Solution

db/migrations/0002_user_alter_movie_actors_alter_movie_genres_and_more.py

@@ -0,0 +1,76 @@
+# Generated by Django 4.0.2 on 2023-12-11 01:10
+
+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')),
+ ],
+ options={
+ 'verbose_name': 'user',
+ 'verbose_name_plural': 'users',
+ 'abstract': False,
+ },
+ managers=[
+ ('objects', django.contrib.auth.models.UserManager()),
+ ],
+ ),
+ 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='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.AddIndex(
+ model_name='movie',
+ index=models.Index(fields=['title'], name='db_movie_title_5d0841_idx'),
+ ),
+ migrations.AddField(
+ model_name='user',
+ name='groups',
+ field=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'),
+ ),
+ migrations.AddField(
+ model_name='user',
+ name='user_permissions',
+ field=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'),
+ ),
+ ]

db/migrations/0003_order.py

@@ -0,0 +1,26 @@
+# Generated by Django 4.0.2 on 2023-12-11 01:15
+
+from django.conf import settings
+from django.db import migrations, models
+import django.db.models.deletion
+
+
+class Migration(migrations.Migration):
+
+ dependencies = [
+ ('db', '0002_user_alter_movie_actors_alter_movie_genres_and_more'),
+ ]
+
+ operations = [
+ 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, to=settings.AUTH_USER_MODEL)),
+ ],
+ options={
+ 'ordering': ['-created_at'],
+ },
+ ),
+ ]

db/migrations/0004_ticket_ticket_unique_movie_session_row_seat.py

@@ -0,0 +1,28 @@
+# Generated by Django 4.0.2 on 2023-12-11 01:17
+
+from django.db import migrations, models
+import django.db.models.deletion
+
+
+class Migration(migrations.Migration):
+
+ dependencies = [
+ ('db', '0003_order'),
+ ]
+
+ operations = [
+ 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, to='db.moviesession')),
+ ('order', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, to='db.order')),
+ ],
+ ),
+ migrations.AddConstraint(
+ model_name='ticket',
+ constraint=models.UniqueConstraint(fields=('movie_session', 'row', 'seat'), name='unique_movie_session_row_seat'),
+ ),
+ ]

db/migrations/0005_alter_order_user_alter_ticket_order.py

@@ -0,0 +1,25 @@
+# Generated by Django 4.0.2 on 2023-12-12 12:44
+
+from django.conf import settings
+from django.db import migrations, models
+import django.db.models.deletion
+
+
+class Migration(migrations.Migration):
+
+ dependencies = [
+ ('db', '0004_ticket_ticket_unique_movie_session_row_seat'),
+ ]
+
+ operations = [
+ migrations.AlterField(
+ model_name='order',
+ name='user',
+ field=models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, related_name='orders', to=settings.AUTH_USER_MODEL),
+ ),
+ migrations.AlterField(
+ model_name='ticket',
+ name='order',
+ field=models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, related_name='tickets', to='db.order'),
+ ),
+ ]

db/models.py

@@ -1,5 +1,14 @@
+from django.contrib.auth.models import AbstractUser
+from django.core.exceptions import ValidationError
 from django.db import models
 
+from typing import Any
+import settings
+
+
+class User(AbstractUser):
+ pass
+
 
 class Genre(models.Model):
  name = models.CharField(max_length=255, unique=True)
@@ -22,6 +31,11 @@ class Movie(models.Model):
  actors = models.ManyToManyField(to=Actor, related_name="movies")
  genres = models.ManyToManyField(to=Genre, related_name="movies")
 
+ class Meta:
+ indexes = [
+ models.Index(fields=["title"])
+ ]
+
  def __str__(self) -> str:
  return self.title
 
@@ -50,3 +64,64 @@ 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 str(self.created_at)
+
+
+class Ticket(models.Model):
+ movie_session = models.ForeignKey("MovieSession", on_delete=models.CASCADE)
+ order = models.ForeignKey(
+ "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_movie_session_row_seat"
+ )
+ ]
+
+ def __str__(self) -> str:
+ return (f"{self.movie_session.movie.title} "
+ f"{self.movie_session.show_time} "
+ f"(row: {self.row}, seat: {self.seat})")
+
+ def clean(self) -> None:
+ errors = {}
+
+ if not (1 <= self.row <= self.movie_session.cinema_hall.rows):
+ errors["row"] = (f"row number must be "
+ f"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):
+ errors["seat"] = (
+ f"seat number must be "
+ f"in available range: (1, seats_in_row): (1, "
+ f"{self.movie_session.cinema_hall.seats_in_row})"
+ )
+
+ if errors:
+ raise ValidationError(errors)
+
+ def save(self, *args, **kwargs) -> Any:
+ self.full_clean()
+ return super(Ticket, self).save(*args, **kwargs)

services/movie.py

@@ -1,3 +1,4 @@
+from django.db import transaction
 from django.db.models import QuerySet
 
 from db.models import Movie
@@ -6,9 +7,13 @@
 def get_movies(
  genres_ids: list[int] = None,
  actors_ids: list[int] = None,
+ title: str = None
 ) -> QuerySet:
  queryset = Movie.objects.all()
 
+ if title:
+ queryset = queryset.filter(title__icontains=title)
+
  if genres_ids:
  queryset = queryset.filter(genres__id__in=genres_ids)
 
@@ -22,6 +27,7 @@ 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 +42,11 @@ 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 +1,49 @@
+from datetime import datetime
+
+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
+from services.movie_session import get_movie_session_by_id, get_taken_seats
+
+
+@transaction.atomic
+def create_order(
+ tickets: list[dict],
+ username: str,
+ date: datetime = None
+) -> None:
+ order = Order.objects.create(
+ user=get_user_model().objects.get(username=username)
+ )
+
+ if date:
+ order.created_at = date
+ order.save()
+
+ for ticket in tickets:
+ movie_session = ticket.get("movie_session")
+ row = ticket.get("row")
+ seat = ticket.get("seat")
+
+ row_seat_data = {
+ "movie_session": get_movie_session_by_id(movie_session),
+ "order": order,
+ "row": row,
+ "seat": seat,
+ }
+
+ if (row, seat) not in get_taken_seats(movie_session):
+ Ticket.objects.create(**row_seat_data)
+
+
+def get_orders(
+ username: str = None
+) -> QuerySet[Order]:
+ queryset = Order.objects.all()
+
+ if username:
+ queryset = Order.objects.filter(user__username=username)
+
+ return queryset