Solution by Rar571 · Pull Request #1008 · mate-academy/py-dockerize-cinema

Rar571 · 2026-04-17T11:16:03Z

No description provided.

mateacademy-ai-mentor

Review Summary

I am requesting changes because the current Docker setup has several critical issues that will likely prevent building, running, and accessing the service as required.

Critical issues to fix first:

In .dockerignore, you currently ignore Dockerfile (the line with Dockerfile near the top); this removes the Dockerfile from the build context and can break docker build / docker-compose up --build. Remove that entry and also consider adding common ignores like .env, __pycache__/, *.pyc, and .pytest_cache/.
In docker-compose.yaml, the main app service is named cinema and does not expose port 8000; the task expects to run commands like docker-compose run app ... and to access the API on 127.0.0.1:8000. Either rename the service to app or adjust your commands, and add a ports section such as:
```
services:
  app:
    ports:
      - "8000:8000"
```
Also in docker-compose.yaml, the DB volume is mapped as db_data:$PG_DATA, which references an undefined environment variable and does not point to PostgreSQL’s data directory; change this to db_data:/var/lib/postgresql/data so data persists correctly.
In Dockerfile, the adduser invocation uses Debian-style flags (--disabled-password, --no-create-home) which do not work on Alpine and can cause the image build to fail; switch to an Alpine-compatible form like adduser -D my_user (and ensure /app is owned by that user if you keep USER my_user). Additionally, if your requirements.txt includes packages like psycopg2, you should install Alpine build dependencies before pip install, for example by adding an apk add --no-cache gcc musl-dev postgresql-dev libffi-dev openssl-dev build-base step.

Configuration issues to address next:

In cinema_service/settings.py, MEDIA_ROOT is set to the relative path "files/media", while your compose file mounts an absolute path /files/media; update MEDIA_ROOT to /files/media (or adjust the volume) so media files are written into the mounted volume. Also ensure your .env (used by docker-compose) sets SQL_ENGINE=django.db.backends.postgresql and SQL_HOST=db so Django uses PostgreSQL in Docker instead of defaulting to SQLite/localhost.
In cinema/management/commands/wait_for_db.py, the command defines a help1 attribute instead of the standard help; rename this to help so manage.py help shows a proper description and the command matches Django’s expected API.

You’ve already done a good job wiring up Postgres, a wait_for_db command, and basic Docker assets; once you apply these fixes, your setup will be much closer to a fully working, self-contained Dockerized DRF service.

✨ Please rate this review in the Platform's notification center¹. I will be grateful for your feedback! ✨

Important

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mateacademy-ai-mentor · 2026-04-17T11:18:39Z

+FROM python:3.11.6-alpine3.18
+
+LABEL maintainer="rarturus"
+


The .dockerignore is very minimal. Add common ignores such as .env, __pycache__/, *.pyc, .pytest_cache/ and optionally media if you don't want to copy uploaded files into the image. Also you currently ignore Dockerfile (line 2) which is unnecessary; while not always fatal it is unusual and may hide files needed in the build context. Finally, you list docker-compose.yaml but the task expects docker-compose.yml — consider including both names to be safe.

mateacademy-ai-mentor · 2026-04-17T11:18:39Z

+WORKDIR /app
+
+COPY requirements.txt .
+RUN pip install --no-cache-dir -r requirements.txt


Installing Python packages on Alpine often requires system build dependencies (gcc, musl-dev, postgresql-dev, libffi-dev, openssl-dev, build-base, etc.) if your requirements include packages like psycopg2. If you rely on such packages, add the necessary apk add --no-cache ... before pip install, or use prebuilt wheels (for example psycopg2-binary) to avoid build failures on Alpine.

mateacademy-ai-mentor · 2026-04-17T11:18:39Z

+RUN adduser \
+        --disabled-password \
+        --no-create-home \
+        my_user


The adduser options used here (--disabled-password, --no-create-home) are GNU-style and may not be supported by Alpine's adduser. On Alpine you typically use adduser -D -H my_user or create user/group with addgroup/adduser flags appropriate for the base image. Please adapt this to the Alpine toolset so the user is created reliably.

