Rails and PostgreSQL: Role postgres does not exist

Question

I have installed PostgreSQL on my Mac OS Lion, and am working on a rails app. I use RVM to keep everything separate from my other Rails apps.

For some reason when I

Answer 1

After a bunch of installing and uninstalling of Postgres, here's what now seems to work consistently for me with Os X Mavericks, Rails 4 and Ruby 2.

1. In the database.yml file, I change the default usernames to my computer's username which for me is just "admin".

2. In the command line I run rake db:create:all

3. Then I run rake db:migrate

4. When I run the rails server and check the local host it says "Welcome aboard".