silverstripe-contentreview/code/ContentReviewOwnerMigrationTask.php

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<?php
/**
* Task which migrates the ContentReview Module's SiteTree->OwnerID column to a new column name
*/
class ContentReviewOwnerMigrationTask extends BuildTask {
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/**
*
* @param SS_HTTPRequest $request
*/
public function run($request) {
$results = DB::query('SHOW columns from "SiteTree" WHERE "field" = \'OwnerID\'');
if ($results->numRecords() == 0) {
echo "<h1>No need to run task. SiteTree->OwnerID doesn't exist</h1>";
} else {
DB::query('UPDATE "SiteTree" SET "ContentReviewOwnerID" = "OwnerID"');
DB::query('UPDATE "SiteTree_Live" SET "ContentReviewOwnerID" = "OwnerID"');
DB::query('UPDATE "SiteTree_versions" SET "ContentReviewOwnerID" = "OwnerID"');
DB::query('ALTER TABLE "SiteTree" DROP COLUMN "OwnerID"');
DB::query('ALTER TABLE "SiteTree_Live" DROP COLUMN "OwnerID"');
DB::query('ALTER TABLE "SiteTree_versions" DROP COLUMN "OwnerID"');
echo "<h1>Migrated 3 tables. Dropped obsolete OwnerID column</h1>";
}
}
}