mateacademy-ai-mentor · 2026-04-17T11:18:39Z

+RUN chown -R my_user /files/media
+RUN chmod -R 755 /files/media
+
+USER my_user


Setting USER my_user makes the container run as non-root, which is good for security but will often cause permission problems when mounting the host project into /app (the mounted files may be owned by root or a different UID). Either ensure /app is owned by my_user (chown) at runtime, create the user with the same UID as the host developer, or run as root in development to avoid permission errors with migrations, collectstatic, or file writes.

mateacademy-ai-mentor · 2026-04-17T11:18:39Z

+ENV PYTHONUNBUFFERED 1
+
+WORKDIR /app
+


The management command has a typo: use the attribute name help, not help1. While the command will still run, the help text won't be available in manage.py help and this deviates from the typical implementation required by the task. Consider also adding a small timeout/retry limit or logging if you need it.

mateacademy-ai-mentor · 2026-04-17T11:18:39Z

@@ -0,0 +1,19 @@
+import time
+from django.core.management.base import BaseCommand


Critical: You are ignoring the Dockerfile in .dockerignore. Docker will not send the Dockerfile into the build context if it's listed here, which prevents building the app image. Remove this line so the Dockerfile is included in the build context.

mateacademy-ai-mentor · 2026-04-17T11:18:39Z

+                break
+            except OperationalError:
+                self.stdout.write("Database unavailable, waiting 1 second...")
+                time.sleep(1)


The adduser command used here appears to use Debian-style flags (e.g. --disabled-password, --no-create-home). On Alpine-based images the adduser implementation and flags are different and this RUN may fail during image build. Either use an Alpine-compatible user creation (e.g. adduser -D my_user) or use a different base image. Also consider creating a home directory if needed.

mateacademy-ai-mentor · 2026-04-17T11:18:39Z

+
+    def handle(self, *args, **options):
+        self.stdout.write("Waiting for database...")
+        while True:


COPY . . is fine for image build, but if you later mount the project directory as a volume in docker-compose (bind mount), it will overwrite the image contents at runtime and make the image less independent/thin. Reconsider the bind mount in compose if your goal is to make the service independent of the local machine, or document that mounting is for development only.

mateacademy-ai-mentor · 2026-04-17T11:18:39Z

+
+
+class Command(BaseCommand):
+    help1 = "Wait for database to be available"


The management command sets help1 instead of the expected help attribute. Django expects help on BaseCommand to provide the description. Rename help1 to help so the command conforms to Django conventions.

mateacademy-ai-mentor · 2026-04-17T11:18:39Z

@@ -0,0 +1,19 @@
+import time


Minor/informational: the migration header says it was generated by Django 6.0.4 while project settings indicate Django 4.x. This version mismatch is unusual and may indicate the migration was generated with a different Django version. Verify migrations and Django version compatibility.

mateacademy-ai-mentor · 2026-04-17T11:18:43Z

@@ -0,0 +1,33 @@
+services:
+  cinema:


Remove Dockerfile from .dockerignore. If the Dockerfile is ignored it won't be included in the build context and docker build/docker-compose up --build may fail to find it.

mateacademy-ai-mentor · 2026-04-17T11:18:43Z

+    command: >
+       sh -c "python manage.py wait_for_db && python manage.py migrate &&
+                 python manage.py runserver 0.0.0.0:8000"
+    volumes:


Installing Python dependencies on Alpine often requires system build libraries (gcc, musl-dev, postgresql-dev, libffi-dev, openssl-dev, etc.). Add an apk add --no-cache ... step before pip install -r requirements.txt or use prebuilt wheels (e.g. psycopg2-binary) to avoid build failures on Alpine.

mateacademy-ai-mentor · 2026-04-17T11:18:43Z

+
+  db:
+    image: postgres:16.0-alpine3.17
+    environment:


The adduser flags used here are GNU/Debian-style and may not be supported on Alpine. Use Alpine-compatible options like adduser -D my_user (and addgroup/adduser as needed) or switch to a non-Alpine base image. Otherwise the image build may fail.

mateacademy-ai-mentor · 2026-04-17T11:18:43Z

+                 python manage.py runserver 0.0.0.0:8000"
+    volumes:
+      - ./:/app
+      - media_data:/files/media


