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-rw-r--r--actionpack/lib/action_dispatch/routing/mapper.rb4
1 files changed, 4 insertions, 0 deletions
diff --git a/actionpack/lib/action_dispatch/routing/mapper.rb b/actionpack/lib/action_dispatch/routing/mapper.rb
index ffd5b83ad3..faa93ecc17 100644
--- a/actionpack/lib/action_dispatch/routing/mapper.rb
+++ b/actionpack/lib/action_dispatch/routing/mapper.rb
@@ -137,6 +137,10 @@ module ActionDispatch
@conditions = Hash[conditions]
@defaults = formats[:defaults].merge(@defaults).merge(normalize_defaults(options))
+ if path_params.include?(:action) && !@requirements.key?(:action)
+ @defaults[:action] ||= 'index'
+ end
+
@required_defaults = (split_options[:required_defaults] || []).map(&:first)
end