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-rw-r--r--actionpack/lib/action_dispatch/routing/mapper.rb2
1 files changed, 1 insertions, 1 deletions
diff --git a/actionpack/lib/action_dispatch/routing/mapper.rb b/actionpack/lib/action_dispatch/routing/mapper.rb
index 0cb02c5b80..189da138d8 100644
--- a/actionpack/lib/action_dispatch/routing/mapper.rb
+++ b/actionpack/lib/action_dispatch/routing/mapper.rb
@@ -349,7 +349,7 @@ module ActionDispatch
options = args.last.is_a?(Hash) ? args.pop : {}
path = args.shift || block
- path_proc = path.is_a?(Proc) ? path : proc { |params| params.empty? ? path : (path % params) }
+ path_proc = path.is_a?(Proc) ? path : proc { |params| (params.empty? || !path.match(/%{\w*}/)) ? path : (path % params) }
status = options[:status] || 301
lambda do |env|