ActiveRecord查詢

Question

任何人都知道如何使用ActiveRecord而不是使用SQL創建此查詢？

@leaderboard = ActiveRecord::Base.connection.execute("SELECT name, street, town, county,  avg(volume_used) FROM `DBName`.`events 
join DBName.households on idhouseholds = events.household_id 
group by household_id 
order by volume_used ASC;"); 

Answer 1

......怎麼

@leaderboard = Event.select([:name,:street,:town,:county,'avg(volume_used) as avg_used']).joins(:households).group('events.household_id').order('volume_used asc') 

把由idhouseholds你實際上意味着households.id以及您希望通過您選擇的合計平均場訂購。