How to Calculate the Total Sum of Product Prices in a User\'s Cart Using Laravel Eloquent?

Calculating the Total Sum of Product Prices in a User's Cart Using Laravel Eloquent

In Laravel, calculating the sum of a column value of related models can be achieved using the sum() method. In this context, we have a User model with many Carts and each Cart belongs to a User and has many Products. The Cart table only contains columns for identifying the user, product, and timestamps.

To calculate the total sum of product prices in a user's cart, we can use the following Eloquent code:

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

Here's how this code achieves the desired result:

• Auth::user(): This retrieves the currently authenticated user object.
• ->products: This accesses the products relationship defined in the User model. Since each user can have multiple products in their cart, this relationship returns a collection of Product models.
• ->sum('price'): This applies the sum() method to the collection of Product models, aggregating the price column values of all the products in the user's cart. The result is a single numerical value representing the total sum of prices.

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