first_try

.gitignore

@@ -7,4 +7,5 @@ venv/
 .pytest_cache/
 **__pycache__/
 *.pyc
-app/db.sqlite3
+app/db.sqlite3
+**db.sqlite3

cinema/models.py

@@ -31,7 +31,7 @@ def __str__(self):
         return self.first_name + " " + self.last_name
 
     @property
-    def full_name(self):
+    def full_name(self) -> str:
         return f"{self.first_name} {self.last_name}"
 
 
@@ -84,24 +84,40 @@ class Ticket(models.Model):
     row = models.IntegerField()
     seat = models.IntegerField()
 
-    def clean(self):
-        for ticket_attr_value, ticket_attr_name, cinema_hall_attr_name in [
-            (self.row, "row", "rows"),
-            (self.seat, "seat", "seats_in_row"),
+    @staticmethod
+    def validate_seats(
+            seat: int,
+            row: int,
+            movie_session: MovieSession,
+            error_to_raise
+    ) -> None:
+        for ticket_atr_value, ticket_attr_name, cinema_hall_attr_name in [
+            (seat, "seat", "seats_in_row"),
+            (row, "row", "rows")
         ]:
             count_attrs = getattr(
-                self.movie_session.cinema_hall, cinema_hall_attr_name
+                movie_session.cinema_hall,
+                cinema_hall_attr_name
             )
-            if not (1 <= ticket_attr_value <= count_attrs):
-                raise ValidationError(
+            if not (1 <= ticket_atr_value <= count_attrs):
+                raise error_to_raise(
                     {
-                        ticket_attr_name: f"{ticket_attr_name} "
-                        f"number must be in available range: "
-                        f"(1, {cinema_hall_attr_name}): "
-                        f"(1, {count_attrs})"
+                        ticket_attr_name:
+                        f"{ticket_attr_name} number must be "
+                        f"in available range: "
+                        f"(1, {cinema_hall_attr_name}): (1, {count_attrs})"
                     }
+
                 )
 
+    def clean(self):
+        Ticket.validate_seats(
+            self.seat,
+            self.row,
+            self.movie_session,
+            ValidationError
+        )
+
     def save(
         self,
         force_insert=False,
@@ -110,7 +126,7 @@ def save(
         update_fields=None,
     ):
         self.full_clean()
-        super(Ticket, self).save(
+        return super(Ticket, self).save(
             force_insert, force_update, using, update_fields
         )
 

cinema/pagination.py

@@ -0,0 +1,7 @@
+from rest_framework.pagination import PageNumberPagination
+
+
+class OrderSetPagination(PageNumberPagination):
+    page_size = 3
+    page_size_query_param = "page_size"
+    max_page_size = 5

cinema/serializers.py

@@ -1,6 +1,15 @@
+from django.db import transaction
 from rest_framework import serializers
 
-from cinema.models import Genre, Actor, CinemaHall, Movie, MovieSession
+from cinema.models import (
+    Genre,
+    Actor,
+    CinemaHall,
+    Movie,
+    MovieSession,
+    Ticket,
+    Order
+)
 
 
 class GenreSerializer(serializers.ModelSerializer):
@@ -59,6 +68,7 @@ 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 +78,71 @@ class Meta:
             "movie_title",
             "cinema_hall_name",
             "cinema_hall_capacity",
+            "tickets_available",
         )
 
 
+class TicketSerializer(serializers.ModelSerializer):
+    class Meta:
+        model = Ticket
+        fields = ("id", "row", "seat", "movie_session")
+
+    def validate(self, attr: dict) -> dict:
+        Ticket.validate_seats(
+            attr["seat"],
+            attr["row"],
+            attr["movie_session"],
+            error_to_raise=serializers.ValidationError(
+                "This seat is already taken"
+            ),
+        )
+        return attr
+
+
+class TicketSeatsSerializer(TicketSerializer):
+    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)
+    movie = MovieListSerializer(read_only=True)
+    cinema_hall = CinemaHallSerializer(read_only=True)
+    taken_places = TicketSeatsSerializer(
+        source="tickets",
+        many=True,
+        read_only=True
+    )
+
+    def get_taken_places(self, movie_session: MovieSession) -> list:
+        return [
+            {"row": ticket.row, "seat": ticket.seat}
+            for ticket in movie_session.tickets.all()
+        ]
 
