Nette\Database\Structure::analyzeForeignKeys PHP Method

    protected function analyzeForeignKeys(&$structure, $table)
    {
        $lowerTable = strtolower($table);
        foreach ($this->connection->getSupplementalDriver()->getForeignKeys($table) as $row) {
            $structure['belongsTo'][$lowerTable][$row['local']] = $row['table'];
            $structure['hasMany'][strtolower($row['table'])][$table][] = $row['local'];
        }
        if (isset($structure['belongsTo'][$lowerTable])) {
            uksort($structure['belongsTo'][$lowerTable], function ($a, $b) {
                return strlen($a) - strlen($b);
            });
        }
    }