Allow Float#round to take a precision argument. Closes #8626 [norbert]

git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@7401 5ecf4fe2-1ee6-0310-87b1-e25e094e27de

1 files changed, 22 insertions, 0 deletions

diff --git a/activesupport/lib/active_support/core_ext/float/rounding.rb b/activesupport/lib/active_support/core_ext/float/rounding.rb
new file mode 100644
index 0000000000..989b1f8f80
--- /dev/null
+++ b/activesupport/lib/active_support/core_ext/float/rounding.rb
@@ -0,0 +1,22 @@
+module ActiveSupport #:nodoc:
+  module CoreExtensions #:nodoc:
+    module Float #:nodoc:
+      module Rounding
+        def self.included(base) #:nodoc:
+          base.send(:alias_method, :round_without_precision, :round)
+          base.send(:alias_method, :round, :round_with_precision)
+        end
+
+        # Rounds the float with the specified precision.
+        #
+        #   x = 1.337
+        #   x.round    # => 1
+        #   x.round(1) # => 1.3
+        #   x.round(2) # => 1.34
+        def round_with_precision(precision = nil)
+          precision.nil? ? round_without_precision : (self * (10 ** precision)).round / (10 ** precision).to_f
+        end
+      end
+    end
+  end
+end