change

  def self.add_movie_from_tmdb(id)
      movie_release = Tmdb::Movie.releases(id)[0]
      movie_detail = (Tmdb::Movie.detail(id))
      Movie.create(:title => movie_detail['title'],
                   :rating => movie_release['certification'],
                   :description => movie_detail['overview'],
                   :release_date => movie_release['release_date'])
      #Movie.create!(:title => movie_detail['title'],
      #              :rating => movie_release['certification'],
      #              :description => movie_detail['overview'],
      #              :release_date => movie_release['release_date'])
  end