轉換SQL查詢ActiveRecord的查詢導軌4

Question

我有這樣的SQL查詢：

 sub = "(select Name from other_holders s where s.share_holder_id=share_holders.id and s.other_holder_type_id=1) as secondHolderName" 
     sub1 = "(select Name from other_holders s where s.share_holder_id=share_holders.id and s.other_holder_type_id=2) as thirdHolderName"  
     @shareHolders=ShareHolder.select("Folio_no,Name,#{sub},#{sub1}")   

我從這個查詢獲得所需的結果，但隨着this.I想這整個查詢轉換爲我不滿意Activerecord查詢。請幫助我。

Answer 1

class ShareHolder < ActiveRecord::Base 
    has_many :second_holders, class_name: OtherHolder, ->{where(older_holder_type_id: 1)} 
    has_many :third_holders, class_name: OtherHolder, ->{where(other_holder_type: 2)} 
end