Prevent error on transliterate with frozen strings.

ActiveSupport::Inflector.transliterate mutates strings by changing encodings. Prior to this commit passing a frozen string would raise a `FrozenError`. This change duplicates the internal string, if frozen, before transliterating.

1 files changed, 1 insertions, 0 deletions

diff --git a/activesupport/lib/active_support/inflector/transliterate.rb b/activesupport/lib/active_support/inflector/transliterate.rb
index 3ba2d93ed8..1899a1212d 100644
--- a/activesupport/lib/active_support/inflector/transliterate.rb
+++ b/activesupport/lib/active_support/inflector/transliterate.rb
@@ -60,6 +60,7 @@ module ActiveSupport
     # Transliteration is restricted to UTF-8, US-ASCII and GB18030 strings
     # Other encodings will raise an ArgumentError.
     def transliterate(string, replacement = "?", locale: nil)
+      string = string.dup if string.frozen?
       raise ArgumentError, "Can only transliterate strings. Received #{string.class.name}" unless string.is_a?(String)
 
       allowed_encodings = [Encoding::UTF_8, Encoding::US_ASCII, Encoding::GB18030]