require 'rake'

rake = Rake.application
rake.init
# you can import addition *.rake files
# app.add_import 'some/other/file.rake'
rake.load_rakefile
rake['db:test:prepare'].invoke()

All examples here for deploy RoR application with unicorn, staging machine (where we deploys) available via ssh by ssh_key.

1. Deploy via remote_cache:

    require 'rvm/capistrano'
    require 'bundler/capistrano'
   
    set :application, '_proj_'
    set :rails_env, 'production'
    set :domain, '_user@your_deploy_domain_'
    set :deploy_to, "_path_to_#{application}"
    set :use_sudo, false
    set :unicorn_conf, "#{deploy_to}/current/config/unicorn.rb"
    set :unicorn_pid, "#{deploy_to}/shared/pids/u...
   

Assume your database.yml file looks like this:

{: .yaml}
development:
adapter: postgresql
host: localhost
encoding: unicode
database: proj_development
pool: 5
username: proj
password:
template: template0

test:
  adapter:  postgresql
  host:     localhost
  encoding: unicode
  database: proj_test
  pool:     5
  username: proj
  password:
  template: template0

production:
  adapter:  postgresql
  host:     localhost
  encoding:...