https://git.ruby-lang.org/ruby.git/commit/?id=b8084b5cb4

From b8084b5cb4e20d463938b518dd12f91290c3fb1a Mon Sep 17 00:00:00 2001
From: Sutou Kouhei <kou@c...>
Date: Sun, 17 May 2020 11:51:06 +0900
Subject: [ruby/csv] Fix a bug that write_nil_value or write_empty_value don't
 work with non String

GitHub: fix GH-123

Reported by asm256. Thanks!!!

https://github.com/ruby/csv/commit/b4492139be

diff --git a/lib/csv/fields_converter.rb b/lib/csv/fields_converter.rb
index a751c9e..178ffb3 100644
--- a/lib/csv/fields_converter.rb
+++ b/lib/csv/fields_converter.rb
@@ -50,7 +50,7 @@ class CSV https://github.com/ruby/ruby/blob/trunk/lib/csv/fields_converter.rb#L50
       fields.collect.with_index do |field, index|
         if field.nil?
           field = @nil_value
-        elsif field.empty?
+        elsif field.is_a?(String) and field.empty?
           field = @empty_value unless @empty_value_is_empty_string
         end
         @converters.each do |converter|
diff --git a/test/csv/write/test_converters.rb b/test/csv/write/test_converters.rb
index a93b104..0e0080b 100644
--- a/test/csv/write/test_converters.rb
+++ b/test/csv/write/test_converters.rb
@@ -20,14 +20,14 @@ module TestCSVWriteConverters https://github.com/ruby/ruby/blob/trunk/test/csv/write/test_converters.rb#L20
   end
 
   def test_nil_value
-    assert_equal(%Q[a,NaN,c\n],
-                 generate_line(["a", nil, "c"],
+    assert_equal(%Q[a,NaN,29\n],
+                 generate_line(["a", nil, 29],
                                write_nil_value: "NaN"))
   end
 
   def test_empty_value
-    assert_equal(%Q[a,,c\n],
-                 generate_line(["a", "", "c"],
+    assert_equal(%Q[a,,29\n],
+                 generate_line(["a", "", 29],
                                write_empty_value: nil))
   end
 end
-- 
cgit v0.10.2


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