How to set up using a different database in rails from the default

myclass_base.rb

    class MyclassBase < ActiveRecord::Base
      self.abstract_class = true
      CONFIG_PATH = File.join(Rails.root, 'config', 'database_myclass.yml') unless defined? CONFIG_PATH

      # So you can use environment variables in your YML file.
      erb = ERB.new(File.read(CONFIG_PATH)).result
      config = ActiveSupport::HashWithIndifferentAccess.new(YAML.load(erb))[Rails.env]

      raise ConfigurationNotFound.new("Configuration not found for config_path: '#{CONFIG_PATH}'") unless config

      establish_connection(
        adapter:  config[:adapter],
        username: config[:username],
        password: config[:password],
        dataserver: config[:dataserver],
        database: config[:database]
      )
    end