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-rw-r--r--actionpack/lib/action_controller/routing/optimisations.rb2
1 files changed, 1 insertions, 1 deletions
diff --git a/actionpack/lib/action_controller/routing/optimisations.rb b/actionpack/lib/action_controller/routing/optimisations.rb
index 4522ebcb1a..714cf97861 100644
--- a/actionpack/lib/action_controller/routing/optimisations.rb
+++ b/actionpack/lib/action_controller/routing/optimisations.rb
@@ -65,7 +65,7 @@ module ActionController
# rather than triggering the expensive logic in +url_for+.
class PositionalArguments < Optimiser
def guard_conditions
- number_of_arguments = route.segment_keys.size
+ number_of_arguments = route.required_segment_keys.size
# if they're using foo_url(:id=>2) it's one
# argument, but we don't want to generate /foos/id2
if number_of_arguments == 1