feat: update getCourseById endpoint to return single course response type and improve error handling.

Backend/src/controllers/CoursesController.ts

@@ -1,6 +1,6 @@
 import { Get, Body, Post, Route, Tags, SuccessResponse, Response, Delete, Controller, Security, Request, Put, Path, Query } from 'tsoa';
 import { ValidationError } from '../middleware/errorHandler';
-import { listCourseResponse } from '../types/courses.types';
+import { listCourseResponse, getCourseResponse } from '../types/courses.types';
 import { CoursesService } from '../services/courses.service';
 
 @Route('api/courses')
@@ -20,10 +20,15 @@ export class CoursesController {
         return await this.coursesService.ListCourses(category_id);
     }
 
+    /**
+     * ดึงข้อมูลคอร์สตาม ID
+     * Get course by ID
+     * @param id - รหัสคอร์ส / Course ID
+     */
     @Get('{id}')
     @SuccessResponse('200', 'Course fetched successfully')
-    @Response('401', 'Invalid or expired token')
-    public async getCourseById(@Path() id: number): Promise<listCourseResponse> {
-        return await this.coursesService.ListCourses(id);
+    @Response('404', 'Course not found')
+    public async getCourseById(@Path() id: number): Promise<getCourseResponse> {
+        return await this.coursesService.GetCourseById(id);
     }
 }

Backend/src/services/courses.service.ts

@@ -61,7 +61,7 @@ export class CoursesService {
             if (!course) {
                 return {
                     code: 200,
-                    message: 'Course fetched successfully',
+                    message: 'no Course fetched successfully',
                     data: null,
                 };
             }
@@ -75,7 +75,6 @@ export class CoursesService {
                     logger.warn(`Failed to generate presigned URL for thumbnail: ${err}`);
                 }
             }
-
             return {
                 code: 200,
                 message: 'Course fetched successfully',