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-rw-r--r--actionpack/lib/action_dispatch/journey/formatter.rb4
1 files changed, 3 insertions, 1 deletions
diff --git a/actionpack/lib/action_dispatch/journey/formatter.rb b/actionpack/lib/action_dispatch/journey/formatter.rb
index 326f4e52f9..0f04839d9b 100644
--- a/actionpack/lib/action_dispatch/journey/formatter.rb
+++ b/actionpack/lib/action_dispatch/journey/formatter.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
require "action_controller/metal/exceptions"
module ActionDispatch
@@ -48,7 +50,7 @@ module ActionDispatch
unmatched_keys = (missing_keys || []) & constraints.keys
missing_keys = (missing_keys || []) - unmatched_keys
- message = "No route matches #{Hash[constraints.sort_by { |k, v| k.to_s }].inspect}"
+ message = "No route matches #{Hash[constraints.sort_by { |k, v| k.to_s }].inspect}".dup
message << ", missing required keys: #{missing_keys.sort.inspect}" if missing_keys && !missing_keys.empty?
message << ", possible unmatched constraints: #{unmatched_keys.sort.inspect}" if unmatched_keys && !unmatched_keys.empty?