如何在Ruby On Rails 3中为表MySQL表设置别名？

data = TUP.all :select => 
  \"DATE(tup.created_at) as date
   , ROUND(SUM(fo_count)/#{authors_count}) AS followers\"
   ,:joins => \"INNER JOIN tlsts AS tl ON tl.user_id = tup.user_id\"
   ,:conditions => condition

set_table_name :table_name

  class UserRole < ActiveRecord::Base
    set_table_name :user_roles # Add user_roles table to UserRole model so, you can make query to that table like: @user_roles = UserRole.all/ @user_role = UserRole.find(params[:id]) etc.
  end