Switching Postgresql on a Mac

Earlier today I decided to switch from Postgres.app to a simple homebrew install of postgresql. Not because I'm not satisfied with the app but I think it's just a bit overkill to start up a database. Together with the lunchy gem (a launchctl wrapper) I found yesterday switching should be a piece of cake. So I threw Postgres.app in the trashbin. Entered brew install postgresql and everything was supposed to be unicorns and rainbows.

However I kept getting this error when trying to interact with the database via Rails: could not connect to server: No such file or directory Is the server running locally and accepting connections on Unix domain socket "/var/pgsql_socket/.s.PGSQL.5432"? I had absolutely no clue where to look but after a while of messing around I figured it out, the pg gem I use with Rails was installed with the old Postgresql installed. And now I switched databases it couldn't connect anymore. The solution is simple, just uninstall the pg gem and reinstall it.