public function grabAttachmentMetadata($attachmentPostId)
    {
        $serializedData = $this->grabFromDatabase(
            $this->grabPostmetaTableName(),
            'meta_value',
            ['meta_key' => '_wp_attachment_metadata', 'post_id' => $attachmentPostId]
        );

        return !empty($serializedData) ?
            unserialize($serializedData)
            : [];
    }