[英]Multiple columns from join tables are not returned by activerecord in rails3
我有這個查詢,當在mysql cli中運行時會給出正確的結果,但在由rails執行時卻不能
查詢:
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
我用了
t1.find_by_sql "<above_sql_query>"
但它僅返回與t1有關的列。 結果是一個數組:
[#<t1 id: 3, event_id: 3>]
我也嘗試過
t1.find(:all, :select => "<select attributes as above>", :joins => "as above", :conditions => "as above", :limit => 15, :order => "t1.created_at DESC")
但仍然給出相同的結果,只返回與t1有關的屬性。 請幫助我找到執行該命令的最佳方法。
謝謝,pR
.includes
的使用為我解決了這個問題。
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