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SELECT da subconsulta no Codeigniter Active Record


Consegui fazer a consulta funcionar colocando o from sub_query na instrução select inicial:
$this->db->select("*, 
  (select image_path from image where image_table = 'model' and image_table_id = model_id
  group by image_table_id limit 1) as ModelImg FROM 
  (SELECT * FROM $view where offer_table = 'derivative' order by offer_order) x");