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I'm trying to sort an array of objects based upon different attributes. Some of those attributes I would like to sort in ascending order and some in descending order. I have been able to sort by ascending or descending but have been unable to combine the two. Here is the simple class I am working with: class Dog attr_reader :name, :gender DOGS = [] def initialize(name, gender) @name = name @gender = gender DOGS << self end def self.all DOGS end def self.sort_all_by_gender_then_name self.all.sort_by { |d| [d.gender, d.name] } end end I can then instantiate some dogs to be sorted later. @rover = Dog.new("Rover", "Male") @max = Dog.new("Max", "Male") @fluffy = Dog.new("Fluffy", "Female") @cocoa = Dog.new("Cocoa", "Female") I can then use the sort_all_by_gender_then_name method. Dog.sort_all_by_gender_then_name => [@cocoa, @fluffy, @max, @rover] The array it returns includes females first, then males, all sorted by name in ascending order. But what if I want to have gender be descending, and then name ascending, so that it would be males first and then sorted by name ascending. In this case: => [@max, @rover, @cocoa, @fluffy] Or, if I wanted it by gender ascending, but name descending: => [@fluffy, @cocoa, @rover, @max] When sorting numerical values, you can prepend a - to make it sort in reverse. However, I have been unable to find a way to do this with strings. Any help or ideas would be appreciated. Thanks.

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