From 1b12d08a0f8489f0f3970f6d5e40ed119127c856 Mon Sep 17 00:00:00 2001
From: hoffm <m@hof.fm>
Date: Wed, 20 Feb 2013 16:15:59 -0500
Subject: Backport #9347 to rails 3.2

---
 actionpack/CHANGELOG.md                             | 14 ++++++++++++++
 actionpack/lib/action_view/helpers/number_helper.rb |  2 +-
 actionpack/test/template/number_helper_test.rb      |  5 +++++
 3 files changed, 20 insertions(+), 1 deletion(-)

diff --git a/actionpack/CHANGELOG.md b/actionpack/CHANGELOG.md
index 80c0def5b3..8c7e3327f3 100644
--- a/actionpack/CHANGELOG.md
+++ b/actionpack/CHANGELOG.md
@@ -1,5 +1,19 @@
 ## unreleased ##
 
+*   `ActiveSupport::NumberHelper#number_to_human` returns the number unaltered when
+    the units hash does not contain the needed key, e.g. when the number provided is less
+    than the largest key proivided.
+
+    Examples:
+
+        number_to_human(123, :units => {}) # => 123
+        number_to_human(123, :units => {:thousand => 'k'}) # => 123
+
+    Fixes #9269.
+    Backport #9347.
+
+    *Michael Hoffman*
+
 *   Include I18n locale fallbacks in view lookup.
     Fixes GH#3512.
 
diff --git a/actionpack/lib/action_view/helpers/number_helper.rb b/actionpack/lib/action_view/helpers/number_helper.rb
index 4519230fda..ad86d13456 100644
--- a/actionpack/lib/action_view/helpers/number_helper.rb
+++ b/actionpack/lib/action_view/helpers/number_helper.rb
@@ -593,7 +593,7 @@ module ActionView
 
         unit = case units
         when Hash
-          units[DECIMAL_UNITS[display_exponent]]
+          units[DECIMAL_UNITS[display_exponent]] || ''
         when String, Symbol
           I18n.translate(:"#{units}.#{DECIMAL_UNITS[display_exponent]}", :locale => options[:locale], :count => number.to_i)
         else
diff --git a/actionpack/test/template/number_helper_test.rb b/actionpack/test/template/number_helper_test.rb
index 8d679aac1d..37ce3cf6b6 100644
--- a/actionpack/test/template/number_helper_test.rb
+++ b/actionpack/test/template/number_helper_test.rb
@@ -251,6 +251,11 @@ class NumberHelperTest < ActionView::TestCase
     assert_equal '4.5  tens', number_to_human(45, :units => {:unit => "", :ten => ' tens   '})
   end
 
+  def test_number_to_human_with_custom_units_that_are_missing_the_needed_key
+    assert_equal '123', number_to_human(123, :units => {:thousand => 'k'})
+    assert_equal '123', number_to_human(123, :units => {})
+  end
+
   def test_number_to_human_with_custom_format
     assert_equal '123 times Thousand', number_to_human(123456, :format => "%n times %u")
     volume = {:unit => "ml", :thousand => "lt", :million => "m3"}
-- 
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