"solution"

cinema/migrations/0002_initial.py

@@ -19,14 +19,16 @@ class Migration(migrations.Migration):
             model_name="order",
             name="user",
             field=models.ForeignKey(
-                on_delete=django.db.models.deletion.CASCADE, to=settings.AUTH_USER_MODEL
+                on_delete=django.db.models.deletion.CASCADE,
+                to=settings.AUTH_USER_MODEL,
             ),
         ),
         migrations.AddField(
             model_name="moviesession",
             name="cinema_hall",
             field=models.ForeignKey(
-                on_delete=django.db.models.deletion.CASCADE, to="cinema.cinemahall"
+                on_delete=django.db.models.deletion.CASCADE,
+                to="cinema.cinemahall",
             ),
         ),
         migrations.AddField(

cinema/migrations/0003_movie_duration.py

@@ -6,13 +6,13 @@
 class Migration(migrations.Migration):
 
     dependencies = [
-        ('cinema', '0002_initial'),
+        ("cinema", "0002_initial"),
     ]
 
     operations = [
         migrations.AddField(
-            model_name='movie',
-            name='duration',
+            model_name="movie",
+            name="duration",
             field=models.IntegerField(default=123),
             preserve_default=False,
         ),

cinema/migrations/0004_alter_genre_name.py

@@ -6,13 +6,13 @@
 class Migration(migrations.Migration):
 
     dependencies = [
-        ('cinema', '0003_movie_duration'),
+        ("cinema", "0003_movie_duration"),
     ]
 
     operations = [
         migrations.AlterField(
-            model_name='genre',
-            name='name',
+            model_name="genre",
+            name="name",
             field=models.CharField(max_length=255, unique=True),
         ),
     ]

cinema/serializers.py

@@ -1,6 +1,14 @@
 from rest_framework import serializers
 
-from cinema.models import Genre, Actor, CinemaHall, Movie, MovieSession
+from cinema.models import (
+    Genre,
+    Actor,
+    CinemaHall,
+    Movie,
+    MovieSession,
+    Order,
+    Ticket,
+)
 
 
 class GenreSerializer(serializers.ModelSerializer):
@@ -59,6 +67,7 @@ class MovieSessionListSerializer(MovieSessionSerializer):
     cinema_hall_capacity = serializers.IntegerField(
         source="cinema_hall.capacity", read_only=True
     )
+    tickets_available = serializers.IntegerField(read_only=True)
 
     class Meta:
         model = MovieSession
@@ -68,13 +77,58 @@ class Meta:
             "movie_title",
             "cinema_hall_name",
             "cinema_hall_capacity",
+            "tickets_available",
         )
 
 
+class TicketSeatRowSerializer(serializers.ModelSerializer):
+    class Meta:
+        model = Ticket
+        fields = ("row", "seat")
+
+
 class MovieSessionDetailSerializer(MovieSessionSerializer):
     movie = MovieListSerializer(many=False, read_only=True)
     cinema_hall = CinemaHallSerializer(many=False, read_only=True)
+    taken_places = TicketSeatRowSerializer(
+        many=True,
+        read_only=True,
+        source="tickets",
+    )
 
     class Meta:
         model = MovieSession
-        fields = ("id", "show_time", "movie", "cinema_hall")
+        fields = ("id", "show_time", "movie", "cinema_hall", "taken_places")
+
+
+class TicketSerializer(serializers.ModelSerializer):
+    movie_session = MovieSessionListSerializer(many=False, read_only=True)
+
+    class Meta:
+        model = Ticket
+        fields = ("id", "movie_session", "row", "seat")
+
+    def validate(self, data):
+        data = super(TicketSerializer).validate(data)
+        ticket = Ticket(
+            movie_session=data.get("movie_session"),
+            row=data.get("row"),
+            seat=data.get("seat"),
+        )
+        ticket.full_clean()
+        return data
+
+
+class OrderSerializer(serializers.ModelSerializer):
+    tickets = TicketSerializer(many=True, read_only=True, allow_null=False)
+
+    class Meta:
+        model = Order
+        fields = ("id", "created_at", "tickets")
+
+    def create(self, validated_data):
+        tickets_data = validated_data.pop("tickets")
+        order = Order.objects.create(**validated_data)
+        for ticket_data in tickets_data:
+            Ticket.objects.create(order=order, **ticket_data)
+        return order

cinema/tests/test_movie_session_api.py

@@ -34,12 +34,7 @@ def setUp(self):
         self.movie_session = MovieSession.objects.create(
             movie=self.movie,
             cinema_hall=self.cinema_hall,
-            show_time=datetime.datetime(
-                year=2022,
-                month=9,
-                day=2,
-                hour=9
-            ),
+            show_time=datetime.datetime(year=2022, month=9, day=2, hour=9),
         )
 
     def test_get_movie_sessions(self):

