Multiple columns from join tables are not returned by activerecord in rails3

Question

I have this query which when run in mysql cli gives the proper result but not when executed by rails

Query:

SELECT t1.id, t1.event_id, t2.content, t2.created_at, t3.title FROM t1 
INNER JOIN t2 ON t2.id = t1.event_id 
INNER JOIN t3 ON t3.id = t2.id 
WHERE (t1.id in (SELECT id FROM t4 WHERE attr = 20)) 
ORDER BY t1.created_at DESC 
LIMIT 15

I used

t1.find_by_sql "<above_sql_query>"

but it only returns those columns that concern t1. The result is an array:

[#<t1 id: 3, event_id: 3>] 

I also tried with

t1.find(:all, :select => "<select attributes as above>", :joins => "as above", :conditions => "as above", :limit => 15, :order => "t1.created_at DESC")

but still gives the same result, only returns attributes concerning t1. Please help me in finding the best way to execute that command.

Thanks, pR

Answer 1

.includes的使用为我解决了这个问题。