Doctrine\ODM\MongoDB\Persisters\DocumentPersister::prepareWhereValue PHP Метод

    private function prepareWhereValue(&$fieldName, $value)
    {
        if (strpos($fieldName, '.') !== false) {
            $e = explode('.', $fieldName);

            $mapping = $this->class->getFieldMapping($e[0]);

            if ($this->class->hasField($e[0])) {
                $name = $this->class->fieldMappings[$e[0]]['name'];
                if ($name !== $e[0]) {
                    $e[0] = $name;
                }
            }

            if (isset($mapping['targetDocument'])) {
                $targetClass = $this->dm->getClassMetadata($mapping['targetDocument']);
                if ($targetClass->hasField($e[1]) && $targetClass->identifier === $e[1]) {
                    $fieldName = $e[0] . '.$id';
                    $value = $targetClass->getDatabaseIdentifierValue($value);
                } elseif ($e[1] === '$id') {
                    $value = $targetClass->getDatabaseIdentifierValue($value);
                }
            }
        } elseif ($this->class->hasField($fieldName) && ! $this->class->isIdentifier($fieldName)) {
            $name = $this->class->fieldMappings[$fieldName]['name'];
            if ($name !== $fieldName) {
                $fieldName = $name;
            }
        } else {
            if ($fieldName === $this->class->identifier || $fieldName === '_id') {
                $fieldName = '_id';
                if (is_array($value)) {
                    if (isset($value[$this->cmd.'in'])) {
                        foreach ($value[$this->cmd.'in'] as $k => $v) {
                            $value[$this->cmd.'in'][$k] = $this->class->getDatabaseIdentifierValue($v);
                        }
                    } else {
                        foreach ($value as $k => $v) {
                            $value[$k] = $this->class->getDatabaseIdentifierValue($v);
                        }
                    }
                } else {
                    $value = $this->class->getDatabaseIdentifierValue($value);
                }
            }
        }
        return $value;
    }