solution

db/models.py

@@ -1,4 +1,10 @@
+from django.contrib.auth.models import User, AbstractUser
+from django.contrib.sitemaps.views import index
+from django.core.exceptions import ValidationError
 from django.db import models
+from django.forms import IntegerField
+
+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 +56,71 @@ 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, related_name="orders")
+
+
+ class Meta:
+ ordering = ["-created_at"]
+
+
+ def __str__(self) -> str:
+ return f"{self.created_at}"
+
+class Ticket(models.Model):
+ row = models.IntegerField()
+ seat = models.IntegerField()
+ movie_session = models.ForeignKey(
+ MovieSession,
+ on_delete=models.CASCADE,
+ related_name="tickets"
+ )
+ order = models.ForeignKey(
+ Order,
+ on_delete=models.CASCADE,
+ related_name="tickets"
+ )
+
+ 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 Meta:
+ constraints = [
+ models.UniqueConstraint(
+ fields=["movie_session", "row", "seat"],
+ name="unique_movie_session_row_seat"
+ )
+ ]
+
+ def clean(self):
+ if not (1 <= self.row <= self.movie_session.cinema_hall.rows):
+ raise ValidationError(
+ {
+ "row":
+ f"row number must be in available range: (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):
+ self.full_clean()
+ super().save(*args, **kwargs)
+
+
+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
@@ -6,14 +7,16 @@
 def get_movies(
  genres_ids: list[int] = None,
  actors_ids: list[int] = None,
+ title: str = None
 ) -> QuerySet:
  queryset = Movie.objects.all()
 
  if genres_ids:
  queryset = queryset.filter(genres__id__in=genres_ids)
-
  if actors_ids:
  queryset = queryset.filter(actors__id__in=actors_ids)
+ if title:
+ queryset = queryset.filter(title__icontains=title)
 
  return queryset
 
@@ -22,6 +25,7 @@ def get_movie_by_id(movie_id: int) -> Movie:
  return Movie.objects.get(id=movie_id)
 
 
+@transaction.atomic
 def create_movie(
  movie_title: str,
  movie_description: str,

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(
@@ -42,3 +42,8 @@ def update_movie_session(
 
 def delete_movie_session_by_id(session_id: int) -> None:
  MovieSession.objects.get(id=session_id).delete()
+
+
+def get_taken_seats(movie_session_id: int) -> list[dict]:
+ tickets = Ticket.objects.filter(movie_session_id=movie_session_id)
+ return [{"row": ticket.row, "seat": ticket.seat} for ticket in tickets]

services/order.py

@@ -0,0 +1,36 @@
+from datetime import datetime
+
+from django.db import transaction
+from django.db.models import QuerySet
+
+from db.models import Order, Ticket, MovieSession, User
+from django.utils import timezone
+
+
+@transaction.atomic
+def create_order(tickets: list[dict], username: str, date: str = None) -> Order:
+ user = User.objects.get(username=username)
+ if date:
+ created_at = timezone.make_aware(datetime.strptime(date, "%Y-%m-%d %H:%M"))
+
+ else:
+ created_at = timezone.now()
+
+ order = Order.objects.create(user=user, created_at=created_at)
+
+ for ticket_data in tickets:
+ movie_session = MovieSession.objects.get(id=ticket_data["movie_session"])
+ Ticket.objects.create(
+ order=order,
+ movie_session=movie_session,
+ row=ticket_data["row"],
+ seat=ticket_data["seat"]
+ )
+
+ return order
+
+
+def get_orders(username: str = None) -> QuerySet:
+ if username:
+ return Order.objects.filter(user__username=username)
+ return Order.objects.all()

services/user.py

@@ -0,0 +1,55 @@
+from django.contrib.auth import get_user_model
+from django.core.exceptions import ObjectDoesNotExist
+
+
+User = get_user_model()
+
+
+def create_user(
+ username: str,
+ password: str,
+ email: str = None,
+ first_name: str = None,
+ last_name: str = None
+) -> User:
+ user = User.objects.create_user(
+ username=username,
+ password=password,
+ email=email
+ )
+ if first_name:
+ user.first_name = first_name
+ if last_name:
+ user.last_name = last_name
+ user.save()
+ return user
+
+
+def get_user(user_id: int) -> User:
+ try:
+ return User.objects.get(id=user_id)
+ except User.DoesNotExist:
+ raise ObjectDoesNotExist(f"User with id {user_id} does not exist.")
+
+
+def update_user(
+ user_id: int,
+ username: str = None,
+ password: str = None,
+ email: str = None,
+ first_name: str = None,
+ last_name: str = None
+) -> User:
+ user = get_user(user_id)
+ if username:
+ user.username = username
+ if password:
+ user.set_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()
+ return user

settings.py

@@ -19,10 +19,15 @@
 
 TIME_ZONE = "Europe/Kiev"
 
+
 USE_I18N = True
 
 USE_TZ = False
 
 INSTALLED_APPS = [
  "db",
+ "django.contrib.auth",
+ "django.contrib.contenttypes",
 ]
+
+AUTH_USER_MODEL = "db.User"