1 files changed, 27 insertions, 0 deletions
diff --git a/ext/json/lib/json/add/rational.rb b/ext/json/lib/json/add/rational.rb
new file mode 100644
index 0000000000..ee39c20e8d
--- /dev/null
+++ b/ext/json/lib/json/add/rational.rb
@@ -0,0 +1,27 @@
+unless defined?(::JSON::JSON_LOADED) and ::JSON::JSON_LOADED
+  require 'json'
+end
+defined?(::Rational) or require 'rational'
+
+class Rational
+  # Deserializes JSON string by converting numerator value <tt>n</tt>,
+  # denominator value <tt>d</tt>, to a Rational object.
+  def self.json_create(object)
+    Rational(object['n'], object['d'])
+  end
+
+  # Returns a hash, that will be turned into a JSON object and represent this
+  # object.
+  def as_json(*)
+    {
+      JSON.create_id => self.class.name,
+      'n'            => numerator,
+      'd'            => denominator,
+    }
+  end
+
+  # Stores class name (Rational) along with numerator value <tt>n</tt> and denominator value <tt>d</tt> as JSON string
+  def to_json(*)
+    as_json.to_json
+  end
+end