boursecu_server/app/Models/Fund.php

<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Factories\HasFactory;
use Illuminate\Database\Eloquent\Model;
use Illuminate\Database\Eloquent\SoftDeletes;
use Rooyesh\Wallet\models\Wallet;

class Fund extends Model
{
    use HasFactory, Selector, SoftDeletes;

    protected $fillable = [
        'title',
        'file_id',
        'customer_id',
        'product_id',
    ];

    public function wallet()
    {
        return $this->hasMany(Wallet::class);
    }

    public function product()
    {
        return $this->belongsTo(Product::class, 'product_id');
    }

    public function customer()
    {
        return $this->belongsTo(Customer::class, 'customer_id');
    }
}