App\Libraries\HistoryUtils::trackViewed PHP Method

    public static function trackViewed(EntityModel $entity)
    {
        $entityType = $entity->getEntityType();
        $trackedTypes = [ENTITY_CLIENT, ENTITY_INVOICE, ENTITY_QUOTE, ENTITY_TASK, ENTITY_EXPENSE];
        if (!in_array($entityType, $trackedTypes)) {
            return;
        }
        $object = static::convertToObject($entity);
        $history = Session::get(RECENTLY_VIEWED) ?: [];
        $accountHistory = isset($history[$entity->account_id]) ? $history[$entity->account_id] : [];
        $data = [];
        // Add to the list and make sure to only show each item once
        for ($i = 0; $i < count($accountHistory); $i++) {
            $item = $accountHistory[$i];
            if ($object->url == $item->url) {
                continue;
            }
            array_push($data, $item);
            if (isset($counts[$item->accountId])) {
                $counts[$item->accountId]++;
            } else {
                $counts[$item->accountId] = 1;
            }
        }
        array_unshift($data, $object);
        if (isset($counts[$entity->account_id]) && $counts[$entity->account_id] > RECENTLY_VIEWED_LIMIT) {
            array_pop($data);
        }
        $history[$entity->account_id] = $data;
        Session::put(RECENTLY_VIEWED, $history);
    }

 public function authorize()
 {
     if ($this->entity()) {
         if ($this->user()->can('view', $this->entity())) {
             HistoryUtils::trackViewed($this->entity());
             return true;
         }
     } else {
         return $this->user()->can('create', $this->entityType);
     }
 }