將原始SQL轉換爲named_scope

Question

如何將此原始SQL轉換爲named_scope？

select d.*, count(*) shots_count 
    from duels d, duel_shots ds 
    where d.id = ds.duel_id 
    group by d.id 
    having (d.shots = 1 and shots_count >= 2) or (d.shots = 3 and shots_count >= 6) 

Answer 1

我想你想要一個加入，順便說一句。試試看：

class Duel < ActiveRecord::Base 
    has_many :duel_shots 

    named_scope :blah, 
    :select => 'duels.*, count(duels.id) shots_count', 
    :joins => :duel_shots, 
    :group => 'duels.id', 
    :having => '(duels.shots = 1 AND shots_count >= 2) OR (duels.shots = 3 AND shots_count >= 6)' 

end