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-rw-r--r--activesupport/lib/active_support/notifications/instrumenter.rb3
1 files changed, 2 insertions, 1 deletions
diff --git a/activesupport/lib/active_support/notifications/instrumenter.rb b/activesupport/lib/active_support/notifications/instrumenter.rb
index 0c9a729ce5..3a244b34b5 100644
--- a/activesupport/lib/active_support/notifications/instrumenter.rb
+++ b/activesupport/lib/active_support/notifications/instrumenter.rb
@@ -54,10 +54,11 @@ module ActiveSupport
@transaction_id = transaction_id
@end = ending
@children = []
+ @duration = nil
end
def duration
- 1000.0 * (self.end - time)
+ @duration ||= 1000.0 * (self.end - time)
end
def <<(event)