MDL-45661 Assign: Clean bad data from DB after MDL-42526

Conflicts:
	mod/assign/db/upgrade.php
	mod/assign/version.php

mod/assign/db/upgrade.php

@@ -462,5 +462,14 @@ function xmldb_assign_upgrade($oldversion) {
     // Moodle v2.6.0 release upgrade line.
     // Put any upgrade step following this.
 
+    if ($oldversion < 2013110501) {
+
+        // Cleanup bad database records where assignid is missing.
+
+        $DB->delete_records('assign_user_mapping', array('assignment'=>0));
+        // Assign savepoint reached.
+        upgrade_mod_savepoint(true, 2013110501, 'assign');
+    }
+
     return true;
 }

mod/assign/version.php

@@ -25,8 +25,6 @@
 defined('MOODLE_INTERNAL') || die();
 
 $module->component = 'mod_assign'; // Full name of the plugin (used for diagnostics).
-$module->version  = 2013110500;    // The current module version (Date: YYYYMMDDXX).
+$module->version  = 2013110501;    // The current module version (Date: YYYYMMDDXX).
 $module->requires = 2013110500;    // Requires this Moodle version.
 $module->cron     = 60;
-
-