Migration: fix to optimise migration of attendances when having a lot of attendances to migrate - refs BT#20864

src/CoreBundle/Migrations/Schema/V200/Version20201216110722.php

@@ -31,6 +31,25 @@ final class Version20201216110722 extends AbstractMigrationChamilo
 
         $q = $this->entityManager->createQuery('SELECT c FROM Chamilo\CoreBundle\Entity\Course c');
 
+        // The title of the attendance table is used to create the slug in the resource_node tbale.
+        // Before creating a new registry in resource_node, Doctrine is looking for all the registries that start with the same name
+        // It then find the last one depending on the name and create new one with the "title-number" 
+        // where title is the title of the attendance and the number is the max number all ready existing + 1
+        // Since in Chamilo 1.11.x the name of the first attendance is created automatically we have a lot of attendance with the same name
+        // This make the migration to take a really long time if we have many attendance because this process is taking more and more time
+        // when creating more registry with the same name.
+        // So to avoid this process taking so much time :
+        // * Save temporarly the title and the id of all the attendance in a PHP Array
+        // * we modify the title of the attendance to make it unique during the migration by adding the iid at the end
+        // * We then process the migration
+        // * At the end we restore the title without the iid and also the resource_node.title
+
+        $sql = "SELECT iid, title FROM c_attendance";
+        $result = $this->connection->executeQuery($sql);
+        $attendancesBackup = $result->fetchAllAssociative();
+        $sqlUpdateTitle = "UPDATE c_attendance SET title = CONCAT(title, '-', iid)";
+        $resultUpdate = $this->connection->executeQuery($sqlUpdateTitle);
+
         /** @var Course $course */
         foreach ($q->toIterable() as $course) {
             $courseId = $course->getId();
@@ -67,5 +86,12 @@ final class Version20201216110722 extends AbstractMigrationChamilo
                 $this->entityManager->flush();
             }
         }
+        // Restoring attendance title and resource_node title
+        foreach ($attendancesBackup as $attendance) {
+            $sqlRestoreAttendance = "UPDATE c_attendance SET title = '{$attendance['title']}' where iid = {$attendance['iid']}";
+            $resultUpdate = $this->connection->executeQuery($sqlRestoreAttendance);
+            $sqlUpdateResourceNode = "UPDATE resource_node SET title = '{$attendance['title']}' where id in (SELECT resource_node_id FROM c_attendance where iid = {$attendance['iid']})";
+            $resultUpdate = $this->connection->executeQuery($sqlUpdateResourceNode);
+        }
     }
 }