nanosanteservice/app/Models/NhInsurancesInvoice.php

<?php

/**
 * Created by Reliese Model.
 */

namespace App\Models;

use Carbon\Carbon;
use Illuminate\Database\Eloquent\Model;

class NhInsurancesInvoice extends Model
{
    protected $table = 'nh_insurances_invoices';

    protected $casts = [
        'insurance_id' => 'int',
        'subscription_id' => 'int',
        'deadline_number' => 'int'
    ];

    protected $guarded = ['id'];
    protected $appends = ['paid_amount_non_formatted'];

    public function insurance()
    {
        return $this->belongsTo(NhInsurance::class, 'insurance_id');
    }

    public function subscription()
    {
        return $this->belongsTo(NhInsurancesSubscription::class, 'subscription_id');
    }

    public function payments()
    {
        return $this->hasMany(NhInsurancesPayment::class, 'invoice_id');
    }

    public function getPaidAmountNonFormattedAttribute()
    {
        return $this->payments()->sum('amount');
    }
}