version: "3"

services:
  app:
    build:
      context: .
    ports: 
      - "8000:8000" 
    volumes:
      - ./app:/app 
    command: > 
      sh -c "python3 manage.py wait_for_db &&
            python3 manage.py migrate &&
            python3 manage.py runserver 0.0.0.0:8000"
    environment:
      - DB_HOST=db 
      - DB_NAME=app 
      - DB_USER=postgres 
      - DB_PASS=mypassword

    depends_on: 
      - db 

  db:
    image: postgres:10-alpine
    environment:
      - POSTGRES_DB=app 
      - POSTGRES_USER=postgres
      - POSTGRES_PASSWORD=mypassword