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 2024-11-11 00:52
+
+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=('row', 'seat', 'movie_session'), name='ticket_constraint'),
+        ),
+    ]

db/models.py

@@ -1,4 +1,8 @@
+from django.contrib.auth.models import AbstractUser
+from django.core.exceptions import ValidationError
+from django.conf import settings
 from django.db import models
+from django.db.models import UniqueConstraint
 
 
 class Genre(models.Model):
@@ -17,7 +21,7 @@ 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 +54,74 @@ 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,
+        related_name="orders"
+    )
+
+    class Meta:
+        ordering = ["-created_at"]
+
+    def __str__(self) -> str:
+        return str(self.created_at)
+
+
+class Ticket(models.Model):
+    row = models.IntegerField()
+    seat = models.IntegerField()
+
+    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"
+    )
+
+    class Meta:
+        constraints = [
+            UniqueConstraint(
+                fields=["row", "seat", "movie_session"],
+                name="ticket_constraint",
+            )
+        ]
+
+    def clean(self) -> None:
+        cinema_hall = self.movie_session.cinema_hall
+        if self.row > cinema_hall.rows:
+            raise ValidationError(
+                {
+                    "row": [
+                        "row number must be in available range: "
+                        f"(1, rows): (1, {cinema_hall.rows})"
+                    ]
+                }
+            )
+        if self.seat > cinema_hall.seats_in_row:
+            raise ValidationError(
+                {
+                    "seat": [
+                        "seat number must be in available range: "
+                        f"(1, seats_in_row): (1, {cinema_hall.seats_in_row})"
+                    ]
+                }
+            )
+
+    def save(self, *args, **kwargs) -> None:
+        self.full_clean()
+        super().save(*args, **kwargs)
+
+    def __str__(self) -> str:
+        return f"{self.movie_session} (row: {self.row}, seat: {self.seat})"
+
+
+class User(AbstractUser):
+    pass

services/movie.py

@@ -1,14 +1,20 @@
+from django.db import transaction
 from django.db.models import QuerySet
+from django.shortcuts import get_object_or_404
 
 from db.models import Movie
 
 
 def get_movies(
+    title: str = None,
     genres_ids: list[int] = None,
     actors_ids: list[int] = 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)
 
@@ -19,9 +25,10 @@ def get_movies(
 
 
 def get_movie_by_id(movie_id: int) -> Movie:
-    return Movie.objects.get(id=movie_id)
+    return get_object_or_404(Movie, id=movie_id)
 
 
+@transaction.atomic
 def create_movie(
     movie_title: str,
     movie_description: str,

services/movie_session.py

@@ -1,6 +1,7 @@
 from django.db.models import QuerySet
+from django.shortcuts import get_object_or_404
 
-from db.models import MovieSession
+from db.models import MovieSession, Ticket
 
 
 def create_movie_session(
@@ -21,7 +22,7 @@ def get_movies_sessions(session_date: str = None) -> QuerySet:
 
 
 def get_movie_session_by_id(movie_session_id: int) -> MovieSession:
-    return MovieSession.objects.get(id=movie_session_id)
+    return get_object_or_404(MovieSession, id=movie_session_id)
 
 
 def update_movie_session(
@@ -41,4 +42,12 @@ def update_movie_session(
 
 
 def delete_movie_session_by_id(session_id: int) -> None:
-    MovieSession.objects.get(id=session_id).delete()
+    get_object_or_404(MovieSession, 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 +1,48 @@
+import datetime
+
+from django.contrib.auth import get_user_model
+from django.db import transaction
+from django.db.models import QuerySet
+from django.shortcuts import get_object_or_404
+
+from db.models import Order, Ticket, MovieSession
+
+
+@transaction.atomic
+def create_order(
+        tickets: list[dict],
+        username: str,
+        date: datetime = None
+) -> Order:
+    user = get_object_or_404(get_user_model(), username=username)
+
+    order = Order.objects.create(
+        user=user
+    )
+
+    if date:
+        order.created_at = date
+        order.save()
+
+    for ticket in tickets:
+        movie_session = get_object_or_404(
+            MovieSession,
+            id=ticket.get("movie_session")
+        )
+
+        Ticket.objects.create(
+            row=ticket.get("row"),
+            seat=ticket.get("seat"),
+            movie_session_id=movie_session.id,
+            order=order
+        )
+
+    return order
+
+
+def get_orders(username: str = None) -> QuerySet[Order]:
+    if username:
+        return Order.objects.filter(
+            user=get_object_or_404(get_user_model(), username=username)
+        )
+    return Order.objects.all()

services/user.py

@@ -0,0 +1,69 @@
+from django.contrib.auth import get_user_model
+from django.core.exceptions import ValidationError
+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:
+    if get_user_model().objects.filter(username=username).exists():
+        raise ValidationError("Username already exists.")
+
+    if get_user_model().objects.filter(email=email).exists():
+        raise ValidationError("Email already exists.")
+
+    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()
+    return user
+
+
+def get_user(user_id: int) -> User:
+    return get_object_or_404(get_user_model(), 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 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"