Adds the ability to ignore unknown fields on parse

This adds the ability for the MRI Ruby library to optionally pass in a
ignore_unknown_fields option when decoding JSON. The functionality was
added upstream in upb, this change exposes that option.

1 files changed, 13 insertions, 0 deletions

diff --git a/ruby/tests/basic.rb b/ruby/tests/basic.rb
index 77dfead40..5e17bef65 100644
--- a/ruby/tests/basic.rb
+++ b/ruby/tests/basic.rb
@@ -254,6 +254,19 @@ module BasicTest
                     "b" => TestMessage2.new(:foo => 2)}
     end
 
+    def test_protobuf_decode_json_ignore_unknown_fields
+      m = TestMessage.decode_json({
+        optional_string: "foo",
+        not_in_message: "some_value"
+      }.to_json, { ignore_unknown_fields: true })
+
+      assert_equal m.optional_string, "foo"
+      e = assert_raise Google::Protobuf::ParseError do
+        TestMessage.decode_json({ not_in_message: "some_value" }.to_json)
+      end
+      assert_match(/No such field: not_in_message/, e.message)
+    end
+
     def test_to_h
       m = TestMessage.new(:optional_bool => true, :optional_double => -10.100001, :optional_string => 'foo', :repeated_string => ['bar1', 'bar2'], :repeated_msg => [TestMessage2.new(:foo => 100)])
       expected_result = {