Ticket #8746: bigdecimal_to_yaml_in_correct_path.diff.txt

Index: test/core_ext/bigdecimal.rb
===================================================================
--- test/core_ext/bigdecimal.rb (revision 0)
+++ test/core_ext/bigdecimal.rb (revision 0)
@@ -0,0 +1,9 @@
+require 'abstract_unit'
+
+class BigDecimalTest < Test::Unit::TestCase 
+  def test_to_yaml
+    assert_equal("--- 100000.30020320320000000000000000000000000000001\n", BigDecimal.new('100000.30020320320000000000000000000000000000001').to_yaml)
+    assert_equal("--- .Inf\n", BigDecimal.new('Infinity').to_yaml)
+    assert_equal("--- .NaN\n", BigDecimal.new('NaN').to_yaml)
+  end 
+end
\ No newline at end of file
Index: lib/active_support/core_ext/bigdecimal/conversions.rb
===================================================================
--- lib/active_support/core_ext/bigdecimal/conversions.rb       (revision 8858)
+++ lib/active_support/core_ext/bigdecimal/conversions.rb       (working copy)
@@ -1,3 +1,5 @@
+require 'yaml'
+
 class BigDecimal #:nodoc:
   alias :_original_to_s :to_s
   def to_s(format="F")
@@ -3,3 +5,23 @@
     _original_to_s(format)
   end
+  
+  def to_yaml( opts = {} ) 
+    YAML::quick_emit( nil, opts ) do |out| 
+      # This emits the number without any scientific notation. 
+      # I prefer it to using self.to_f.to_s, which would lose precision. 
+      # 
+      # Note that YAML allows that when reconsituting floats 
+      # to native types, some precision may get lost. 
+      # There is no full precision real YAML tag that I am aware of. 
+      str = self.to_s 
+      if str == "Infinity" 
+        str = ".Inf" 
+      elsif str == "-Infinity" 
+        str = "-.Inf" 
+      elsif str == "NaN" 
+        str = ".NaN" 
+      end 
+      out.scalar( "tag:yaml.org,2002:float", str, :plain ) 
+    end 
+  end
 end