jandl-taskmanager-app/be/app/Mail/SubTaskEdited.php

<?php

namespace App\Mail;

use App\Models\SubTask;
use Illuminate\Bus\Queueable;
use Illuminate\Contracts\Queue\ShouldQueue;
use Illuminate\Mail\Mailable;
use Illuminate\Mail\Mailables\Content;
use Illuminate\Mail\Mailables\Envelope;
use Illuminate\Queue\SerializesModels;

class SubTaskEdited extends Mailable
{
    use Queueable, SerializesModels;

    public $subtask;
    public $difference;
    public $creator;

    /**
     * Create a new message instance.
     *
     * @return void
     */
    public function __construct(SubTask $subtask, array $difference)
    {
        $creator = \App\Models\User::find($subtask->created_by);
        $this->creator = ($creator) ? $creator->firstname . ' ' . $creator->lastname : '';

        $this->subtask = $subtask;
        $this->difference = $difference;
    }

    /**
     * Get the message envelope.
     *
     * @return \Illuminate\Mail\Mailables\Envelope
     */
    public function envelope()
    {
        $projectCode = $this->subtask->mastertask?->project?->code ?? 'N/A';
        $title = $this->subtask->title ?: $this->subtask->mastertask?->title ?? '';

        return new Envelope(
            subject: 'Bol editovaný Sub Task ' . $projectCode . ' - ' . $title,
        );
    }

    /**
     * Get the message content definition.
     *
     * @return \Illuminate\Mail\Mailables\Content
     */
    public function content()
    {
        return new Content(
            view: 'emails.task.sub_task_edited',
        );
    }

    /**
     * Get the attachments for the message.
     *
     * @return array
     */
    public function attachments()
    {
        return [];
    }
}