Activity.php

<?php

namespace App;

use Modules\Forum\Entities\ReplyWithThread;
use Spatie\Activitylog\Models\Activity as BaseActivity;

class Activity extends BaseActivity
{
    private $morphRelationModels = [
        'replies' => ReplyWithThread::class
    ];

    public function getSubjectTypeAttribute($value)
    {
        if (is_null($value)) return ($value);

        if (array_key_exists($value, $this->morphRelationModels)){
            return $this->morphRelationModels[$value];
        }

        return $value;
    }

    public function getSubjectDescriptionAttribute()
    {
        switch ($this->getSubjectType()){
            case 'replies':
                return __('Replied to the thread').$this->generateLink(
                        route('forum.threads.show', ['slug' => $this->subject->thread->slug]),
                        $this->subject->thread->title
                    );
                break;
            case 'threads':
                return __('Created the thread').$this->generateLink(
                        route('forum.threads.show', ['slug' => $this->subject->slug]),
                        $this->subject->slug
                    );
                break;
            default:
                return '';
        }
    }

    private function getSubjectType(): string
    {
        $subjectType = $this->subject_type;
        $relationModels = array_flip($this->morphRelationModels);

        if (array_key_exists($subjectType, $relationModels)){
            $subjectType = $relationModels[$subjectType];
        }

        return $subjectType;
    }

    private function generateLink(string $url, string $title): string
    {
        return sprintf(
            ' <a href="%s">%s</a>',
            $url,
            $title
        );
    }
}