invoiceninja/app/Models/InvoiceInvitation.php

<?php
/**
 * Invoice Ninja (https://invoiceninja.com)
 *
 * @link https://github.com/invoiceninja/invoiceninja source repository
 *
 * @copyright Copyright (c) 2020. Invoice Ninja LLC (https://invoiceninja.com)
 *
 * @license https://opensource.org/licenses/AAL
 */

namespace App\Models;

use App\Models\Invoice;
use App\Utils\Traits\Inviteable;
use App\Utils\Traits\MakesDates;

use Illuminate\Database\Eloquent\SoftDeletes;
use Illuminate\Support\Carbon;

class InvoiceInvitation extends BaseModel {
	use MakesDates;
	use SoftDeletes;
	use Inviteable;

	protected $fillable = [
		//'key',
		//'client_contact_id',
	];

	protected $with = [
		//    'company',
	];

	public function entityType() {
		return Invoice::class ;
	}

	/**
	 * @return mixed
	 */
	public function invoice() {
		return $this->belongsTo(Invoice::class )->withTrashed();
	}

	/**
	 * @return mixed
	 */
	public function contact() {
		return $this->belongsTo(ClientContact::class , 'client_contact_id', 'id')->withTrashed();
	}

	/**
	 * @return mixed
	 */
	public function user() {
		return $this->belongsTo(User::class )->withTrashed();
	}

	/**
	 * @return \Illuminate\Database\Eloquent\Relations\BelongsTo
	 */
	public function company() {
		return $this->belongsTo(Company::class );
	}

	public function signatureDiv() {
		if (!$this->signature_base64) {
			return false;
		}

		return sprintf('<img src="data:image/svg+xml;base64,%s"></img><p/>%s: %s', $this->signature_base64, ctrans('texts.signed'), $this->createClientDate($this->signature_date, $this->contact->client->timezone()->name));
	}

	public function getName() {
		return $this->key;
	}

	public function markViewed() {
		$this->viewed_date = Carbon::now();
		$this->save();
	}
}