write CourseController.java

src/main/java/com/backend/elearning/domain/classroom/ClassroomController.java

@@ -26,6 +26,15 @@ public ResponseEntity<ClassroomVM> create (
         return ResponseEntity.ok().body(classroomVM);
     }
 
+    @PostMapping("/classrooms/{classroomId}")
+    public ResponseEntity<ClassroomVM> update (
+            @RequestBody ClassroomPostVM classroomPostVM,
+            @PathVariable("classroomId") Long classroomId
+    ) {
+        ClassroomVM classroomVM = classroomService.update(classroomPostVM, classroomId);
+        return ResponseEntity.ok().body(classroomVM);
+    }
+
     @GetMapping("/classrooms/course/{courseId}")
     public ResponseEntity<List<ClassroomVM>> getByCourseId (
             @PathVariable("courseId") Long courseId

src/main/java/com/backend/elearning/domain/classroom/ClassroomService.java

@@ -5,6 +5,8 @@
 public interface ClassroomService {
 
     ClassroomVM create(ClassroomPostVM classroomPostVM);
+
+    ClassroomVM update(ClassroomPostVM classroomPostVM, Long classroomId);
     List<ClassroomVM> getByCourseId(Long courseId);
 
     ClassroomGetVM getById(Long id);

src/main/java/com/backend/elearning/domain/classroom/ClassroomServiceImpl.java

@@ -48,6 +48,17 @@ public ClassroomVM create(ClassroomPostVM classroomPostVM) {
         return ClassroomVM.fromModel(savedClassroom);
     }
 
+    @Override
+    public ClassroomVM update(ClassroomPostVM classroomPostVM, Long classroomId) {
+
+        Classroom classroom = classroomRepository.findById(classroomId).orElseThrow();
+        classroom.setName(classroom.getName());
+        classroom.setDescription(classroomPostVM.description());
+
+        Classroom updatedClassroom = classroomRepository.save(classroom);
+        return ClassroomVM.fromModel(updatedClassroom);
+    }
+
     @Override
     public List<ClassroomVM> getByCourseId(Long courseId) {
         List<Classroom> classrooms = classroomRepository.findByCourseId(courseId);