gistfile1.txt

# Instance variables in models 
# recently i came across code where a friend of mine had written  a lot code in models like its below  ( without any attr_reader or accessor ) , is this ok or just plain useless,

  def coordinates
    @coordinates = [latitude, longitude]
  end

# should we do  something like below make more sense 

  def coordinates 
    @coordinates  ||= [latitude, longitude]
  end

# or just this is fine 
 
  def coordinates
    [latitude, longitude]
  end

# which one of them is better to use in rails, advantages or disadvantages