use one-off jobs for migrations

Author: jordanstephens

samples/django-channels-redis-postgres/.claude/settings.local.json

@@ -0,0 +1,8 @@
+{
+  "permissions": {
+    "allow": [
+      "Bash(docker compose:*)"
+    ],
+    "deny": []
+  }
+}

samples/django-channels-redis-postgres/app/Dockerfile

@@ -1,5 +1,5 @@
 # Use a smaller base image
-FROM python:3.10-slim-buster
+FROM python:3.10-slim-bullseye
 
 # Set environment variables
 ENV PYTHONDONTWRITEBYTECODE=1
@@ -12,7 +12,8 @@ RUN apt-get update \
     && apt-get install -y \
         gcc \
         python3-dev \
-        libpq-dev
+        libpq-dev \
+        netcat-openbsd
 
 # Install dependencies
 COPY requirements.txt /app/
@@ -32,4 +33,4 @@ RUN adduser --disabled-password --gecos '' django
 USER django
 
 # Start server
-CMD ["sh", "-c", "python manage.py migrate && daphne -b 0.0.0.0 -p 8000 django_defang.asgi:application"]
+CMD ["sh", "-c", "daphne -b 0.0.0.0 -p 8000 django_defang.asgi:application"]

samples/django-channels-redis-postgres/compose.dev.yaml

@@ -13,8 +13,16 @@ services:
     depends_on:
       - redis-service
       - postgres-service
-    command: sh -c "python manage.py migrate && python manage.py runserver 0.0.0.0:8000"
+      - migrate
+    command: sh -c "python manage.py runserver 0.0.0.0:8000"
 
+  migrate:
+    extends:
+      file: compose.yaml
+      service: migrate
+    environment:
+      - POSTGRES_URL=postgres://djangouser:djangopassword@postgres-service:5432/djangodatabase
+  
   redis-service:
     extends:
       file: compose.yaml

samples/django-channels-redis-postgres/compose.yaml

@@ -22,6 +22,7 @@ services:
     depends_on:
       - redis-service
       - postgres-service
+      - migrate
 
   redis-service:
     image: redis:6.2
@@ -31,6 +32,18 @@ services:
       - mode: host
         target: 6379
 
+  migrate:
+    restart: "no"
+    build:
+      context: ./app
+      dockerfile: Dockerfile
+    command: python manage.py migrate
+    depends_on:
+      - postgres-service
+    environment:
+      - POSTGRES_URL=postgres://djangouser:${POSTGRES_PASSWORD}@postgres-service:5432/djangodatabase?
+      - SECRET_KEY
+
   postgres-service:
     image: postgres:16.4
     # uncomment the following line in BYOC