From d03c4ae8e860e20c27f46cf25ee83d2bbba14906 Mon Sep 17 00:00:00 2001
From: Ismael Celis <ismaelct@gmail.com>
Date: Wed, 30 Mar 2016 01:57:21 -0300
Subject: [PATCH] Allow Utils.to_number to work with anything that responds to
 #to_number

---
 lib/liquid/utils.rb                      |  6 +++++-
 test/integration/standard_filter_test.rb | 12 ++++++++++++
 2 files changed, 17 insertions(+), 1 deletion(-)

diff --git a/lib/liquid/utils.rb b/lib/liquid/utils.rb
index 4e18138..f8f5d71 100644
--- a/lib/liquid/utils.rb
+++ b/lib/liquid/utils.rb
@@ -52,7 +52,11 @@ module Liquid
       when String
         (obj.strip =~ /\A\d+\.\d+\z/) ? BigDecimal.new(obj) : obj.to_i
       else
-        0
+        if obj.respond_to?(:to_number)
+          obj.to_number
+        else
+          0
+        end
       end
     end
 
diff --git a/test/integration/standard_filter_test.rb b/test/integration/standard_filter_test.rb
index eb88384..38a43b3 100644
--- a/test/integration/standard_filter_test.rb
+++ b/test/integration/standard_filter_test.rb
@@ -41,6 +41,16 @@ class TestEnumerable < Liquid::Drop
   end
 end
 
+class NumberLikeThing < Liquid::Drop
+  def initialize(amount)
+    @amount = amount
+  end
+
+  def to_number
+    @amount
+  end
+end
+
 class StandardFiltersTest < Minitest::Test
   include Liquid
 
@@ -391,6 +401,8 @@ class StandardFiltersTest < Minitest::Test
     assert_raises(Liquid::ZeroDivisionError) do
       assert_template_result "4", "{{ 1 | modulo: 0 }}"
     end
+
+    assert_template_result "5", "{{ price | divided_by:2 }}", 'price' => NumberLikeThing.new(10)
   end
 
   def test_modulo