[ruby-on-rails] Postgres could not connect to server

I faced the same problem for psql (PostgreSQL) 9.6.11.

what worked for me -

remove postmaster.pid -- rm /usr/local/var/[email protected]/postmaster.pid

restart postgres -- brew services restart [email protected]

If this also doesn't work then run -- sudo chmod 700 /usr/local/var/[email protected]

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