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 2024-11-10 15:20
+
+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, 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, 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=('row', 'seat', 'movie_session'), name='unique_ticket_per_session'),
+        ),
+    ]

db/models.py

@@ -1,4 +1,14 @@
+from django.contrib.auth.models import AbstractUser
+from django.core.exceptions import ValidationError
 from django.db import models
+from django.db.models import DateTimeField, ForeignKey, IntegerField, \
+    UniqueConstraint
+
+import settings
+
+
+class User(AbstractUser):
+    ...
 
 
 class Genre(models.Model):
@@ -17,7 +27,7 @@ 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 +60,49 @@ class MovieSession(models.Model):
 
     def __str__(self) -> str:
         return f"{self.movie.title} {str(self.show_time)}"
+
+
+class Order(models.Model):
+    created_at = DateTimeField(auto_now_add=True)
+    user = ForeignKey(settings.AUTH_USER_MODEL, on_delete=models.CASCADE)
+
+    def __str__(self) -> str:
+        return f"{self.created_at}"
+
+    class Meta:
+        ordering = ["-created_at"]
+
+
+class Ticket(models.Model):
+    movie_session = ForeignKey(MovieSession, on_delete=models.CASCADE)
+    order = ForeignKey(Order, on_delete=models.CASCADE)
+    row = IntegerField()
+    seat = IntegerField()
+
+    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:
+        if not (1 <= self.row <= self.movie_session.cinema_hall.rows):
+            raise ValidationError(
+                {"row": ["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": ["seat number must be in available range: "
+                          "(1, seats_in_row): (1, "
+                          f"{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_ticket_per_session")
+        ]

services/movie.py

@@ -1,14 +1,18 @@
 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
 ) -> QuerySet:
     queryset = Movie.objects.all()
 
+    if title is not None:
+        queryset = queryset.filter(title__icontains=title)
+
     if genres_ids:
         queryset = queryset.filter(genres__id__in=genres_ids)
 
@@ -28,13 +32,14 @@ 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(
@@ -41,4 +41,16 @@ def update_movie_session(
 
 
 def delete_movie_session_by_id(session_id: int) -> None:
-    MovieSession.objects.get(id=session_id).delete()
+    try:
+        MovieSession.objects.get(id=session_id).delete()
+    except MovieSession.DoesNotExist:
+        raise ValueError(f"MovieSession with id {session_id} does not exist")
+
+
+def get_taken_seats(movie_session_id: int) -> list[dict]:
+    tickets = Ticket.objects.filter(movie_session_id=movie_session_id)
+
+    taken_seats = [{"row": ticket.row, "seat": ticket.seat} for ticket in
+                   tickets]
+
+    return taken_seats

services/order.py

@@ -0,0 +1,51 @@
+from django.contrib.auth import get_user_model
+from django.db.models import QuerySet
+from django.shortcuts import get_object_or_404
+from django.db import transaction
+from db.models import Ticket, Order, User, MovieSession
+from django.core.exceptions import ValidationError
+
+
+def create_order(tickets: list, username: str, date: str = None) -> Order:
+    with transaction.atomic():
+        user = get_object_or_404(get_user_model(), username=username)
+
+        order = Order.objects.create(user=user)
+
+        if date:
+            try:
+                order.created_at = date
+                order.save()
+            except ValidationError:
+                raise ValueError(
+                    f"Invalid date format for order creation: {date}"
+                )
+
+        for ticket_data in tickets:
+            if not MovieSession.objects.filter(
+                    id=ticket_data["movie_session"]
+            ).exists():
+                raise ValueError(
+                    f"MS with id {ticket_data['movie_session']} does not exist"
+                )
+
+        ticket_objects = [
+            Ticket(
+                order=order,
+                movie_session_id=ticket_data["movie_session"],
+                row=ticket_data["row"],
+                seat=ticket_data["seat"]
+            )
+            for ticket_data in tickets
+        ]
+
+        Ticket.objects.bulk_create(ticket_objects)
+
+        return order
+
+
+def get_orders(username: str = None) -> QuerySet[Order]:
+    if username:
+        user = get_object_or_404(User, username=username)
+        return Order.objects.filter(user=user)
+    return Order.objects.all()

services/user.py

@@ -0,0 +1,52 @@
+from django.shortcuts import get_object_or_404
+
+from db.models import User
+
+
+def create_user(username: str,
+                password: str,
+                email: str = None,
+                first_name: str = None,
+                last_name: str = None) -> User:
+
+    user_data = {
+        "username": username,
+        "password": password
+    }
+    if email:
+        user_data["email"] = email
+    if first_name:
+        user_data["first_name"] = first_name
+    if last_name:
+        user_data["last_name"] = last_name
+
+    some_user = User.objects.create_user(**user_data)
+    return some_user
+
+
+def get_user(user_id: int) -> User:
+    return get_object_or_404(User, id=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:
+    updated_user = User.objects.get(id=user_id)
+
+    if username:
+        updated_user.username = username
+    if email:
+        updated_user.email = email
+    if first_name:
+        updated_user.first_name = first_name
+    if last_name:
+        updated_user.last_name = last_name
+    if password:
+        updated_user.set_password(password)
+
+    updated_user.save()
+
+    return updated_user

settings.py

@@ -15,6 +15,8 @@
     }
 }
 
+AUTH_USER_MODEL = "db.User"
+
 LANGUAGE_CODE = "en-us"
 
 TIME_ZONE = "Europe/Kiev"
@@ -25,4 +27,6 @@
 
 INSTALLED_APPS = [
     "db",
+    "django.contrib.auth",
+    "django.contrib.contenttypes",
 ]

tests/test_main.py

@@ -168,7 +168,8 @@ def test_movie_service_get_movies_with_title(movies_data):
         ("Harry Kasparov: Documentary",),
     ]
 
-    assert list(get_movies(title="harry potter").values_list("title")) == [
+    assert list(get_movies(
+        title="harry potter").values_list("title")) == [
         ("Harry Potter 1",),
         ("Harry Potter 2",),
         ("Harry Potter 3",),