Rails not able to access Postgresql deployed by Docker - ruby-on-rails

Question

I have a docker container that spins up my Postgres DB, Elasticsearch, and Redis; however, my rails server is unable to connect to the Postgres DB... The server starts, but when it attempts to connect to the DB, I get the error
PG::ConnectionBad (could not connect to server: No such file or directory
Is the server running locally and accepting
connections on Unix domain socket "/tmp/.s.PGSQL.5432"?
):
When Docker launches the DB, it does so on localhost:5432. Via the terminal, I'm able to connect to the DB by running psql -h localhost -U myUser, but running psql results in the same error...
My rails database.yml file is configured to connect to the database at localhost:5432 with myUser, but I cannot figure out why it is giving me this error. It seems like Rails is attempting to connect to my Postgres.app server instead of the server Docker is running.
Here is my database.yml file
default: &default
adapter: postgis // I have tried "postgresql" as well
encoding: unicode
reconnect: true
pool: <%= ENV.fetch("RAILS_MAX_THREADS") { 5 } %>
url: <%= ENV['DATABASE_URL'] %>
development:
<<: *default
database: my_db
username: <my username>
password: <my password>
Here is my .env
DATABASE_URL=postgres://***:***#novus-postgis-localdev:5432
My docker container shows the following
ENVIRONMENT:
DATABASE_URL: postgres://<my username>:<my password>#novus-postgis-localdev:5432
PATH:
/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
...
PORTS:
5432/tcp: 0.0.0.0:5432
5432/tcp: :::5432
Therefore, my Rails environment is supposed to connect to my docker DB server, but it appears to be attempting to connect to my Postgres.app server (which isn't running).
What am I missing here / what is wrong with my configurations that have Rails looking at the wrong server?
FWIW, I'm on macOS and I installed Postgres via the Postgres.app.
When the Postgres.app is running a server, the psql command connects to it.
When the Docker container is running, I am unable to start the Postgres. App server because port 5432 is already used (as expected)
UPDATE
I did find out that my Docker DB container is listening on Unix socket "/var/run/postgresql/.s.PGSQL.5432" whereas my Rails is pointing to the socket /tmp/.s.PGSQL.5432. I am unable to figure out how to change either of these to be the same (rails to look at /var/run/postgresql/... or docker to launch socket at /tmp/...

Answer 1

In the Postgresql configuration file, try and enter,
listen_addresses='*';