p = Person.find_by_id(1, :include => :bags, :conditions => [ bag.id in (?), [3,4])
我想知道如何确保此查询只有在items.id3&;4而不是3或/和4。
谢谢
p = Person.find_by_id(1, :include => :bags, :conditions => [ bag.id in (?), [3,4])
我想知道如何确保此查询只有在items.id3&;4而不是3或/和4。
谢谢
您需要手动构造到bags_persons表的2个内部联接:
Person.find_by_id(1, :joins => "INNER JOIN bags_persons bp1 ON bp1.person_id=persons.id INNER JOIN bags_persons bp2 ON bp2.person_id=persons.id", :conditions => "bp1.bag_id=3 AND bp2.bag_id=4")
希望这能有所帮助
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