tests/phpunit/includes/Revision/McrSchemaDetection.php

   1 <?php
   2
   3 namespace MediaWiki\Tests\Revision;
   4
   5 use Wikimedia\Rdbms\IDatabase;
   6
   7 /**
   8  * Trait providing methods for detecting which MCR schema migration phase the current schema
   9  * is compatible with.
  10  */
  11 trait McrSchemaDetection {
  12
  13         /**
  14          * Returns true if MCR-related tables exist in the database.
  15          * If yes, the database is compatible with with MIGRATION_NEW.
  16          * If hasPreMcrFields() also returns true, the database supports MIGRATION_WRITE_BOTH mode.
  17          *
  18          * @param IDatabase $db
  19          * @return bool
  20          */
  21         protected function hasMcrTables( IDatabase $db ) {
  22                 return $db->tableExists( 'slots', __METHOD__ );
  23         }
  24
  25         /**
  26          * Returns true if pre-MCR fields still exist in the database.
  27          * If yes, the database is compatible with with MIGRATION_OLD mode.
  28          * If hasMcrTables() also returns true, the database supports MIGRATION_WRITE_BOTH mode.
  29          *
  30          * Note that if the database has been updated in MIGRATION_NEW mode,
  31          * the rev_text_id field will be 0 for new revisions. This means that
  32          * in MIGRATION_OLD mode, reading such revisions will fail, even though
  33          * all the necessary fields exist.
  34          * This is not relevant for unit tests, since unit tests reset the database content anyway.
  35          *
  36          * @param IDatabase $db
  37          * @return bool
  38          */
  39         protected function hasPreMcrFields( IDatabase $db ) {
  40                 return $db->fieldExists( 'revision', 'rev_content_model', __METHOD__ );
  41         }
  42
  43 }