def face_to_face(team_a,team_b)
      res=[]
      self.gamedays.each do |gd|
        res << gd.games.select {|g| (g.team_a == team_a && g.team_b == team_b) || (g.team_a == team_b && g.team_b == team_a)}
      end
      res.flatten
    end
def face_to_face(team_a,team_b)
      res=[]
      self.gamedays.each do |gd|
        res << gd.games.select {|g| (g.team_a == team_a && g.team_b == team_b) || (g.team_a == team_b && g.team_b == team_a)}
      end
      res.flatten
    end
return matchups between two teams