Solution

db/models.py

@@ -1,4 +1,10 @@
+
+from django.contrib.auth.models import AbstractUser
+from django.core.exceptions import ValidationError
 from django.db import models
+from django.db.models import UniqueConstraint
+
+import settings
 
 
 class Genre(models.Model):
@@ -17,7 +23,7 @@ def __str__(self) -> str:
 
 
 class Movie(models.Model):
- title = models.CharField(max_length=255)
+ title = models.CharField(max_length=255, db_index=True)
  description = models.TextField()
  actors = models.ManyToManyField(to=Actor, related_name="movies")
  genres = models.ManyToManyField(to=Genre, related_name="movies")
@@ -50,3 +56,74 @@ class MovieSession(models.Model):
 
  def __str__(self) -> str:
  return f"{self.movie.title} {str(self.show_time)}"
+
+
+class Order(models.Model):
+ created_at = models.DateTimeField(auto_now_add=True)
+ user = models.ForeignKey(
+ settings.AUTH_USER_MODEL,
+ on_delete=models.CASCADE
+ )
+
+ class Meta:
+ ordering = ["-created_at"]
+
+ def __str__(self) -> str:
+ return f"{self.created_at}"
+
+
+class Ticket(models.Model):
+ movie_session = models.ForeignKey(
+ MovieSession,
+ on_delete=models.CASCADE,
+ related_name="tickets"
+ )
+ order = models.ForeignKey(Order, on_delete=models.CASCADE)
+ row = models.IntegerField()
+ seat = models.IntegerField()
+
+ def clean(self) -> None:
+ if not (1 <= self.row <= self.movie_session.cinema_hall.rows):
+ raise ValidationError(
+ {
+ "row": (
+ f"row number must be in available range: "
+ f"(1, rows): "
+ f"(1, {self.movie_session.cinema_hall.rows})"
+ )
+ }
+ )
+
+ if not (1 <= self.seat <= self.movie_session.cinema_hall.seats_in_row):
+ raise ValidationError(
+ {
+ "seat": (
+ f"seat number must be in available range: "
+ f"(1, seats_in_row): "
+ f"(1, {self.movie_session.cinema_hall.seats_in_row})"
+ )
+ }
+ )
+
+ def save(self, *args, **kwargs) -> None:
+ self.full_clean()
+ return super().save(*args, **kwargs)
+
+ class Meta:
+ constraints = [
+ UniqueConstraint(
+ fields=["row", "seat", "movie_session"],
+ name="unique_row_seat_movie_session_session"
+ ),
+ ]
+
+ def __str__(self) -> str:
+ return (
+ f"{self.movie_session.movie.title} "
+ f"{self.movie_session.show_time} "
+ f"(row: {self.row}, seat: {self.seat})"
+ )
+
+
+class User(AbstractUser):
+ pass

services/movie.py

@@ -1,3 +1,4 @@
+from django.db import transaction
 from django.db.models import QuerySet
 
 from db.models import Movie
@@ -6,6 +7,7 @@
 def get_movies(
  genres_ids: list[int] = None,
  actors_ids: list[int] = None,
+ title: str = None,
 ) -> QuerySet:
  queryset = Movie.objects.all()
 
@@ -15,6 +17,9 @@ def get_movies(
  if actors_ids:
  queryset = queryset.filter(actors__id__in=actors_ids)
 
+ if title:
+ queryset = queryset.filter(title__icontains=title)
+
  return queryset
 
 
@@ -28,13 +33,14 @@ def create_movie(
  genres_ids: list = None,
  actors_ids: list = None,
 ) -> Movie:
- movie = Movie.objects.create(
- title=movie_title,
- description=movie_description,
- )
- if genres_ids:
- movie.genres.set(genres_ids)
- if actors_ids:
- movie.actors.set(actors_ids)
-
- return movie
+ with transaction.atomic():
+ movie = Movie.objects.create(
+ title=movie_title,
+ description=movie_description,
+ )
+ if genres_ids:
+ movie.genres.set(genres_ids)
+ if actors_ids:
+ movie.actors.set(actors_ids)
+
+ return movie

services/movie_session.py

@@ -1,6 +1,6 @@
 from django.db.models import QuerySet
 
-from db.models import MovieSession
+from db.models import MovieSession, Ticket
 
 
 def create_movie_session(
@@ -24,6 +24,14 @@ def get_movie_session_by_id(movie_session_id: int) -> MovieSession:
  return MovieSession.objects.get(id=movie_session_id)
 
 
+def get_taken_seats(movie_session_id: int) -> list[dict]:
+ return list(
+ Ticket.objects
+ .filter(movie_session__id=movie_session_id)
+ .values("row", "seat")
+ )
+
+
 def update_movie_session(
  session_id: int,
  show_time: str = None,

services/order.py

@@ -0,0 +1,36 @@
+from django.contrib.auth import get_user_model
+from django.db import transaction
+from django.db.models import QuerySet
+
+from db.models import Ticket, Order
+
+
+def create_order(tickets: list[dict], username: str, date: str = None) -> None:
+ with transaction.atomic():
+ user = get_user_model().objects.get(username=username)
+ order = Order.objects.create(user=user)
+
+ if date:
+ order.created_at = date
+ order.save()
+
+ ticket_objects = [
+ Ticket(
+ order=order,
+ row=ticket["row"],
+ seat=ticket["seat"],
+ movie_session_id=ticket["movie_session"]
+ )
+ for ticket in tickets
+ ]
+
+ Ticket.objects.bulk_create(ticket_objects)
+
+
+def get_orders(username: str = None) -> QuerySet:
+ queryset = Order.objects.all()
+
+ if username:
+ queryset = queryset.filter(user__username=username)
+
+ return queryset

services/user.py

@@ -0,0 +1,53 @@
+from django.contrib.auth import get_user_model
+
+from db.models import User
+
+
+def create_user(
+ username: str,
+ password: str,
+ email: str = None,
+ first_name: str = None,
+ last_name: str = None
+) -> None:
+ user = get_user_model().objects.create_user(
+ username=username,
+ password=password,
+ )
+
+ if email:
+ user.email = email
+ if first_name:
+ user.first_name = first_name
+ if last_name:
+ user.last_name = last_name
+
+ user.save()
+
+
+def get_user(user_id: int) -> User:
+ return get_user_model().objects.get(pk=user_id)
+
+
+def update_user(
+ user_id: int,
+ username: str = None,
+ password: str = None,
+ email: str = None,
+ first_name: str = None,
+ last_name: str = None
+) -> None:
+ user = get_user(user_id)
+
+ if username:
+ user.username = username
+ if email:
+ user.email = email
+ if first_name:
+ user.first_name = first_name
+ if last_name:
+ user.last_name = last_name
+ if password:
+ user.set_password(password)
+
+ user.save()

settings.py

@@ -24,5 +24,9 @@
 USE_TZ = False
 
 INSTALLED_APPS = [
+ "django.contrib.auth",
+ "django.contrib.contenttypes",
  "db",
 ]
+
+AUTH_USER_MODEL = "db.User"