From 715d94fbf959f7c9f356f44b044e99e4c8d9f6af Mon Sep 17 00:00:00 2001
From: JakkrapartXD <jakkrapart_in66@live.rmutl.ac.th>
Date: Mon, 19 Jan 2026 14:48:45 +0700
Subject: [PATCH] feat: Create course and automatically assign the creator as
 the primary instructor using a transaction.

---
 .../src/services/CoursesInstructor.service.ts | 45 ++++++++++++-------
 1 file changed, 30 insertions(+), 15 deletions(-)

diff --git a/Backend/src/services/CoursesInstructor.service.ts b/Backend/src/services/CoursesInstructor.service.ts
index 67074846..ffd09745 100644
--- a/Backend/src/services/CoursesInstructor.service.ts
+++ b/Backend/src/services/CoursesInstructor.service.ts
@@ -26,25 +26,40 @@ import {
 export class CoursesInstructorService {
     static async createCourse(courseData: CreateCourseInput, userId: number): Promise<createCourseResponse> {
         try {
-            // Map custom input to Prisma format
-            const courseCreated = await prisma.course.create({
-                data: {
-                    category_id: courseData.category_id,
-                    title: courseData.title,
-                    slug: courseData.slug,
-                    description: courseData.description,
-                    thumbnail_url: courseData.thumbnail_url,
-                    price: courseData.price || 0,
-                    is_free: courseData.is_free ?? false,
-                    have_certificate: courseData.have_certificate ?? false,
-                    created_by: userId, // Required field from JWT
-                    status: 'DRAFT' // Default status
-                }
+            // Use transaction to create course and instructor together
+            const result = await prisma.$transaction(async (tx) => {
+                // Create the course
+                const courseCreated = await tx.course.create({
+                    data: {
+                        category_id: courseData.category_id,
+                        title: courseData.title,
+                        slug: courseData.slug,
+                        description: courseData.description,
+                        thumbnail_url: courseData.thumbnail_url,
+                        price: courseData.price || 0,
+                        is_free: courseData.is_free ?? false,
+                        have_certificate: courseData.have_certificate ?? false,
+                        created_by: userId,
+                        status: 'DRAFT'
+                    }
+                });
+
+                // Add creator as primary instructor
+                await tx.courseInstructor.create({
+                    data: {
+                        course_id: courseCreated.id,
+                        user_id: userId,
+                        is_primary: true,
+                    }
+                });
+
+                return courseCreated;
             });
+
             return {
                 code: 201,
                 message: 'Course created successfully',
-                data: courseCreated
+                data: result
             };
         } catch (error) {
             logger.error('Failed to create course', { error });