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Eloquent Sum of Relation's Column
One of the challenges when working with an e-commerce application is retrieving aggregated data from related models. In the context of a shopping cart, you might need to determine the total cost of products added to the cart.
Let's assume the following models:
Using Eloquent's relationships, we can establish that:
To get the count of products in a user's cart, you can easily use:
Auth::user()->cart()->count();
However, calculating the total cost of products requires determining the sum of their prices. To do this with Eloquent without resorting to a raw query:
Auth::user()->products()->sum('price');
The 'products()' method retrieves all products associated with a user through the "belongsTo" and "hasMany" relationships, while the 'sum('price')' method aggregates the 'price' values from the products.
This Eloquent approach provides a clean and concise way to perform the desired operation, leveraging the power of its relationship management features.
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