1 files changed, 6 insertions, 0 deletions
diff --git a/actionpack/lib/action_dispatch/routing/mapper.rb b/actionpack/lib/action_dispatch/routing/mapper.rb
index e2cf75da3a..73b4864e45 100644
--- a/actionpack/lib/action_dispatch/routing/mapper.rb
+++ b/actionpack/lib/action_dispatch/routing/mapper.rb
@@ -1562,6 +1562,12 @@ module ActionDispatch
             options  = path
             path, to = options.find { |name, _value| name.is_a?(String) }
 
+            if path.nil?
+              ActiveSupport::Deprecation.warn 'Omitting the route path is deprecated. '\
+                'Specify the path with a String or a Symbol instead.'
+              path = ''
+            end
+
             case to
             when Symbol
               options[:action] = to