as3io / modlr-persister-mongodb

     * @param   EntityMetadata  $metadata

     * @return  array|null

     */

    private function formatQueryElementId($key, $value, EntityMetadata $metadata)

    {

        if (false === $this->isIdentifierField($key)) {

            return;

        }

        $dbIdKey = Persister::IDENTIFIER_KEY;

        $converter = $this->getQueryIdConverter($metadata);

        if (is_array($value)) {

            $value = (true === $this->hasOperators($value)) ? $value : ['$in' => $value];

            return [$dbIdKey, $this->formatQueryExpression($value, $converter)];

        }

        return [$dbIdKey, $converter($value)];

    }

    /**

     * Formats a relationship query element.

     * @param   mixed   $value

     * @return  array|null

     */

    private function formatQueryElementType($key, $value)

    {

        if (false === $this->isTypeField($key)) {

            return;

        }

        $dbTypeKey = Persister::POLYMORPHIC_KEY;

        $converter = $this->getQueryTypeConverter();

        if (is_array($value)) {

            $value = (true === $this->hasOperators($value)) ? $value : ['$in' => $value];

            return [$dbTypeKey, $this->formatQueryExpression($value, $converter)];

        }

        return [$dbTypeKey, $converter($value)];

    }

    /**

     * Formats a query expression.