COPY . . copies the project into the image, but your docker-compose also binds the host project directory into /app at runtime. That bind mount will overwrite the image contents and can cause permission/consistency issues. If the goal is a service independent of the local machine, avoid bind-mounting the project in production compose.

mateacademy-ai-mentor · 2026-04-17T11:18:43Z

+    env_file:
+      - .env
+    command: >
+       sh -c "python manage.py wait_for_db && python manage.py migrate &&


The management command defines help1 instead of the expected help attribute on BaseCommand. Rename help1 to help so the command follows Django conventions and manage.py help shows the description.

mateacademy-ai-mentor · 2026-04-17T11:18:43Z

@@ -0,0 +1,33 @@
+services:
+  cinema:


The docker-compose service is named cinema. The task examples and checks reference an app service (used in commands like docker-compose run app ...). Either rename the service to app or document the different name so the check commands work as expected.

mateacademy-ai-mentor · 2026-04-17T11:18:43Z

+    volumes:
+      - ./:/app


The cinema service does not expose the application port to the host. Add a ports mapping such as ports: - "8000:8000" so the app is reachable at 127.0.0.1:8000 as required by the task.

mateacademy-ai-mentor · 2026-04-17T11:18:43Z

+    env_file:
+      - .env
+    volumes:
+      - db_data:$PG_DATA


The DB volume mapping uses db_data:$PG_DATA, which references an undefined environment variable and is incorrect. Map the named volume to PostgreSQL's data directory inside the container, e.g. db_data:/var/lib/postgresql/data.

mateacademy-ai-mentor · 2026-04-17T11:18:43Z

+        "ENGINE": os.environ.get("SQL_ENGINE", "django.db.backends.sqlite3"),
+        "NAME": os.environ.get("SQL_DATABASE", BASE_DIR / "db.sqlite3"),


The database ENGINE and NAME default to SQLite if environment variables are not provided. Ensure your .env (used by docker-compose) sets SQL_ENGINE=django.db.backends.postgresql and SQL_DATABASE to the PostgreSQL DB name so Django uses Postgres in Docker. Without these env vars Django will try to use SQLite instead of the required PostgreSQL.

mateacademy-ai-mentor · 2026-04-17T11:18:44Z

+        "NAME": os.environ.get("SQL_DATABASE", BASE_DIR / "db.sqlite3"),
+        "USER": os.environ.get("SQL_USER", "user"),
+        "PASSWORD": os.environ.get("SQL_PASSWORD", "password"),
+        "HOST": os.environ.get("SQL_HOST", "localhost"),


Default HOST is localhost. Inside the app container Django should connect to the Postgres service by host name (the service name in docker-compose, e.g. db). Make sure your .env sets SQL_HOST=db, otherwise Django will attempt to connect to a DB on the same container and fail.

mateacademy-ai-mentor · 2026-04-17T11:18:47Z


 MEDIA_URL = "/media/"
-MEDIA_ROOT = BASE_DIR / "media"
+MEDIA_ROOT = "files/media"


MEDIA_ROOT is set to a relative path files/media. Your Dockerfile and docker-compose mount use /files/media (an absolute path). Change MEDIA_ROOT to the absolute path (e.g. /files/media) so Django reads/writes media files inside the container volume as intended.

mateacademy-ai-mentor · 2026-04-17T11:18:48Z

@@ -9,6 +9,7 @@
 For the full list of settings and their values, see


The app service runs Django on 0.0.0.0:8000 but there is no ports mapping for the service. Add ports: - "8000:8000" so the API is accessible on 127.0.0.1:8000 as required by the task.

mateacademy-ai-mentor · 2026-04-17T11:18:48Z

@@ -9,6 +9,7 @@
 For the full list of settings and their values, see
 https://docs.djangoproject.com/en/4.0/ref/settings/
 """


You bind-mount the project directory into the container (./:/app). This makes the container dependent on the host filesystem and contradicts the requirement that the service be fully independent of the local machine. For a production-like Docker setup remove the bind mount (use the image contents) or make it optional (development-only).

mateacademy-ai-mentor

Review Summary

I am requesting changes because there are a few critical issues that currently block the task from meeting the requirements.

