tests/phpunit/includes/Revision/McrSchemaDetection.php

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