Logs say "fe_sendauth: no password supplied" but rails console working without problems - ruby-on-rails

Question

I'm trying to deploy rails app with capistrano, nginx and puma. When I visit the app I get errors like this in my production.log:
[11c972c9-c8fb-404f-93c3-9fc614ad815b] ActiveRecord::ConnectionNotEstablished (connection to server at "localhost" (127.0.0.1), port 5432 failed: fe_sendauth: no password supplied
):
When I log to this machine and run bin/rails console it works without any problems, I can create records, query records. Connection to database works without problems.
RAILS_ENV is set to production in /etc/environment
Any idea what could be the problem?
database.yml
default: &default
adapter: postgresql
encoding: unicode
host: localhost
password: <%= ENV['APP_DATABASE_PASSWORD'] %>
pool: <%= ENV.fetch("RAILS_MAX_THREADS") { 5 } %>
production:
<<: *default
database: app_production
username: app
pg_hba.conf
local all postgres peer
# TYPE DATABASE USER ADDRESS METHOD
# "local" is for Unix domain socket connections only
local all all peer
# IPv4 local connections:
host all all 127.0.0.1/32 scram-sha-256
# IPv6 local connections:
host all all ::1/128 scram-sha-256
# Allow replication connections from localhost, by a user with the
# replication privilege.
local replication all peer
host replication all 127.0.0.1/32 scram-sha-256
host replication all ::1/128 scram-sha-256

Answer 1

The solution for me was to delete PostgreSQL completely using,
sudo apt-get --purge remove postgresql\*
Click yes on that pop-up, re-install PostgreSQL using,
sudo apt update
then,
sudo apt install postgresql postgresql-contrib
then,
sudo service postgresql start
Finally, you'll also need to create a database user so that you are able to connect to the database from Rails. First, check what your operating system username is:
whoami
If your username is "stack", for example, you'd need to create a Postgres user with that same name. To do so, run this command to open the Postgres CLI:
sudo -u postgres -i
From the Postgres CLI, run this command (replacing "stack" with your username):
createuser -sr stack
Then enter control + d or type logout to exit.