我应该在哪里将价格计算逻辑放在Laravel中？ [关闭]

Question

In this question I am asking for "best practice" advice for Laravel.
I am working on an "airbnb-like" website where I list accommodations. On various pages in the site (backend and frontend) I need to calculate the price for the accommodations. The price is calculated by combining the accommodation object with the search query.

Eg.
-accommodation: rate = 50 euro per night
-search query: 4 nights
-> result: total price = 200 euro

Where should I put the logic that makes these price calculation?
For example:
-Should I create a PricesController for this?
-Should I add functions/methods to the AccommodationsController that calculate this, or to the Accommodation model?
-Should I create a ServiceProvider for this?

Answer 1

There's no defined way to pull this off, which in my opinion is the greatest thing about laravel.

Maybe create a directory named Calculations in app/ (app/Caclulations/Accommodation.php), and namespace it as such? It would be an nice object oriented approach to this problem.

namespace App\Calculations;

class Accommodation
{
    /**
     * The rate per night.
     *
     * @var float
     */
    protected $rate;

    /**
     * The amount of nights for the stay.
     *
     * @var int
     */
    protected $nights = 1;

    /**
     * Constructor.
     *
     * @param float $rate
     * @param int   $nights
     */
    public function __construct($rate = 50.00, $nights = 1)
    {
        $this->rate = $rate;
        $this->nights = $nights;
    }

    /**
     * Calculates the accommodation and returns the result.
     *
     * @return float
     */
    public function calculate()
    {
        return $this->rate * $this->nights;
    }
}

This way you can modify the calculation class if the calculation changes, extend it from other calculations (such as a base calculation), and maybe insert some other useful things in the class such as currency type.

Usage:

$total = (new Accommodation($rate, $nights))->calculate();