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Optimize the reviseTable() method (see #438) #487

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merged 2 commits into from May 14, 2019

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commented May 13, 2019

This PR fixes #438 by optimizing the SQL queries to purge orphan child records.

@leofeyer leofeyer self-assigned this May 13, 2019

@leofeyer leofeyer added the defect label May 13, 2019

@leofeyer leofeyer added this to the 4.4.40 milestone May 13, 2019

@leofeyer leofeyer requested a review from Toflar May 13, 2019

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Toflar approved these changes May 13, 2019

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commented May 13, 2019

Looks good to me.

I wonder if we should refactor those two parts to use a shared function now if we are making changes already. This would make later changes (e.g. if updating the FK behaviour) easier.

Something like this:

function pruneChildRecords(string $childTable, string $parentTable, bool $dynamicPtable = false) : bool {
	$condition = $dynamicPtable ? 'ptable=' . $parentTable . ' AND ' : '';
	$ids = $this->Database->execute('SELECT c.id FROM ' . $childTable . ' c LEFT JOIN ' . $parentTable. ' p ON c.pid=p.id WHERE ' . $condition . 'p.id IS NULL');

	if (!$ids->numRows) {
		return false;
	}

	return $this->Database
		->execute('DELETE FROM ' . $childTable. ' WHERE id IN(' . implode(',', array_map('\intval', $ids->fetchEach('id'))) . ')')
		->affectedRows > 0;
}

// call like
$reload |= pruneChildRecords($this->strTable, $ptable, $GLOBALS['TL_DCA'][$this->strTable]['config']['dynamicPtable']);

$reload |= pruneChildRecords($v, $this->strTable, $GLOBALS['TL_DCA'][$v]['config']['dynamicPtable']);
@m-vo

m-vo approved these changes May 13, 2019

@leofeyer leofeyer merged commit 35c682d into 4.4 May 14, 2019

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@leofeyer leofeyer deleted the hotfix/optimize-revise-table branch May 14, 2019

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