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<?php
namespace MediaWiki\Tests\Revision;
use Wikimedia\Rdbms\IDatabase;
/**
* Trait providing methods for detecting which MCR schema migration phase the current schema
* is compatible with.
*/
trait McrSchemaDetection {
/**
* Returns true if MCR-related tables exist in the database.
* If yes, the database is compatible with with MIGRATION_NEW.
* If hasPreMcrFields() also returns true, the database supports MIGRATION_WRITE_BOTH mode.
*
* @param IDatabase $db
* @return bool
*/
protected function hasMcrTables( IDatabase $db ) {
return $db->tableExists( 'slots', __METHOD__ );
}
/**
* Returns true if pre-MCR fields still exist in the database.
* If yes, the database is compatible with with MIGRATION_OLD mode.
* If hasMcrTables() also returns true, the database supports MIGRATION_WRITE_BOTH mode.
*
* Note that if the database has been updated in MIGRATION_NEW mode,
* the rev_text_id field will be 0 for new revisions. This means that
* in MIGRATION_OLD mode, reading such revisions will fail, even though
* all the necessary fields exist.
* This is not relevant for unit tests, since unit tests reset the database content anyway.
*
* @param IDatabase $db
* @return bool
*/
protected function hasPreMcrFields( IDatabase $db ) {
return $db->fieldExists( 'revision', 'rev_content_model', __METHOD__ );
}
}
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