Laravel mass change Eloquent

Question

I have the users , promocodes and users_promocodes tables. Models: User , Promocode and UserPromocode .

They are the keys of users_promocodes table: user_id -> users.id , promocode_id -> promocodes.id

And when I delete the promocode from base, I need to take away the promocode bonus. How can I set by Eloquent users.bonus ( users.bonus - 5 ) value for users, who have the users_promocodes.id = 10 ?

Answer 1

I would use Model Observers to track these kind of changes.

When PromoCodes are deleted, you can query on the users table and update as needed:

<?php

namespace App\Observers;

class PromoCodeObserver
{
    /**
     * Listen to the PromoCode Deleting event.
     *
     * @param  PromoCode $promoCode
     * @return void
     */
    public function deleting(PromoCode $promoCode)
    {
        // search for all users associated with the promo code
        // update the bonus and save changes
        $promoCode->users->each(function (User $user) { 
            $user->update(['bonus' => $user->bonus - 5]);
        });
    }
}

// User.php
public function promocode()
{
    return $this->belongsTo(PromoCode::class);
}

// PromoCode.php
public function users()
{
    return $this->hasMany(User::class);
}

Assuming a User can only have one PromoCode you'll need the above one-to-many relationship, just add a promo_code_id field on users if that is the case.