Ruby on Rails and MAMP Pro

Question

hey all,

new to ruby, and rails... but not to the amp stack.

my preferred method for local development has always been to use MAMP Pro for it's ease of use and speed. but, i seem to have some more configuration to do if i want it to work with ROR.

i've got my server name setup (rails.dev) to use port 3000 and the disk location is set to the public folder of the rails installation.

http://rails.dev/ leads to a page that says 'Error establishing a database connection.'

what are the next steps?

any help would be appreciated, thanks!