Solution

.dockerignore

@@ -0,0 +1,4 @@
+/.venv/
+/.idea/
+/Dockerfile
+/docker-compose.yaml

.flake8

@@ -1,6 +1,6 @@
 [flake8]
 inline-quotes = "
-ignore = E203, E266, W503, N807, N818, F401
+ignore = E203, E266, W503, N807, N818, F401, VNE003
 max-line-length = 79
 max-complexity = 18
 select = B,C,E,F,W,T4,B9,Q0,N8,VNE

Dockerfile

@@ -0,0 +1,23 @@
+FROM python:3.12.1-alpine3.18
+LABEL maintainer="knyrikkolesnichenko2004@gmail.com"
+
+WORKDIR app/
+
+ENV PYTHONBUFFERED 1
+
+COPY requirements.txt requirements.txt
+RUN pip install -r requirements.txt
+
+COPY . .
+
+RUN mkdir -p /files/media/
+
+RUN adduser \
+    --disabled-password \
+    --no-create-home \
+    django_user
+
+RUN chown -R django_user /files/media
+RUN chmod -R 755 /files/media
+
+USER django_user

cinema/management/commands/wait_for_db.py

@@ -0,0 +1,27 @@
+import time
+
+from django.core.management.base import BaseCommand
+from django.db.utils import OperationalError
+from psycopg import OperationalError as PsycopgOperationalError
+
+
+class Command(BaseCommand):
+    help = "Force the app to wait while the database is unavailable"
+
+    def handle(self, *args, **options) -> None:
+        self.stdout.write("Waiting for the database...")
+        db_up = False
+
+        while not db_up:
+            try:
+                self.check(databases=("default",))
+                db_up = True
+            except (PsycopgOperationalError, OperationalError):
+                self.stdout.write(
+                    "Database is unavailable, wait for a second..."
+                )
+                time.sleep(1)
+
+        self.stdout.write(
+            self.style.SUCCESS("The database is available!")
+        )

cinema/migrations/0002_alter_movie_actors_alter_movie_genres_and_more.py

@@ -0,0 +1,41 @@
+# Generated by Django 6.0.4 on 2026-04-25 06:03
+
+import django.db.models.deletion
+from django.conf import settings
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('cinema', '0001_initial'),
+        migrations.swappable_dependency(settings.AUTH_USER_MODEL),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='movie',
+            name='actors',
+            field=models.ManyToManyField(blank=True, related_name='movies', to='cinema.actor'),
+        ),
+        migrations.AlterField(
+            model_name='movie',
+            name='genres',
+            field=models.ManyToManyField(blank=True, related_name='movies', to='cinema.genre'),
+        ),
+        migrations.AlterField(
+            model_name='moviesession',
+            name='cinema_hall',
+            field=models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, related_name='movie_sessions', to='cinema.cinemahall'),
+        ),
+        migrations.AlterField(
+            model_name='moviesession',
+            name='movie',
+            field=models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, related_name='movie_sessions', to='cinema.movie'),
+        ),
+        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),
+        ),
+    ]

cinema_service/settings.py

@@ -9,6 +9,7 @@
 For the full list of settings and their values, see
 https://docs.djangoproject.com/en/4.0/ref/settings/
 """
+import os
 from datetime import timedelta
 from pathlib import Path
 
@@ -86,9 +87,13 @@
 
 DATABASES = {
     "default": {
-        "ENGINE": "django.db.backends.sqlite3",
-        "NAME": BASE_DIR / "db.sqlite3",
-    }
+        "ENGINE": "django.db.backends.postgresql",
+        "NAME": os.environ.get("POSTGRES_DB"),
+        "USER": os.environ.get("POSTGRES_USER"),
+        "PASSWORD": os.environ.get("POSTGRES_PASSWORD"),
+        "HOST": os.environ.get("POSTGRES_HOST"),
+        "PORT": os.environ.get("POSTGRES_PORT"),
+    },
 }
 
 
@@ -134,7 +139,7 @@
 STATIC_URL = "static/"
 
 MEDIA_URL = "/media/"
-MEDIA_ROOT = BASE_DIR / "media"
+MEDIA_ROOT = "/files/media"
 
 # Default primary key field type
 # https://docs.djangoproject.com/en/4.0/ref/settings/#default-auto-field

docker-compose.yaml

@@ -0,0 +1,31 @@
+services:
+  cinema:
+    build:
+      context: .
+    env_file:
+      - .env
+    ports:
+      - "8000:8000"
+    volumes:
+      - my_media:/files/media
+    command: >
+      sh -c "python manage.py wait_for_db &&
+             python manage.py makemigrations &&
+             python manage.py migrate &&
+             python manage.py runserver 0.0.0.0:8000"
+    depends_on:
+      - db
+
+  db:
+    image: postgres:16.0-alpine3.17
+    restart: always
+    ports:
+      - "5432:5432"
+    env_file:
+      - .env
+    volumes:
+      - my_db:$PGDATA
+
+volumes:
+  my_db:
+  my_media:

requirements.txt

@@ -8,3 +8,5 @@ djangorestframework
 djangorestframework-simplejwt
 drf-spectacular
 Pillow
+psycopg
+psycopg_binary