Easily namespace your Rails models

If you implement the class method tablenameprefix inside a regular module:

module Invoice
  def self.table_name_prefix
    'invoice_'
  end
end

Then any models you nest inside that module will prepend that prefix onto their table name:

module Invoice
  class Customer < ActiveRecord::Base
  end
end

Invoice::Customer.table_name # => "invoice_customers"

This is an easy and straightforward way to namespaces models in both your database and application.