Changed sort_natural filter to use casecmp. Strings only.

lib/liquid/standardfilters.rb

@@ -127,19 +127,12 @@ module Liquid
     def sort_natural(input, property = nil)
       ary = InputIterator.new(input)
 
-      # Quick function that returns the downcased object if it has a downcase,
-      # otherwise it returns the object itself.
-      insensitive = lambda do |obj|
-        obj = obj.downcase if obj.respond_to? :downcase
-        obj
-      end
-
       if property.nil?
-        ary.sort {|a,b| insensitive.call(a) <=> insensitive.call(b) }
+        ary.sort {|a,b| a.casecmp b }
       elsif ary.first.respond_to?(:[]) && !ary.first[property].nil?
-        ary.sort {|a,b| insensitive.call(a[property]) <=> insensitive.call(b[property]) }
+        ary.sort {|a,b| a[property].casecmp b[property] }
       elsif ary.first.respond_to?(property)
-        ary.sort {|a,b| insensitive.call(a.send(property)) <=> insensitive.call(b.send(property)) }
+        ary.sort {|a,b| a.send(property).casecmp b.send(property) }
       end
     end
 

test/integration/filter_test.rb

@@ -84,16 +84,13 @@ class FiltersTest < Minitest::Test
   end
 
   def test_sort_natural
-    @context['value'] = 3
-    @context['numbers'] = [2,1,4,3]
     @context['words'] = ['case', 'Assert', 'Insensitive']
     # This specific syntax forces hashes to have string keys. Colons won't work.
     @context['hashes'] = [{ 'a' => 'A'}, { 'a' => 'b'}, { 'a' => 'C' }]
     @context['objects'] = [TestObject.new('A'), TestObject.new('b'), TestObject.new('C')]
 
-    assert_equal [1,2,3,4], Variable.new("numbers | sort_natural").render(@context)
+    # Test strings
     assert_equal ['Assert', 'case', 'Insensitive'], Variable.new("words | sort_natural").render(@context)
-    assert_equal [3], Variable.new("value | sort_natural").render(@context)
 
     # Test hashes
     sorted = Variable.new("hashes | sort_natural: 'a'").render(@context)
@@ -164,7 +161,7 @@ class FiltersInTemplate < Minitest::Test
   end
 end # FiltersTest
 
-# Simple object that may be passed into a filter.
+# Simple object that gmay be passed into a filter.
 # Note to test subjects: do not smuggle test objects out of the testing area.
 class TestObject
   attr_accessor :a