Stuck on Ruby Core Extra Credit - Movie Class

Question

Hello, I decided to try my luck with the extra credit under the Ruby Core section of the Ruby Foundations track which is as follows:

Now that we have many of the basic classes of Ruby in our toolbox, try writing a program that uses modules and classes to create a movie class. Each movie should have a title and rating. Finally, implement comparison of movies using the Comparable module.

I'm starting out with a simple movie class which takes in the title and rankings of a movie and sends that to a hash. The issue I am having is that when I display the hash, it only displays the second movie and not the first one and the second one. I believe this most likely has to do with some sort of variable scope but I cannot seem to figure it out. Any help is appreciated. Thank you!

class Movies
  attr_accessor :title, :rating

  def initialize
    @@movies = {}
  end

  def add_movies
    @@movies[@title] = @rating
  end

  def self.display
    puts @@movies
  end
end


movie1 = Movies.new
movie1.title = "Fargo"
movie1.rating = "10"
movie1.add_movies


movie2 = Movies.new
movie2.title = "Transformers"
movie2.rating = "1"
movie2.add_movies

Movies.display

Answer 1 · 2014-07-01T23:54:28Z

July 1, 2014 11:54pm

The reason this is happening is because you are basically making 2 movie lists and only displaying the last one.

class Movies
  attr_accessor :title, :rating

  def initialize
    @@movies = {}
  end

  def add_movies
    @@movies[@title] = @rating
  end

  def self.display
    puts @@movies
  end
end


movie1 = Movies.new #Creates a new Movie object called movie1
movie1.title = "Fargo" #Adding movie data
movie1.rating = "10"   #Adding movie data
movie1.add_movies    #Adding movie data

# Movies.display here would show you {"Fargo"=>"10"}

movie2 = Movies.new #Here is the problem, you are creating a second movie object that the new movie will be placed into
movie2.title = "Transformers"
movie2.rating = "1"
movie2.add_movies

Movies.display             # This produces only {"Transformers"=>"1"}

------------------------------------------------------------------------------------
#Cleaner version that does what you want it to
movies = Movies.new

movies.title = "Fargo"
movies.rating = "10"
movies.add_movies

movies.title = "Transformers"
movies.rating = "1"
movies.add_movies

Movies.display

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Richard Luick

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Stuck on Ruby Core Extra Credit - Movie Class

1 Answer

Jamie McCaw

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Richard Luick

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