[英]How do I implement this SQL query in Ruby on Rails
我在這里有這個美味的SQL查詢，我試圖找出如何使用其活動記錄方法在Rails中實現==> .select（）.where（）等...
SELECT topics.id FROM topics WHERE NOT EXISTS ( SELECT * FROM votes WHERE votes.topic_id = topics.id )
嘗試這個
@topics = Topic.where("not exists (SELECT * FROM votes WHERE votes.topic_id = topics.id)")
Ruby on Rails 2.3.8：如何進行自定義SQL查詢，作為對象/ ActiveRecord對象返回，而不是哈希？
[英]Ruby on Rails 2.3.8: How do I do a custom SQL query, returned as an object / ActiveRecord object, rather than a hash?
如何在Ruby Join查詢中編寫此SQL查詢（Ruby on Rails）
[英]How to write this sql query in Ruby Join query (Ruby on Rails)
如何使用UNION在查詢上實現SQL_CALC_FOUND_ROWS？
[英]How do I implement SQL_CALC_FOUND_ROWS on a query with UNION?
Ruby on Rails / MySQL：如何使用OR在數組上進行搜索？
[英]Ruby on Rails / MySQL: how do I do a search on an array using OR?
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