Critical blockers that must be fixed:

In docker-compose.yml the main service is named cinema (around line 2), but the task and automated checks expect the service to be named app, so commands like docker-compose run app sh -c "python manage.py test" and docker-compose run app sh -c "flake8" will fail; rename the service key from cinema: to app:.
The CI flake8 run fails on cinema/management/commands/wait_for_db.py:8 with VNE003 because a variable shadows a Python builtin; rename that variable to a non-builtin name (e.g. db_ready instead of list/type/id) and update all its uses so flake8 passes.
Your Dockerfile likely needs OS build dependencies for DB drivers like psycopg2 on python:3.11-slim; before pip install -r requirements.txt, add an apt-get update && apt-get install -y build-essential libpq-dev && rm -rf /var/lib/apt/lists/* step so image builds don’t fail when compiling native extensions.

Important but slightly less blocking improvements:

You create my_user in the Dockerfile but never ensure /app is owned by that user or switch to it; add chown -R my_user:my_user /app and USER my_user near the end of the Dockerfile so the app does not run as root, and consider also chowning /files/media if that directory is written at runtime.
In .dockerignore, you currently ignore docker-compose.yml; remove that line so the compose file remains in the build context unless you have a very specific reason to exclude it.

You’ve done solid work setting up Docker, the wait_for_db command, volumes, and media configuration; once you address the service name, lint error, and Dockerfile dependency/user issues, your setup should satisfy the checklist and run reliably under Docker.

✨ Please rate this review in the Platform's notification center¹. I will be grateful for your feedback! ✨

Important

Fix the issues, commit the changes, and then re-request my review using the Re-request review button² in the Reviewers tab.

Tip

If you have any comments about this review, please leave a message in the Add a comment section below and mention me with the @mateacademy-ai-mentor tag³.
I will read your message during my next review of your pull request. Please do not reply directly to my comments, as that feature is not supported yet.

Caution

Do not close the pull request until the review is complete. Closing it early can lead to unexpected behavior and disrupt the review process.

mateacademy-ai-mentor · 2026-04-17T12:09:16Z

@@ -0,0 +1,41 @@
+# Generated by Django 6.0.4 on 2026-04-16 22:41


If requirements.txt includes packages that need compilation (for example psycopg2), you must install system build dependencies before running pip install. Since the base image is Debian-based (python:3.11-slim), add apt-get steps to install packages like build-essential, libpq-dev (and clean up after). Without these, pip install may fail during image build.

mateacademy-ai-mentor · 2026-04-17T12:09:16Z

+    operations = [
+        migrations.AlterField(
+            model_name='movie',
+            name='actors',
+            field=models.ManyToManyField(blank=True, related_name='movies', to='cinema.actor'),
+        ),
+        migrations.AlterField(


You create the my_user account but never switch to it or ensure the application files are owned by that user. For best practice add chown -R my_user /app (or make /app owned earlier) and USER my_user so the container does not run as root. Also ensure the adduser flags you use are compatible with the base image (Debian vs Alpine).

mateacademy-ai-mentor · 2026-04-17T12:09:16Z

+import django.db.models.deletion
+from django.conf import settings
+from django.db import migrations, models
+


You currently ignore docker-compose.yml in .dockerignore. It's not harmful but usually unnecessary to ignore docker-compose.yml — consider removing that line so the compose file is present in the build context (or keep it intentionally if you have a reason). This is low severity but worth checking.

mateacademy-ai-mentor · 2026-04-17T12:09:16Z

+class Command(BaseCommand):
+    help = "Wait for database to be available"
+
+    def handle(self, *args, **options):


If your requirements include packages like psycopg2 (common for PostgreSQL), this pip install step will fail because the image currently does not install system build dependencies (libpq headers, gcc, etc.). On Debian-slim you should run apt-get update && apt-get install -y build-essential libpq-dev (and clean apt caches) before pip install (or switch to psycopg2-binary).

mateacademy-ai-mentor · 2026-04-17T12:09:17Z

+                break
+            except OperationalError:
+                self.stdout.write("Database unavailable, waiting 1 second...")
+                time.sleep(1)


