I'm going to use these methods in my app instead of the current_user 
method in the book:

#getter method:
def current_user
  @current_user
end

#setter method:
def current_user=(user)
  @current_user = user
end


def update_current_user
  user = current_user #calls getter method
  return user if user

  cookie_arr = cookies.signed[:remember_token]

  if cookie_arr
    self.current_user = User.authenticate_with_salt(*cookie_arr)
    #calls setter method

    return current_user  #calls getter method
  else
    return nil
  end

end


Any time the book calls current_user, I plan on calling 
update_current_user
instead.

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