Showing Full Country Name in Global Autocomplete

How can I fetch a full country name in the search.json.jbuilder. I am using the Country_select gem and autocomplete results is showing only a country short code like GB for United Kingdom.

Here is my code in the search.json.jbuilder:
json.movies do
  json.array!(@movies) do |movie|
    json.name movie.title.titleize + " " + "in" + " " + movie.country
    json.url movie_path(movie)
  end

movie.rb
 def country_name
    country = self.country
    ISO3166::Country[country]
   end

Thanks