add retrieve endpoint for playlyst by id

apps/core/serializers.py

 from rest_framework import serializers
 
-from .models import Video, Category, Tag, TagToObject
+from .models import Video, Playlist, Category, TagToObject
 
 
 class TagToObjectSerializer(serializers.ModelSerializer):
@@ -34,3 +34,22 @@ class VideoSerializer(serializers.ModelSerializer):
             'categories',
             'tags',
         ]
+
+
+class PlaylistSerializer(serializers.ModelSerializer):
+    videos = VideoSerializer(many=True)
+    tags = TagToObjectSerializer(many=True)
+
+    class Meta:
+        model = Playlist
+        fields = [
+            'id',
+            'title',
+            'description',
+            'sort',
+            'type',
+            'mrss',
+            'json',
+            'videos',
+            'tags',
+        ]

apps/core/signals.py

@@ -6,7 +6,8 @@ from . import models
 
 
 @receiver(post_save, sender=models.Playlist)
-def save_playlist_mrss(sender, instance, created, **kwargs):
+def save_playlist_links(sender, instance, created, **kwargs):
     if created:
+        instance.json = f'{settings.DOMAIN_NAME}/api/playlist/{instance.id}/'
         instance.mrss = f'{settings.DOMAIN_NAME}/api/playlist/{instance.id}/mrss'
         instance.save()

apps/core/urls.py

@@ -5,5 +5,6 @@ from . import views
 
 urlpatterns = [
     path('video/', views.VideoAPIView.as_view({'get': 'list'})),
+    path('playlist/<int:pk>/', views.VideoRetrieveAPIView.as_view()),
     path('playlist/<int:pk>/mrss', views.playlist_mrss_view),
 ]

apps/core/views.py

-from rest_framework import permissions, viewsets
+from rest_framework import permissions, viewsets, generics
 
 from django.http import HttpResponse
 from django.shortcuts import get_object_or_404
@@ -22,6 +22,13 @@ class VideoAPIView(viewsets.ModelViewSet):
         return queryset
 
 
+class VideoRetrieveAPIView(generics.RetrieveAPIView):
+    queryset = models.Playlist.objects.all()
+    serializer_class = serializers.PlaylistSerializer
+    permission_classes = [permissions.AllowAny]
+    lookup_field = 'pk'
+
+
 def playlist_mrss_view(request, pk):
     mrss_items = []
     playlist = get_object_or_404(models.Playlist, pk=pk)