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

Calculating the Total Price of Products in a User's Cart

In Laravel Eloquent, accessing and modifying related models is a breeze. One common scenario is calculating the totals of related models, such as the sum of product prices in a user's cart.

To achieve this task, you can leverage the power of Eloquent's relationship methods. In this case, a User has a hasMany relationship with Cart, and a Cart belongsTo User.

Solution:

To calculate the total price of products in a user's cart using Eloquent, you simply need to chain the following methods:

<code class="php">Auth::user()->carts()
            ->where('user_id', Auth::user()->id)
            ->join('products', 'product_id', '=', 'products.id')
            ->sum('price');</code>

Explanation:

1. Auth::user(): Get the currently authenticated user.
2. carts(): Get the carts associated with the user.
3. where('user_id', Auth::user()->id): Filter the carts to only include those belonging to the current user.
4. join('products', 'product_id', '=', 'products.id'): Join the cart table with the products table using the product_id column.
5. sum('price'): Calculate the sum of the price column in the products table, which represents the total price of products in the cart.

This approach allows you to access the aggregate functions available in Laravel Eloquent's Collection methods, including sum(), count(), and avg().

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