     class Meta:
         model = MovieSession
-        fields = ("id", "show_time", "movie", "cinema_hall")
+        fields = ("id", "show_time", "movie", "cinema_hall", "taken_places")
+
+
+class TicketListSerializer(TicketSerializer):
+    movie_session = MovieSessionListSerializer(read_only=True, many=False)
+
+
+class OrderSerializer(serializers.ModelSerializer):
+    tickets = TicketSerializer(many=True, allow_empty=False)
+
+    class Meta:
+        model = Order
+        fields = ("id", "created_at", "tickets")
+
+    def create(self, validated_data):
+        with transaction.atomic():
+            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)
+
+
+class OrderListSerializer(OrderSerializer):
+    tickets = TicketListSerializer(many=True, read_only=True)

cinema/urls.py

@@ -7,6 +7,7 @@
     CinemaHallViewSet,
     MovieViewSet,
     MovieSessionViewSet,
+    OrderViewSet,
 )
 
 router = routers.DefaultRouter()
@@ -15,6 +16,7 @@
 router.register("cinema_halls", CinemaHallViewSet)
 router.register("movies", MovieViewSet)
 router.register("movie_sessions", MovieSessionViewSet)
+router.register("orders", OrderViewSet)
 
 urlpatterns = [path("", include(router.urls))]
 

cinema/utils.py

@@ -0,0 +1,2 @@
+def filter_request_to_int(query_params: str) -> list:
+    return [int(str_id) for str_id in query_params.split(",")]

cinema/views.py

@@ -1,6 +1,9 @@
+from django.db.models import F, Count
 from rest_framework import viewsets
 
-from cinema.models import Genre, Actor, CinemaHall, Movie, MovieSession
+from cinema.models import Genre, Actor, CinemaHall, Movie, MovieSession, Order
+from cinema.pagination import OrderSetPagination
+from cinema.utils import filter_request_to_int
 
 from cinema.serializers import (
     GenreSerializer,
@@ -12,6 +15,8 @@
     MovieDetailSerializer,
     MovieSessionDetailSerializer,
     MovieListSerializer,
+    OrderSerializer,
+    OrderListSerializer,
 )
 
 
@@ -43,6 +48,28 @@ def get_serializer_class(self):
 
         return MovieSerializer
 
+    def get_queryset(self):
+        queryset = super().get_queryset()
+
+        if self.action == "list":
+            queryset = self.queryset.prefetch_related("actors", "genres")
+
+            genres = self.request.query_params.get("genres")
+            actors = self.request.query_params.get("actors")
+            title = self.request.query_params.get("title")
+            if genres:
+                genres = filter_request_to_int(genres)
+                queryset = queryset.filter(genres__id__in=genres)
+
+            if actors:
+                actors = filter_request_to_int(actors)
+                queryset = queryset.filter(actors__id__in=actors)
+
+            if title:
+                queryset = queryset.filter(title__icontains=title)
+
+        return queryset.distinct()
+
 
 class MovieSessionViewSet(viewsets.ModelViewSet):
     queryset = MovieSession.objects.all()
@@ -56,3 +83,53 @@ def get_serializer_class(self):
             return MovieSessionDetailSerializer
 
         return MovieSessionSerializer
+
+    def get_queryset(self):
+        queryset = super().get_queryset()
+        if self.action == "list":
+            queryset = queryset.select_related()
+            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)
+
+            queryset = queryset.annotate(
+                tickets_available=F("cinema_hall__rows")
+                * F("cinema_hall__seats_in_row")
+                - Count("tickets")
+            )
+        if self.action == "retrieve":
+            queryset = queryset.select_related("movie", "cinema_hall")
+
+        return queryset
+
+
+class OrderViewSet(viewsets.ModelViewSet):
+    queryset = Order.objects.all()
+    serializer_class = OrderSerializer
+    pagination_class = OrderSetPagination
+
+    def get_queryset(self):
+        queryset = self.queryset.filter(user=self.request.user)
+
+        if self.action in ("list", "retrieve"):
+            queryset = queryset.prefetch_related(
+                "tickets__movie_session__movie",
+                "tickets__movie_session__cinema_hall"
+            )
+
+        return queryset
+
+    def get_serializer_class(self):
+        serializer = self.serializer_class
+        if self.action in ("list", "retrieve"):
+            return OrderListSerializer
+
+        return serializer
+
+    def perform_create(self, serializer):
+        serializer.save(user=self.request.user)

cinema_service/settings.py

@@ -124,7 +124,7 @@
 
 USE_I18N = True
 
-USE_TZ = False
+USE_TZ = True
 
 
 # Static files (CSS, JavaScript, Images)