task 5

mov_col.rb

load 'movie.rb'

class MovieCollection
    attr_accessor :all 
  
    def read(unit)
        @all = File.readlines(unit).map{|line| Movie.new( *line.chomp.split("|") ) }
    end

    def sort_by(field)
        begin
            return @all.sort_by(&field)
        rescue
            return "not an option"
        end
    end
    
    def filter(field_val)
        field_val = field_val.to_a.flatten
        begin
            return @all.select{|u| u.send(field_val[0]).include?(field_val[1]) }
        rescue
            return "not an option"
        end
    end

    def stats(field)
        begin
            return @all.flat_map(&field)
                       .each_with_object(Hash.new(0)){|val, stats| stats[val] += 1}
                       .sort    
        rescue
            "not an option"
        end
    end
end