solution

cinema/serializes.py

@@ -0,0 +1,24 @@
+from rest_framework import serializers
+
+from cinema.models import Movie
+
+
+class MovieSerializer(serializers.Serializer):
+    id = serializers.IntegerField(read_only=True)
+    title = serializers.CharField(required=True)
+    description = serializers.CharField(required=True)
+    duration = serializers.IntegerField(required=True)
+    def create(self, validated_data):
+        return Movie.objects.create(**validated_data)
+    def update(self, instance, validated_data):
+        instance.title = validated_data.get("title", instance.title)
+        instance.description = validated_data.get(
+            "description",
+            instance.description
+        )
+        instance.duration = validated_data.get(
+            "duration",
+            instance.duration
+        )
+        instance.save()
+        return instance

cinema/urls.py

@@ -0,0 +1,8 @@
+from django.urls import path
+from cinema.views import movie_list, movie_detail
+
+urlpatterns = [
+    path("movies/", movie_list, name="movie-list"),
+    path("movies/<int:pk>/", movie_detail, name="movie-detail"),
+]
+app_name = "cinema"