postgresql - how install postgres (for rails) on vagrant so "vagrant" role does not have to be manually created? -

postgresql - how install postgres (for rails) on vagrant so "vagrant" role does not have to be manually created? -

how can install postgres under vagrant runs in development mode same running postgres.app... no user or password required?

moving rails 3.2.21 development environment on vagrant, if leave database.yml file as-is, error fatal: role "vagrant" not exist when run rake db:create

if modify config/database.yml adding

username: postgres password: postgres

it works. "breaks" database connection developer not using vagrant (becasue using postgres.app on development machine not utilize user or password). , want abel run vagrant up without having manually create postgres user using psql each , every time.

is there, example, way have vagrant-specific database.yml gets used when running rake , rails under vagrant?

postgresql vagrant