solution

cinema/models.py

@@ -27,6 +27,10 @@ class Actor(models.Model):
     first_name = models.CharField(max_length=255)
     last_name = models.CharField(max_length=255)
 
+    @property
+    def full_name(self):
+        return f"{self.first_name} {self.last_name}"
+
     def __str__(self):
         return self.first_name + " " + self.last_name
 
@@ -85,16 +89,14 @@ def clean(self):
             (self.row, "row", "count_rows"),
             (self.seat, "seat", "count_seats_in_row"),
         ]:
-            count_attrs = getattr(
-                self.movie_session.cinema_hall, cinema_hall_attr_name
-            )
+            count_attrs = getattr(self.movie_session.cinema_hall, cinema_hall_attr_name)
             if not (1 <= ticket_attr_value <= count_attrs):
                 raise ValidationError(
                     {
                         ticket_attr_name: f"{ticket_attr_name} number "
-                        f"must be in available range: "
-                        f"(1, {cinema_hall_attr_name}): "
-                        f"(1, {count_attrs})"
+                                          f"must be in available range: "
+                                          f"(1, {cinema_hall_attr_name}): "
+                                          f"(1, {count_attrs})"
                     }
                 )
 

cinema/serializers.py

@@ -1 +1,80 @@
-# write serializers here
+from rest_framework import serializers
+from cinema.models import CinemaHall, Genre, Actor, Movie, MovieSession
+
+
+class CinemaHallSerializer(serializers.ModelSerializer):
+    class Meta:
+        model = CinemaHall
+        fields = ("id", "name", "rows", "seats_in_row", "capacity")
+
+
+class GenreSerializer(serializers.ModelSerializer):
+    class Meta:
+        model = Genre
+        fields = ("id", "name")
+
+
+class ActorSerializer(serializers.ModelSerializer):
+    class Meta:
+        model = Actor
+        fields = ("id", "first_name", "last_name", "full_name")
+
+
+class MovieSerializer(serializers.ModelSerializer):
+    class Meta:
+        model = Movie
+        fields = ("id", "title", "description", "duration", "genres", "actors")
+
+
+class MovieListSerializer(MovieSerializer):
+    genres = serializers.SlugRelatedField(
+        many=True,
+        read_only=True,
+        slug_field="name"
+    )
+    actors = serializers.SlugRelatedField(
+        many=True,
+        read_only=True,
+        slug_field="full_name"
+    )
+
+
+class MovieDetailSerializer(MovieSerializer):
+    genres = GenreSerializer(many=True, read_only=True)
+    actors = ActorSerializer(many=True, read_only=True)
+
+
+class MovieSessionSerializer(serializers.ModelSerializer):
+    movie = serializers.PrimaryKeyRelatedField(queryset=Movie.objects.all())
+    cinema_hall = serializers.PrimaryKeyRelatedField(queryset=CinemaHall.objects.all())
+    class Meta:
+        model = MovieSession
+        fields = ("show_time", "movie", "cinema_hall")
+
+
+class MovieSessionListSerializer(MovieSessionSerializer):
+    movie_title = serializers.CharField(
+        source="movie.title",
+        read_only=True
+    )
+    cinema_hall_name = serializers.CharField(
+        source="cinema_hall.name",
+        read_only=True
+    )
+    cinema_hall_capacity = serializers.IntegerField(
+        source="cinema_hall.capacity",
+        read_only=True
+    )
+
+    class Meta:
+        model = MovieSession
+        fields = (
+            "id", "show_time",
+            "movie_title", "cinema_hall_name",
+            "cinema_hall_capacity"
+        )
+
+
+class MovieSessionDetailSerializer(MovieSessionSerializer):
+    movie = MovieListSerializer(many=False, read_only=True)
+    cinema_hall = CinemaHallSerializer(many=False, read_only=True)

cinema/urls.py

@@ -1 +1,23 @@
-# write urls here
+from django.urls import path, include
+from rest_framework import routers
+
+from cinema.views import (
+    CinemaHallViewSet,
+    GenreViewSet,
+    ActorViewSet,
+    MovieViewSet,
+    MovieSessionViewSet
+)
+
+router = routers.DefaultRouter()
+router.register("cinema_halls", CinemaHallViewSet)
+router.register("genres", GenreViewSet)
+router.register("actors", ActorViewSet)
+router.register("movies", MovieViewSet, basename="movie")
+router.register("movie_sessions", MovieSessionViewSet, basename="movie_session")
+
+urlpatterns = [
+    path("", include(router.urls))
+]
+
+app_name = "cinema"

cinema/views.py

@@ -1 +1,60 @@
-# write views here
+from rest_framework import viewsets
+from cinema.models import CinemaHall, Genre, Actor, Movie, MovieSession
+from cinema.serializers import (
+    CinemaHallSerializer, GenreSerializer,
+    ActorSerializer, MovieSerializer,
+    MovieSessionSerializer, MovieListSerializer,
+    MovieDetailSerializer, MovieSessionListSerializer,
+    MovieSessionDetailSerializer
+)
+
+
+class CinemaHallViewSet(viewsets.ModelViewSet):
+    queryset = CinemaHall.objects.all()
+    serializer_class = CinemaHallSerializer
+
+
+class GenreViewSet(viewsets.ModelViewSet):
+    queryset = Genre.objects.all()
+    serializer_class = GenreSerializer
+
+
+class ActorViewSet(viewsets.ModelViewSet):
+    queryset = Actor.objects.all()
+    serializer_class = ActorSerializer
+
+
+class MovieViewSet(viewsets.ModelViewSet):
+    queryset = Movie.objects.all()
+    serializer_class = MovieSerializer
+
+    def get_queryset(self):
+        queryset = self.queryset
+        if self.action in ("list", "retrieve"):
+            return queryset.prefetch_related("genres", "actors")
+        return queryset
+
+    def get_serializer_class(self):
+        if self.action == "list":
+            return MovieListSerializer
+        if self.action == "retrieve":
+            return MovieDetailSerializer
+        return MovieSerializer
+
+
+class MovieSessionViewSet(viewsets.ModelViewSet):
+    queryset = MovieSession.objects.all()
+    serializer_class = MovieSessionSerializer
+
+    def get_queryset(self):
+        queryset = self.queryset
+        if self.action == "list":
+            return queryset.select_related("movie", "cinema_hall")
+        return queryset
+
+    def get_serializer_class(self):
+        if self.action == "list":
+            return MovieSessionListSerializer
+        if self.action == "retrieve":
+            return MovieSessionDetailSerializer
+        return MovieSessionSerializer

cinema_service/settings.py

@@ -119,7 +119,7 @@
 
 USE_I18N = True
 
-USE_TZ = True
+USE_TZ = False
 
 
 # Static files (CSS, JavaScript, Images)

cinema_service/urls.py

@@ -1,6 +1,7 @@
 from django.contrib import admin
-from django.urls import path
+from django.urls import path, include
 
 urlpatterns = [
     path("admin/", admin.site.urls),
+    path("api/cinema/", include("cinema.urls", namespace="cinema")),
 ]