You create a user with adduser ... my_user. Make sure the flags used are supported by this base image (python:3.11-slim is Debian-based so these flags are likely fine). Still: it is better to set ownership of the application dir (/app) and switch to the non-root user with USER my_user so the container doesn't run as root. Also consider creating the user non-interactively and ensuring home/uid if needed.

mateacademy-ai-mentor · 2026-04-17T12:09:17Z

+      - "8000:8000"
+
+  db:
+    image: postgres:16.0-alpine3.17


You create a my_user account but never change ownership of /app nor switch to that user. For better security and to avoid permission issues, add chown -R my_user:my_user /app (or ensure files copied are owned by that user) and add USER my_user before the final image runtime.

mateacademy-ai-mentor · 2026-04-17T12:09:17Z

+      POSTGRES_USER: "rarturus"
+      POSTGRES_PASSWORD: "password"


You only chown /files/media, not the application directory. If you plan to run the container as my_user, also chown -R my_user /app so the process can access app files.

mateacademy-ai-mentor · 2026-04-17T12:09:17Z

@@ -0,0 +1,34 @@
+services:
+  cinema:


The main service is named cinema. The task (and test commands) expect the main service to be named app so commands like docker-compose run app ... and checks for app will work. Rename the service to app or update the acceptance instructions accordingly.

mateacademy-ai-mentor · 2026-04-17T12:09:17Z

+    env_file:
+      - .env
+    volumes:
+      - db_data:/var/lib/postgresql/data


Good: the Postgres service volume is mapped to /var/lib/postgresql/data so DB data will persist correctly as required by the checklist.

mateacademy-ai-mentor · 2026-04-17T12:09:17Z

+       sh -c "python manage.py wait_for_db && python manage.py migrate &&
+                 python manage.py runserver 0.0.0.0:8000"
+    volumes:
+      - media_data:/files/media


Good: the app mounts media_data:/files/media and MEDIA_ROOT is set to /files/media, so uploaded media will be stored in the mounted volume. Ensure the runtime user has write permission to that path.

mateacademy-ai-mentor

Review Summary

I am approving your solution as an educational override so you can keep progressing while you address a few remaining issues.

You did a solid job wiring up Docker Compose with app and db services, implementing and using the wait_for_db management command correctly, and configuring media volumes and a non-root user in the Dockerfile. The main critical gap is in your Dockerfile: before the pip install -r requirements.txt line (around the first RUN pip install section), you need to install OS build dependencies like build-essential and libpq-dev and then clean apt caches, so PostgreSQL drivers such as psycopg2 can compile successfully [CHECKLIST ITEM: Dockerfile must install OS build dependencies before pip install]. Another important fix is to ensure /files/media is owned by the non-root user (e.g. by adding a chown -R my_user:my_user /files/media before USER my_user), otherwise file uploads may fail at runtime due to permissions. In cinema_service/settings.py, make sure your Docker environment sets SQL_ENGINE=django.db.backends.postgresql (and related DB vars) so you consistently use PostgreSQL instead of silently falling back to SQLite. As a minor improvement, clean up the stray backticks at the end of .dockerignore and remember that docker-compose run app ... won’t auto-start the db service, so you should start it with docker-compose up -d db (or up -d) before running tests.

Overall, you’re very close: once you add the OS deps step, fix media ownership, and verify flake8 and tests via docker-compose run app sh -c "flake8" and docker-compose run app sh -c "python manage.py test", your setup will be in great shape—nice work getting this far.

✨ Please rate this review in the Platform's notification center¹. I will be grateful for your feedback! ✨

Important

Fix the issues, commit the changes, and then re-request my review using the Re-request review button² in the Reviewers tab.

Tip

If you have any comments about this review, please leave a message in the Add a comment section below and mention me with the @mateacademy-ai-mentor tag³.
I will read your message during my next review of your pull request. Please do not reply directly to my comments, as that feature is not supported yet.

