Solution

db/migrations/0002_user_order_alter_movie_actors_alter_movie_genres_and_more.py

@@ -0,0 +1,95 @@
+# Generated by Django 4.0.2 on 2024-09-01 21:37
+
+from django.conf import settings
+import django.contrib.auth.models
+import django.contrib.auth.validators
+from django.db import migrations, models
+import django.db.models.deletion
+import django.utils.timezone
+
+
+class Migration(migrations.Migration):
+
+ dependencies = [
+ ('auth', '0012_alter_user_first_name_max_length'),
+ ('db', '0001_initial'),
+ ]
+
+ operations = [
+ migrations.CreateModel(
+ name='User',
+ fields=[
+ ('id', models.AutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+ ('password', models.CharField(max_length=128, verbose_name='password')),
+ ('last_login', models.DateTimeField(blank=True, null=True, verbose_name='last login')),
+ ('is_superuser', models.BooleanField(default=False, help_text='Designates that this user has all permissions without explicitly assigning them.', verbose_name='superuser status')),
+ ('username', models.CharField(error_messages={'unique': 'A user with that username already exists.'}, help_text='Required. 150 characters or fewer. Letters, digits and @/./+/-/_ only.', max_length=150, unique=True, validators=[django.contrib.auth.validators.UnicodeUsernameValidator()], verbose_name='username')),
+ ('first_name', models.CharField(blank=True, max_length=150, verbose_name='first name')),
+ ('last_name', models.CharField(blank=True, max_length=150, verbose_name='last name')),
+ ('email', models.EmailField(blank=True, max_length=254, verbose_name='email address')),
+ ('is_staff', models.BooleanField(default=False, help_text='Designates whether the user can log into this admin site.', verbose_name='staff status')),
+ ('is_active', models.BooleanField(default=True, help_text='Designates whether this user should be treated as active. Unselect this instead of deleting accounts.', verbose_name='active')),
+ ('date_joined', models.DateTimeField(default=django.utils.timezone.now, verbose_name='date joined')),
+ ('groups', models.ManyToManyField(blank=True, help_text='The groups this user belongs to. A user will get all permissions granted to each of their groups.', related_name='user_set', related_query_name='user', to='auth.Group', verbose_name='groups')),
+ ('user_permissions', models.ManyToManyField(blank=True, help_text='Specific permissions for this user.', related_name='user_set', related_query_name='user', to='auth.Permission', verbose_name='user permissions')),
+ ],
+ options={
+ 'verbose_name': 'user',
+ 'verbose_name_plural': 'users',
+ 'abstract': False,
+ },
+ managers=[
+ ('objects', django.contrib.auth.models.UserManager()),
+ ],
+ ),
+ migrations.CreateModel(
+ name='Order',
+ fields=[
+ ('id', models.AutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+ ('created_at', models.DateTimeField(auto_now_add=True)),
+ ('user', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, related_name='orders', to=settings.AUTH_USER_MODEL)),
+ ],
+ options={
+ 'ordering': ('-created_at',),
+ },
+ ),
+ migrations.AlterField(
+ model_name='movie',
+ name='actors',
+ field=models.ManyToManyField(related_name='movies', to='db.Actor'),
+ ),
+ migrations.AlterField(
+ model_name='movie',
+ name='genres',
+ field=models.ManyToManyField(related_name='movies', to='db.Genre'),
+ ),
+ migrations.AlterField(
+ model_name='movie',
+ name='title',
+ field=models.CharField(db_index=True, max_length=255),
+ ),
+ migrations.AlterField(
+ model_name='moviesession',
+ name='cinema_hall',
+ field=models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, related_name='movie_sessions', to='db.cinemahall'),
+ ),
+ migrations.AlterField(
+ model_name='moviesession',
+ name='movie',
+ field=models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, related_name='movie_sessions', to='db.movie'),
+ ),
+ migrations.CreateModel(
+ name='Ticket',
+ fields=[
+ ('id', models.AutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+ ('row', models.IntegerField()),
+ ('seat', models.IntegerField()),
+ ('movie_session', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, related_name='tickets', to='db.moviesession')),
+ ('order', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, related_name='tickets', to='db.order')),
+ ],
+ ),
+ migrations.AddConstraint(
+ model_name='ticket',
+ constraint=models.UniqueConstraint(fields=('movie_session', 'row', 'seat'), name='unique_ticket_constraint'),
+ ),
+ ]

db/models.py

@@ -1,4 +1,11 @@
+from django.conf import settings
 from django.db import models
+from django.core.exceptions import ValidationError
+from django.contrib.auth.models import AbstractUser
+
+
+class User(AbstractUser):
+ pass
 
