Movie ratings practice for codecademy

movie_ratings.rb

movies = { Pocahontus: 4,
    The_Lion_King: 3,
    Grinch: 2,
    Jumper: 1
    }
    
    puts "What would you like to do?"
    choice = gets.chomp
    
    case choice
    when "add"
      puts "What movie would you like to add?"
      title = gets.chomp
      if movies[title.to_sym].nil?
        puts "What rating do you want to give the movie(from 0 to 4)"
        rating = gets.chomp
        movies[title.to_sym] = rating.to_i
      else
        puts "That movie already exists!"
      end
    
    when "update"
      puts "What title would you like to update?"
      title = gets.chomp
      if movies[title.to_sym].nil?
        puts "That movie doesn't exist!"
      else
        puts "What rating do you want to change #{title} to?"
        rating = gets.chomp
        movies[title.to_sym] = rating.to_i
        puts "#{title.to_sym}'s rating has been changed to #{rating.to_i}" 
      end
      
    when "display"
      movies.each do |movie, rating|
        puts "#{movie}: #{rating}"
      end
      
    when "delete"
      puts "What movie would you like to delete?"
      title = gets.chomp
      if movies[title.to_sym].nil?
        puts "That movie doesn't exist!"
      else
        movies.delete(title)
        movies.each do |movie, rating|
          puts "#{movie}: #{rating}"
        end
      end
      
    else puts "Error!"
    end