fix lession

apps/course/urls.py

@@ -13,6 +13,8 @@ urlpatterns = [
     path('<slug:slug>/attachments/', views.AttachmentListAPIView.as_view(), name='course-attachment-list'),
     path('<slug:slug>/glossaries/', views.GlossaryListAPIView.as_view(), name='course-glossary-list'),
     path('<slug:slug>/lessons/', views.LessonListView.as_view(), name='course-lesson-list'),
+    path('lesson/<int:id>/', views.LessonDetailView.as_view(), name='lesson-detail'),
+
     path('<slug:slug>/participants/', views.CourseParticipantsView.as_view(), name='course-participant-list'),
     
     # path('<slug:slug>/participant/join/', views.ParticipantCreateView.as_view(), name='course-participant-join'),

apps/course/views/lesson.py

@@ -4,6 +4,7 @@ from drf_yasg.utils import swagger_auto_schema
 from drf_yasg import openapi
 from django.shortcuts import get_object_or_404
 from rest_framework import status
+from rest_framework.response import Response
 
 from apps.course.serializers import (
     LessonSerializer
@@ -32,3 +33,40 @@ class LessonListView(ListAPIView):
             raise AppAPIException({"message": "course not found"}, status_code=status.HTTP_404_NOT_FOUND)
         
         return self.queryset.filter(course=course).order_by('priority','id')
+
+
+
+
+class LessonDetailView(RetrieveAPIView):
+    serializer_class = LessonSerializer
+
+    def get(self, request, *args, **kwargs):
+        lesson_id = self.kwargs.get('id')
+        lesson = get_object_or_404(Lesson, id=lesson_id, is_active=True)
+        
+        # Get the next and previous lessons based on priority and id
+        next_lesson = Lesson.objects.filter(
+            course=lesson.course,
+            is_active=True,
+            priority__gte=lesson.priority,
+            id__gt=lesson.id
+        ).order_by('priority', 'id').first()
+
+        previous_lesson = Lesson.objects.filter(
+            course=lesson.course,
+            is_active=True,
+            priority__lte=lesson.priority,
+            id__lt=lesson.id
+        ).order_by('-priority', '-id').first()
+
+        # Serialize the current lesson
+        lesson_data = self.get_serializer(lesson).data
+
+        # Add next and previous lesson ids
+        lesson_data['next_lesson_id'] = next_lesson.id if next_lesson else None
+        lesson_data['previous_lesson_id'] = previous_lesson.id if previous_lesson else None
+
+        lesson_data['can_go_next'] = next_lesson is not None
+
+        return Response(lesson_data)
+