Caution

Do not close the pull request until the review is complete. Closing it early can lead to unexpected behavior and disrupt the review process.

mateacademy-ai-mentor · 2026-04-17T12:57:35Z

+class Command(BaseCommand):
+    help = "Wait for database to be available"
+
+    def handle(self, *args, **options):


Before running pip install -r requirements.txt you must install OS build dependencies required for DB drivers on python:3.11-slim. Add a RUN step before line 10 such as:

RUN apt-get update && apt-get install -y build-essential libpq-dev && rm -rf /var/lib/apt/lists/*

This ensures packages like psycopg2 can compile and keeps image layers clean as required by the checklist.

mateacademy-ai-mentor · 2026-04-17T12:57:35Z

@@ -9,6 +9,7 @@
 For the full list of settings and their values, see
 https://docs.djangoproject.com/en/4.0/ref/settings/


Critical: the Dockerfile runs pip install -r requirements.txt without first installing OS build dependencies needed by DB drivers (e.g. psycopg2). Per the checklist you must add a step before pip install such as: apt-get update && apt-get install -y build-essential libpq-dev && rm -rf /var/lib/apt/lists/* so the image builds successfully on python:3.11-slim.

mateacademy-ai-mentor · 2026-04-17T12:57:35Z

+WORKDIR /app
+
+COPY requirements.txt .
+RUN pip install --no-cache-dir -r requirements.txt


Critical: you must install OS build dependencies before running pip install so native DB drivers (like psycopg2) can be built. Add a RUN step such as: apt-get update && apt-get install -y build-essential libpq-dev && rm -rf /var/lib/apt/lists/* before the pip install line to avoid build failures on python:3.11-slim.

mateacademy-ai-mentor · 2026-04-17T12:57:35Z

+        my_user
+
+RUN chown -R my_user:my_user /app
+RUN chmod -R 755 /files/media


Permissions: you create /files/media and later run USER my_user, but you never chown the media directory to the non-root user. Add chown -R my_user:my_user /files/media (or include it with the existing chown) before switching to USER my_user so the app can write uploaded files at runtime.

mateacademy-ai-mentor · 2026-04-17T12:57:35Z

+    depends_on:
+      - db


Operational note: depends_on ensures ordering for docker-compose up but docker-compose run app ... does not start dependent services automatically. To run docker-compose run app sh -c "python manage.py test" as required, ensure the db service is already running (for example docker-compose up -d db) or start services with docker-compose up -d before running tests.

vsmutok

Tests have failed.
Please make sure your code passes all tests before submitting the task for review.

vsmutok

Great!

Solution

f7377f7

mateacademy-ai-mentor suggested changes Apr 17, 2026

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mateacademy-ai-mentor reviewed Apr 17, 2026

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7df48dd

Rar571 requested a review from mateacademy-ai-mentor April 17, 2026 12:05

mateacademy-ai-mentor suggested changes Apr 17, 2026

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Rar571 requested a review from mateacademy-ai-mentor April 17, 2026 12:54

mateacademy-ai-mentor suggested changes Apr 17, 2026

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Rar571 requested a review from mateacademy-ai-mentor April 17, 2026 13:07

vsmutok suggested changes Apr 18, 2026

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Rar571 requested a review from vsmutok April 28, 2026 18:30

vsmutok approved these changes Apr 29, 2026

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		@@ -0,0 +1,19 @@
		import time
		from django.core.management.base import BaseCommand



		class Command(BaseCommand):
		help1 = "Wait for database to be available"

		"ENGINE": os.environ.get("SQL_ENGINE", "django.db.backends.sqlite3"),
		"NAME": os.environ.get("SQL_DATABASE", BASE_DIR / "db.sqlite3"),

		@@ -9,6 +9,7 @@
		For the full list of settings and their values, see

		@@ -0,0 +1,41 @@
		# Generated by Django 6.0.4 on 2026-04-16 22:41

		@@ -9,6 +9,7 @@
		For the full list of settings and their values, see
		https://docs.djangoproject.com/en/4.0/ref/settings/

		FROM python:3.11.6-alpine3.18

		LABEL maintainer="rarturus"

		ENV PYTHONUNBUFFERED 1

		WORKDIR /app

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Rar571 commented Apr 17, 2026

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Review Summary

Footnotes

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