ruby on rails - How to query to get all users based on a nested resource? -

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given: 

  room (id, update_at) roommember (room_id, user_id) user (Id)   
 How can I get all the users of the last updated  all rooms  in the last 24 hours in the train?  
 Thanks   
 
 
  Selection ('Specific User. *') Joins (: rooms) .where ('rooms.updated_at & gt ;?', 1.day.ago)

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