From 8c81491f85693fe6327453f92c0dd4d323fe3869 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Wojciech=20Wn=C4=99trzak?= <w.wnetrzak@gmail.com>
Date: Thu, 10 Mar 2011 12:59:51 +0100
Subject: [PATCH] added rounding extension for integer to be consistent with ruby 1.9

---
 .../lib/active_support/core_ext/integer.rb         |    1 +
 .../active_support/core_ext/integer/rounding.rb    |   20 +++++++++++++++++++
 activesupport/test/core_ext/integer_ext_test.rb    |   21 ++++++++++++++++++++
 3 files changed, 42 insertions(+), 0 deletions(-)
 create mode 100644 activesupport/lib/active_support/core_ext/integer/rounding.rb

diff --git a/activesupport/lib/active_support/core_ext/integer.rb b/activesupport/lib/active_support/core_ext/integer.rb
index a44a1b4..a7593d5 100644
--- a/activesupport/lib/active_support/core_ext/integer.rb
+++ b/activesupport/lib/active_support/core_ext/integer.rb
@@ -1,3 +1,4 @@
 require 'active_support/core_ext/integer/multiple'
 require 'active_support/core_ext/integer/inflections'
 require 'active_support/core_ext/integer/time'
+require 'active_support/core_ext/integer/rounding'
diff --git a/activesupport/lib/active_support/core_ext/integer/rounding.rb b/activesupport/lib/active_support/core_ext/integer/rounding.rb
new file mode 100644
index 0000000..998eeba
--- /dev/null
+++ b/activesupport/lib/active_support/core_ext/integer/rounding.rb
@@ -0,0 +1,20 @@
+class Integer
+  alias precisionless_round round
+  private :precisionless_round
+
+  # Rounds the integer with the specified precision.
+  #
+  #   x = 1233
+  #   x.round     # => 1233
+  #   x.round(1)  # => 1233
+  #   x.round(-1) # => 1230
+  #   x.round(-5) # => 0
+  def round(precision = nil)
+    if precision
+      magnitude = 10 ** precision
+      ((self * magnitude).round / magnitude).to_i
+    else
+      precisionless_round
+    end
+  end
+end if RUBY_VERSION < '1.9'
diff --git a/activesupport/test/core_ext/integer_ext_test.rb b/activesupport/test/core_ext/integer_ext_test.rb
index fe8c7eb..161383b 100644
--- a/activesupport/test/core_ext/integer_ext_test.rb
+++ b/activesupport/test/core_ext/integer_ext_test.rb
@@ -24,4 +24,25 @@ class IntegerExtTest < Test::Unit::TestCase
     assert_equal '8th', 8.ordinalize
     1000000000000000000000000000000000000000000000000000000000000000000000.ordinalize
   end
+
+  def test_round_for_positive_number
+    assert_equal 1, 1.round
+    assert_equal 2, 2.round(1)
+  end
+
+  def test_round_for_negative_number
+    assert_equal( -1, -1.round )
+    assert_equal( -5, -5.round(1) )
+  end
+
+  def test_round_with_negative_precision
+    assert_equal 123460,  123456.round(-1)
+    assert_equal 123500,  123456.round(-2)
+    assert_equal -123500, -123456.round(-2)
+  end
+
+  def test_not_changing_class_after_round
+    assert_equal Fixnum, 123456.round(1).class
+    assert_equal Fixnum, 123456.round(-1).class
+  end
 end
-- 
1.7.1.1