railsしりとり PostgreSQLにきりかえ

SHOKAI-MAG /home/sho/src/shiritori% sudo -u postgres createuser shiritori_user -P
[sudo] password for sho:
Enter password for new role: 
Enter it again: 
Shall the new role be a superuser? (y/n) n
Shall the new role be allowed to create databases? (y/n) n
Shall the new role be allowed to create more new roles? (y/n) n
CREATE ROLE
SHOKAI-MAG /home/sho/src/shiritori% sudo -u postgres createdb shiritori_dev -O shiritori_user
CREATE DATABASE
SHOKAI-MAG /home/sho/src/shiritori% sudo -u postgres createdb shiritori_test -O shiritori_user
CREATE DATABASE
SHOKAI-MAG /home/sho/src/shiritori% sudo -u postgres createdb shiritori_product -O shiritori_user
CREATE DATABASE

sudo emacs /etc/postgresql/8.2/main/pg_hba.conf

local   all         all                               trust

sudo /etc/init.d/postgresql-8.2 restart

config/database.yml

# SQLite version 3.x
#   gem install sqlite3-ruby (not necessary on OS X Leopard)
development:
  adapter: postgresql
  database: shiritori_dev
  username: shiritori_user
  password: shiritori_pass
  timeout: 5000

# Warning: The database defined as 'test' will be erased and
# re-generated from your development database when you run 'rake'.
# Do not set this db to the same as development or production.
test:
  adapter: postgresql
  database: shiritori_test
  username: shiritori_user
  password: shiritori_pass
  timeout: 5000

production:
  adapter: postgresql
  database: shiritori_product
  username: shiritori_user
  password: shiritori_pass
  timeout: 5000