 
 class Genre(models.Model):
@@ -17,7 +24,7 @@ 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 +57,73 @@ 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):
+ movie_session = models.ForeignKey(
+ to=MovieSession,
+ on_delete=models.CASCADE,
+ related_name="tickets")
+ order = models.ForeignKey(
+ to=Order,
+ on_delete=models.CASCADE,
+ related_name="tickets")
+ row = models.IntegerField()
+ seat = models.IntegerField()
+
+ class Meta:
+ constraints = [
+ models.UniqueConstraint(
+ fields=["movie_session", "row", "seat"],
+ name="unique_ticket_constraint_movie_session_row_seat"
+ )
+ ]
+ ordering = ["movie_session", "row", "seat"]
+
+ def __str__(self) -> str:
+ return (
+ f"{self.movie_session.movie.title} {self.movie_session.show_time} "
+ f"(row: {self.row}, seat: {self.seat})"
+ )
+
+ def clean(self) -> None:
+ if not (0 < 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 (0 < 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()
+ super().save(*args, **kwargs)

services/cinema_hall.py

@@ -8,7 +8,9 @@ def get_cinema_halls() -> QuerySet:
 
 
 def create_cinema_hall(
- hall_name: str, hall_rows: int, hall_seats_in_row: int
+ hall_name: str,
+ hall_rows: int,
+ hall_seats_in_row: int
 ) -> CinemaHall:
  return CinemaHall.objects.create(
  name=hall_name, rows=hall_rows, seats_in_row=hall_seats_in_row

services/movie.py

@@ -1,11 +1,13 @@
 from django.db.models import QuerySet
+from django.db import transaction
 
 from db.models import Movie
 
 
 def get_movies(
  genres_ids: list[int] = None,
  actors_ids: list[int] = None,
+ title: str | None = None
 ) -> QuerySet:
  queryset = Movie.objects.all()
 
@@ -15,13 +17,13 @@ def get_movies(
  if actors_ids:
  queryset = queryset.filter(actors__id__in=actors_ids)
 
- return queryset
-
+ if title:
+ queryset = queryset.filter(title__icontains=title)
 
-def get_movie_by_id(movie_id: int) -> Movie:
- return Movie.objects.get(id=movie_id)
+ return queryset
 
 
+@transaction.atomic
 def create_movie(
  movie_title: str,
  movie_description: str,
@@ -38,3 +40,7 @@ def create_movie(
  movie.actors.set(actors_ids)
 
  return movie
+
+
+def get_movie_by_id(movie_id: int) -> Movie:
+ return Movie.objects.get(id=movie_id)

services/movie_session.py

@@ -1,10 +1,12 @@
 from django.db.models import QuerySet
 
-from db.models import MovieSession
+from db.models import MovieSession, Ticket
 
 
 def create_movie_session(
- movie_show_time: str, movie_id: int, cinema_hall_id: int
+ movie_show_time: str,
+ movie_id: int,
+ cinema_hall_id: int
 ) -> MovieSession:
  return MovieSession.objects.create(
  show_time=movie_show_time,
@@ -42,3 +44,11 @@ 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]:
+ return list(
+ Ticket.objects.filter
+ (movie_session_id=movie_session_id)
+ .values("row", "seat")
+ )

services/order.py

@@ -0,0 +1,35 @@
+from django.db import transaction
+from django.db.models import QuerySet
+
+from db.models import Order, Ticket, User
+
+
+def create_order(
+ tickets: list[dict],
+ username: str,
+ date: str = None
+) -> Order:
+ user = User.objects.get(username=username)
+
+ with transaction.atomic():
+ order = Order.objects.create(user=user)
+ if date:
+ order.created_at = date
+ order.save()
+
+ for ticket_data in tickets:
+ Ticket.objects.create(
+ movie_session_id=ticket_data["movie_session"],
+ order=order,
+ row=ticket_data["row"],
+ seat=ticket_data["seat"]
+ )
+
+ return order
+
+
+def get_orders(username: str | None = None) -> QuerySet:
+ return (
+ Order.objects.filter(user__username=username)
+ if username else Order.objects.all()
+ )

services/user.py

@@ -0,0 +1,59 @@
+from django.contrib.auth import get_user_model
+
+
+User = get_user_model()
+
+
+def create_user(
+ username: str,
+ password: str,
+ email: str | None = None,
+ first_name: str | None = None,
+ last_name: str | None = None
+) -> User:
+ user = User.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()
+
+ return user
+
+
+def get_user(user_id: int) -> User:
+ return User.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
+) -> User:
+ user = get_user(user_id)
+
+ if any([username, password, email, first_name, last_name]):
+ 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

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