mysql - 如何在 Ruby On Rails 3 中为 MySQL 表设置别名？

Question

如何在 Ruby On Rails 3 中为 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

我的意思是:在此代码中，我可以在哪里为表 TwitterUserProfile 设置别名 tup？
对于什么参数 :from=>？

Answer 1

在您想要关联该表的模型中使用set_table_name :table_name。例如:

  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