Phalcon\Mvc\MongoCollection::delete PHP Method

    public function delete()
    {
        if (!($id = $this->_id)) {
            throw new Exception("The document cannot be deleted because it doesn't exist");
        }
        $disableEvents = self::$_disableEvents;
        if (!$disableEvents) {
            if (false === $this->fireEventCancel("beforeDelete")) {
                return false;
            }
        }
        if (true === $this->_skipped) {
            return true;
        }
        $connection = $this->getConnection();
        $source = $this->getSource();
        if (empty($source)) {
            throw new Exception("Method getSource() returns empty string");
        }
        /**
         * Get the Collection
         *
         * @var AdapterCollection $collection
         */
        $collection = $connection->selectCollection($source);
        if (is_object($id)) {
            $mongoId = $id;
        } else {
            if ($this->_modelsManager->isUsingImplicitObjectIds($this)) {
                $mongoId = new ObjectID($id);
            } else {
                $mongoId = $id;
            }
        }
        $success = false;
        /**
         * Remove the instance
         */
        $status = $collection->deleteOne(['_id' => $mongoId], ['w' => true]);
        if ($status->isAcknowledged()) {
            $success = true;
            $this->fireEvent("afterDelete");
        }
        return $success;
    }