RainLab\Builder\Classes\TableMigrationCodeGenerator::generatePrimaryKeyDrop PHP Метод

    protected function generatePrimaryKeyDrop($table)
    {
        $index = $this->findPrimaryKeyIndex($table->getIndexes(), $table);
        if (!$index) {
            return;
        }
        $indexColumns = $index->getColumns();
        return sprintf('\\t\\t$table->dropPrimary([%s]);', $this->implodeColumnList($indexColumns)) . $this->eol;
    }