Use postgis with nitrous.io

.bashrc

export DATABASE_URL=username:password@host:port/dbname

readme.txt

Daniel Azuma wrote the necessary gems and has a blog series on postgis/rails.  Follow his instructions for the "normal" setup: http://blog.daniel-azuma.com/archives/69

add_me_to_application.rb

#From: https://devcenter.heroku.com/articles/postgis?preview=1#setting-up-postgis-with-rails

#possible bugs: http://stackoverflow.com/questions/16547916/undefined-method-when-trying-to-build-db-with-activerecord-postgis-adapter

# in config/application.rb, before the application loads
class ActiveRecordOverrideRailtie < Rails::Railtie
  initializer "active_record.initialize_database.override" do |app|

    ActiveSupport.on_load(:active_record) do
      if url = ENV['DATABASE_URL']
        ActiveRecord::Base.connection_pool.disconnect!
        parsed_url = URI.parse(url)
        config =  {
            adapter:             'postgis',
            host:                parsed_url.host,
            encoding:            'unicode',
            database:            parsed_url.path.split("/")[-1],
            port:                parsed_url.port,
            username:            parsed_url.user,
            password:            parsed_url.password
        }
        establish_connection(config)
      end
    end
  end
end

rgeos_installation

From: https://github.com/dazuma/rgeo

gem install rgeo -- --with-geos-dir=/path/to/my/geos/installation

#note the -- to separate the build commands from the gem commands