Rails: Postgres database connection in Rails 3

gistfile1.yml

development:
  adapter: postgresql
  encoding: unicode
  database: your_database_name
  pool: 5
  username: your_username
  password: your_password
 
  # Connect on a TCP socket. Omitted by default since the client uses a
  # domain socket that doesn't need configuration. Windows does not have
  # domain sockets, so uncomment these lines.
  #host: localhost
  #port: 5432
 
  # Schema search path. The server defaults to $user,public
  #schema_search_path: myapp,sharedapp,public
 
  # Minimum log levels, in increasing order:
  #   debug5, debug4, debug3, debug2, debug1,
  #   log, notice, warning, error, fatal, and panic
  # The server defaults to notice.
  #min_messages: warning