allow non-String default params in the router.

Closes #9435.

Skip valid encoding checks for non-String parameters that come
from the matched route's defaults.

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 ff86f87d49..ca31b5e02e 100644
--- a/actionpack/lib/action_dispatch/routing/route_set.rb
+++ b/actionpack/lib/action_dispatch/routing/route_set.rb
@@ -31,6 +31,8 @@ module ActionDispatch
           # If any of the path parameters has a invalid encoding then
           # raise since it's likely to trigger errors further on.
           params.each do |key, value|
+            next unless value.respond_to?(:valid_encoding?)
+
             unless value.valid_encoding?
               raise ActionController::BadRequest, "Invalid parameter: #{key} => #{value}"
             end