Installing PostgreSQL on Mac OS Yosemite

I faced some headache installing PostgreSQL on my Mac via Homebrew (a package manager for MacOS kinda like apt-get for linux). After installed, I tried to use its console and:

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PostgreSQL error: Fatal: role “username” does not exist

After wander around the web and some StackOverflow questions later, I solved the problem by running in the console:

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createdb

The problem was that Postgres was looking for the default database which is named after your user name. createdb without any arguments, does the trick by creating a database with your user name.