices for products associated with the current user's carts, use the following Eloquent expression:

<code class="php">Auth::user()->products->sum('price');</code>

This expression retrieves the sum of the price column for all products related to the current user's carts. Eloquent provides a variety of aggregate methods, including sum(), avg(), and count(), allowing you to perform complex calculations on related models without writing explicit queries.

By leveraging Eloquent's aggregate methods, you can access and manipulate data from related tables effectively, providing a more concise and intuitive approach compared to using raw SQL queries.

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