topnotch_website/app/Models/Contact.php

<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Factories\HasFactory;
use Illuminate\Database\Eloquent\Model;
use Illuminate\Database\Eloquent\Relations\BelongsTo;
use Illuminate\Database\Eloquent\SoftDeletes;

class Contact extends Model
{
    use SoftDeletes, HasFactory;

    protected $fillable = [
        'customer_id',
        'first_name',
        'last_name',
        'email',
        'phone',
        'notes',
    ];

    public function getFullNameAttribute(): string
    {
        return $this->first_name . ' ' . $this->last_name;
    }

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