silverstripe-cms/code/Tasks/MigrateSiteTreeLinkingTask.php

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<?php
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namespace SilverStripe\CMS\Tasks;
use SilverStripe\CMS\Model\SiteTree;
use SilverStripe\Dev\BuildTask;
use SilverStripe\Dev\Debug;
use SilverStripe\ORM\DB;
use SilverStripe\Versioned\Versioned;
/**
* Updates legacy SiteTree link tracking into new polymorphic many_many relation.
* This should be done for any site upgrading to 4.2.0
*/
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class MigrateSiteTreeLinkingTask extends BuildTask
{
private static $segment = 'MigrateSiteTreeLinkingTask';
protected $title = 'Migrate SiteTree Linking Task';
protected $description = 'Updates legacy SiteTree link tracking into new polymorphic many_many relation';
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public function run($request)
{
// Ensure legacy table exists
$exists = DB::get_conn()->getSchemaManager()->hasTable('SiteTree_LinkTracking');
if (!$exists) {
DB::alteration_message("Table SiteTree_LinkTracking has already been migrated, or doesn't exist");
return;
}
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$pages = 0;
// Ensure sync occurs on draft
Versioned::withVersionedMode(function () use (&$pages) {
Versioned::set_stage(Versioned::DRAFT);
/** @var SiteTree[] $linkedPages */
$linkedPages = SiteTree::get()
->innerJoin(
'SiteTree_LinkTracking',
'"SiteTree_LinkTracking"."SiteTreeID" = "SiteTree"."ID"'
);
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foreach ($linkedPages as $page) {
// Command page to update symlink tracking
$page->syncLinkTracking();
$pages++;
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}
});
DB::alteration_message("Migrated page links on " . SiteTree::singleton()->i18n_pluralise($pages));
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// Disable table to prevent double-migration
DB::dont_require_table('SiteTree_LinkTracking');
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}
}