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-rw-r--r--activesupport/lib/active_support/duration/iso8601_serializer.rb4
-rw-r--r--activesupport/test/core_ext/duration_test.rb1
2 files changed, 4 insertions, 1 deletions
diff --git a/activesupport/lib/active_support/duration/iso8601_serializer.rb b/activesupport/lib/active_support/duration/iso8601_serializer.rb
index 05c6a083a9..eb8136e208 100644
--- a/activesupport/lib/active_support/duration/iso8601_serializer.rb
+++ b/activesupport/lib/active_support/duration/iso8601_serializer.rb
@@ -12,8 +12,10 @@ module ActiveSupport
# Builds and returns output string.
def serialize
- output = 'P'
parts, sign = normalize
+ return "PT0S".freeze if parts.empty?
+
+ output = 'P'
output << "#{parts[:years]}Y" if parts.key?(:years)
output << "#{parts[:months]}M" if parts.key?(:months)
output << "#{parts[:weeks]}W" if parts.key?(:weeks)
diff --git a/activesupport/test/core_ext/duration_test.rb b/activesupport/test/core_ext/duration_test.rb
index 502e2811fa..a24915dfef 100644
--- a/activesupport/test/core_ext/duration_test.rb
+++ b/activesupport/test/core_ext/duration_test.rb
@@ -279,6 +279,7 @@ class DurationTest < ActiveSupport::TestCase
['PT1S', 1.second ],
['PT1.4S', (1.4).seconds ],
['P1Y1M1DT1H', 1.year + 1.month + 1.day + 1.hour],
+ ['PT0S', 0.minutes ],
]
expectations.each do |expected_output, duration|
assert_equal expected_output, duration.iso8601, expected_output.inspect