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  1. Moodle
  2. MDL-75696

Errors when restoring pre-4.0 quiz backups




      While restoreing a course backup from moodle 2.* to moodle 4.* i observed the following error:

      with debugging enabled the error is:

      ERROR: null value in column "questionbankentryid" of relation "mdl_question_references" violates not-null constraint
      DETAIL: Failing row contains (57, 328328, mod_quiz, slot, 142, null, null).
      INSERT INTO mdl_question_references (usingcontextid,component,questionarea,itemid,questionbankentryid,version) VALUES($1,$2,$3,$4,$5,$6) RETURNING id
      [array (
      'usingcontextid' => 328328,
      'component' => 'mod_quiz',
      'questionarea' => 'slot',
      'itemid' => 142,
      'questionbankentryid' => NULL,
      'version' => NULL,
      Error code: dmlwriteexception 
      line 489 of /lib/dml/moodle_database.php: dml_write_exception thrown
      line 329 of /lib/dml/pgsql_native_moodle_database.php: call to moodle_database->query_end()
      line 1113 of /lib/dml/pgsql_native_moodle_database.php: call to pgsql_native_moodle_database->query_end()
      line 1161 of /lib/dml/pgsql_native_moodle_database.php: call to pgsql_native_moodle_database->insert_record_raw()
      line 357 of /mod/quiz/backup/moodle2/restore_quiz_stepslib.php: call to pgsql_native_moodle_database->insert_record()
      line 414 of /mod/quiz/backup/moodle2/restore_quiz_stepslib.php: call to restore_quiz_activity_structure_step->process_quiz_question_legacy_instance()
      line 137 of /backup/util/plan/restore_structure_step.class.php: call to restore_quiz_activity_structure_step->process_quiz_question_instance()
      line 121 of /backup/util/helper/restore_structure_parser_processor.class.php: call to restore_structure_step->process()
      line 178 of /backup/util/xml/parser/processors/grouped_parser_processor.class.php: call to restore_structure_parser_processor->dispatch_chunk()
      line 109 of /backup/util/helper/restore_structure_parser_processor.class.php: call to grouped_parser_processor->postprocess_chunk()
      line 148 of /backup/util/xml/parser/processors/simplified_parser_processor.class.php: call to restore_structure_parser_processor->postprocess_chunk()
      line 92 of /backup/util/xml/parser/processors/progressive_parser_processor.class.php: call to simplified_parser_processor->process_chunk()
      line 190 of /backup/util/xml/parser/progressive_parser.class.php: call to progressive_parser_processor->receive_chunk()
      line 278 of /backup/util/xml/parser/progressive_parser.class.php: call to progressive_parser->publish()
      line ? of unknownfile: call to progressive_parser->end_tag()
      line 179 of /backup/util/xml/parser/progressive_parser.class.php: call to xml_parse()
      line 158 of /backup/util/xml/parser/progressive_parser.class.php: call to progressive_parser->parse()
      line 110 of /backup/util/plan/restore_structure_step.class.php: call to progressive_parser->process()
      line 181 of /backup/util/plan/base_task.class.php: call to restore_structure_step->execute()
      line 219 of /backup/moodle2/restore_activity_task.class.php: call to base_task->execute()
      line 191 of /backup/util/plan/base_plan.class.php: call to restore_activity_task->execute()
      line 168 of /backup/util/plan/restore_plan.class.php: call to base_plan->execute()
      line 408 of /backup/controller/restore_controller.class.php: call to restore_plan->execute()
      line 219 of /backup/util/ui/restore_ui.class.php: call to restore_controller->execute_plan()
      line 144 of /backup/restore.php: call to restore_ui->execute()

      After further investigation the problem is that in
      $question = $DB->get_record_sql($sql, [$questionid]); line $question might be bool type false.
      but after that line $question is not checled just used as if is were an array. And in line $questionreference->questionbankentryid = $question->questionbankentryid; $question->questionbankentryid is false->questionbankentryid which is undef, which will be null in the sql insert in $DB->insert_record('question_references', $questionreference); line.

      Additionally, while testing a lot of PHP Warnings "Undefined array key 1" were emitted. This is due to various version checks using restore_controller::info::moodle_release rather than moodle_version when comparing to a YYYYMMDD version number to decide whether to perform conversion from old data structures during the restore.


        Issue Links



              marxjohnson Mark Johnson
              okigye Endre Attila Győry
              Tim Hunt Tim Hunt
              Andrew Lyons Andrew Lyons
              CiBoT CiBoT
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