Enable editing for draft exams

database.mjs

@@ -720,8 +720,8 @@ function createRepository({ client, location, read, transaction, close }) {
       operations.push(auditOperation(log));
       await transaction(operations);
     },
-    async updateExam(exam, log) {
-      await transaction([
+    async updateExam(exam, log, replaceSubjects = false) {
+      const operations = [
         operation(
           `UPDATE exams SET
             code = ?, name = ?, description = ?, registration_start = ?, registration_end = ?,
@@ -730,9 +730,20 @@ function createRepository({ client, location, read, transaction, close }) {
           exam.code, exam.name, exam.description || '', exam.registrationStart, exam.registrationEnd,
           exam.examStart, exam.examEnd, exam.admitDownloadStart, exam.admitDownloadEnd,
           exam.location || '', exam.status, exam.id
-        ),
-        auditOperation(log)
-      ]);
+        )
+      ];
+      if (replaceSubjects) {
+        operations.push(operation('DELETE FROM exam_subjects WHERE exam_id = ?', exam.id));
+        exam.subjects.forEach((subject, index) => operations.push(operation(
+          `INSERT INTO exam_subjects (
+            id, exam_id, name, subject_date, start_time, end_time, fee, position
+          ) VALUES (?, ?, ?, ?, ?, ?, ?, ?)`,
+          subject.id, exam.id, subject.name, subject.date || String(exam.examStart).slice(0, 10),
+          subject.start || '', subject.end || '', Number(subject.fee || 0), Number(subject.order || index + 1)
+        )));
+      }
+      operations.push(auditOperation(log));
+      await transaction(operations);
     },
     async createNotice(notice, log) {
       await transaction([