Changed 0.blank? to false rather than true since it violates everyone's expectation of blankness. Closes #2518, Closes #2705.

git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@2849 5ecf4fe2-1ee6-0310-87b1-e25e094e27de

activesupport/CHANGELOG

@@ -1,5 +1,7 @@
 *SVN*
 
+* Changed 0.blank? to false rather than true since it violates everyone's expectation of blankness.  #2518, #2705 [rails@jeffcole.net]
+
 * When loading classes using const_missing, raise a NameError if and only if the file we tried to load was not present. [Nicholas Seckar]
 
 * Added petabytes and exebytes to numeric extensions #2397 [timct@mac.com]

activesupport/lib/active_support/core_ext/blank.rb

@@ -30,7 +30,3 @@ class String #:nodoc:
     empty? || strip.empty?
   end
 end
-
-class Numeric #:nodoc:
-  alias_method :blank?, :zero?
-end

activesupport/lib/active_support/core_ext/object_and_class.rb

@@ -14,14 +14,12 @@ class Object #:nodoc:
     subclasses
   end
 
-  # "", "   ", nil, and 0 are all blank
+  # "", "   ", nil, [], and {} are blank
   def blank?
     if respond_to?(:empty?) && respond_to?(:strip)
-      strip.empty?
-    elsif respond_to? :empty?
+      empty? or strip.empty?
+    elsif respond_to?(:empty?)
       empty?
-    elsif respond_to? :zero?
-      zero?
     else
       !self
     end

activesupport/test/core_ext/blank_test.rb

@@ -0,0 +1,13 @@
+require 'test/unit'
+require File.dirname(__FILE__) + '/../../lib/active_support/core_ext/object_and_class'
+require File.dirname(__FILE__) + '/../../lib/active_support/core_ext/blank'
+
+class BlankTest < Test::Unit::TestCase
+  BLANK = [nil, false, '', '   ', "  \n\t  \r ", [], {}]
+  NOT   = [true, 0, 1, 'a', [nil], { nil => 0 }]
+
+  def test_blank
+    BLANK.each { |v| assert v.blank?  }
+    NOT.each   { |v| assert !v.blank? }
+  end
+end