cinema/urls.py

@@ -7,6 +7,8 @@
     CinemaHallViewSet,
     MovieViewSet,
     MovieSessionViewSet,
+    OrderViewSet,
+    TicketViewSet,
 )
 
 router = routers.DefaultRouter()
@@ -15,6 +17,8 @@
 router.register("cinema_halls", CinemaHallViewSet)
 router.register("movies", MovieViewSet)
 router.register("movie_sessions", MovieSessionViewSet)
+router.register("orders", OrderViewSet)
+router.register("tickets", TicketViewSet)
 
 urlpatterns = [path("", include(router.urls))]
 

cinema/views.py

@@ -1,6 +1,16 @@
+from django.db.models import Count, F
 from rest_framework import viewsets
-
-from cinema.models import Genre, Actor, CinemaHall, Movie, MovieSession
+from rest_framework.pagination import PageNumberPagination
+
+from cinema.models import (
+    Genre,
+    Actor,
+    CinemaHall,
+    Movie,
+    MovieSession,
+    Order,
+    Ticket,
+)
 
 from cinema.serializers import (
     GenreSerializer,
@@ -12,6 +22,8 @@
     MovieDetailSerializer,
     MovieSessionDetailSerializer,
     MovieListSerializer,
+    OrderSerializer,
+    TicketSerializer,
 )
 
 
@@ -43,6 +55,28 @@ def get_serializer_class(self):
 
         return MovieSerializer
 
+    def get_queryset(self):
+        queryset = super().get_queryset()
+        if self.action == ("list", "retrieve"):
+            queryset = self.queryset.prefetch_related("actors", "genres")
+
+        actors = self.request.query_params.get("actors")
+        genres = self.request.query_params.get("genres")
+        title = self.request.query_params.get("title")
+
+        if actors:
+            actors_ids = [int(str_id) for str_id in actors.split(",")]
+            queryset = queryset.filter(actors__id__in=actors_ids)
+
+        if genres:
+            genres_ids = [int(str_id) for str_id in genres.split(",")]
+            queryset = queryset.filter(genres__id__in=genres_ids)
+
+        if title:
+            queryset = queryset.filter(title__icontains=title)
+
+        return queryset.distinct()
+
 
 class MovieSessionViewSet(viewsets.ModelViewSet):
     queryset = MovieSession.objects.all()
@@ -56,3 +90,45 @@ def get_serializer_class(self):
             return MovieSessionDetailSerializer
 
         return MovieSessionSerializer
+
+    def get_queryset(self):
+        queryset = super().get_queryset()
+
+        if self.action == "retrieve":
+            queryset = queryset.select_related("movie")
+
+        elif self.action == "list":
+            queryset = (
+                queryset.select_related("cinema_hall").annotate(
+                    tickets_available=(
+                        F("cinema_hall__rows") * F("cinema_hall__seats_in_row")
+                        - Count("tickets")
+                    )
+                )
+            ).order_by("id")
+
+        movie = self.request.query_params.get("movie")
+        date = self.request.query_params.get("date")
+
+        if movie:
+            queryset = queryset.filter(movie__id=movie)
+
+        if date:
+            queryset = queryset.filter(show_time__date=date)
+
+        return queryset.distinct()
+
+
+class TicketViewSet(viewsets.ModelViewSet):
+    queryset = Ticket.objects.all()
+    serializer_class = TicketSerializer
+
+
+class OrderPagination(PageNumberPagination):
+    page_size = 5
+
+
+class OrderViewSet(viewsets.ModelViewSet):
+    queryset = Order.objects.all()
+    serializer_class = OrderSerializer
+    pagination_class = OrderPagination

cinema_service/settings.py

@@ -20,9 +20,7 @@
 # See https://docs.djangoproject.com/en/4.0/howto/deployment/checklist/
 
 # SECURITY WARNING: keep the secret key used in production secret!
-SECRET_KEY = (
-    "django-insecure-6vubhk2$++agnctay_4pxy_8cq)mosmn(*-#2b^v4cgsh-^!i3"
-)
+SECRET_KEY = "django-insecure-6vubhk2$++agnctay_4pxy_8cq)mosmn(*-#2b^v4cgsh-^!i3"
 
 # SECURITY WARNING: don't run with debug turned on in production!
 DEBUG = True
@@ -100,16 +98,13 @@
         "UserAttributeSimilarityValidator",
     },
     {
-        "NAME": "django.contrib.auth.password_validation."
-        "MinimumLengthValidator",
+        "NAME": "django.contrib.auth.password_validation." "MinimumLengthValidator",
     },
     {
-        "NAME": "django.contrib.auth.password_validation."
-        "CommonPasswordValidator",
+        "NAME": "django.contrib.auth.password_validation." "CommonPasswordValidator",
     },
     {
-        "NAME": "django.contrib.auth.password_validation."
-        "NumericPasswordValidator",
+        "NAME": "django.contrib.auth.password_validation." "NumericPasswordValidator",
     },
 ]