Baum\SetValidator::duplicatesExistForColumn PHP Метод

    protected function duplicatesExistForColumn($column)
    {
        $connection = $this->node->getConnection();
        $grammar = $connection->getQueryGrammar();
        $columns = array_merge($this->node->getQualifiedScopedColumns(), [$column]);
        $columnsForSelect = implode(', ', array_map(function ($col) use($grammar) {
            return $grammar->wrap($col);
        }, $columns));
        $wrappedColumn = $grammar->wrap($column);
        $query = $this->node->newQuery()->select($connection->raw("{$columnsForSelect}, COUNT({$wrappedColumn})"))->havingRaw("COUNT({$wrappedColumn}) > 1");
        foreach ($columns as $col) {
            $query->groupBy($col);
        }
        $result = $query->first();
        return !is_null($result);
    }