Docker - access Postgres on Host

docker-compose.yml

services:
  service_name:
    image: image_uri
    ports:
      - "host_port:docker_port"
    extra_hosts:
      - "host.docker.internal:172.17.0.1" # obtained using $ ifconfig docker0
#    network_mode: "host"  # this is no longer needed
    environment:
      DATABASE_URL: postgresql://user:password@host.docker.internal:5432/db
      DATABASE_TYPE: postgresql
# also make sure postgres configs accept connections from "*"