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-rw-r--r--actionpack/lib/action_dispatch/routing/route_set.rb2
1 files changed, 2 insertions, 0 deletions
diff --git a/actionpack/lib/action_dispatch/routing/route_set.rb b/actionpack/lib/action_dispatch/routing/route_set.rb
index 24f9981f4b..01a068a9f2 100644
--- a/actionpack/lib/action_dispatch/routing/route_set.rb
+++ b/actionpack/lib/action_dispatch/routing/route_set.rb
@@ -512,6 +512,8 @@ module ActionDispatch
end
dispatcher = route.app
+ dispatcher = dispatcher.app while dispatcher.is_a?(Mapper::Constraints)
+
if dispatcher.is_a?(Dispatcher) && dispatcher.controller(params, false)
dispatcher.prepare_params!(params)
return params