add NilClass#to_d

ruby · Apr 9, 2018 · c033c71 · c033c71
1 parent d8e1446
commit c033c71
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diff --git a/lib/bigdecimal/util.rb b/lib/bigdecimal/util.rb
@@ -132,3 +132,20 @@ def to_d(precision)
     BigDecimal(self, precision)
   end
 end
+
+
+class NilClass
+  # call-seq:
+  #     nil.to_d -> bigdecimal
+  #
+  # Returns nil represented as a BigDecimal.
+  #
+  #     require 'bigdecimal'
+  #     require 'bigdecimal/util'
+  #
+  #     nil.to_d   # => 0.0
+  #
+  def to_d
+    BigDecimal(0)
+  end
+end
diff --git a/test/test_bigdecimal_util.rb b/test/test_bigdecimal_util.rb
@@ -57,4 +57,8 @@ def test_invalid_String_to_d
     assert_equal("invalid".to_d, BigDecimal('0.0'))
   end
 
+  def test_Nil_to_d
+    assert_equal(nil.to_d, BigDecimal('0.0'))
+  end
+
 end